[maven-release-plugin] prepare release ebean-11.24.1

* #1519 - Memory leak when using @Cache(enableQueryCache=true)

* #1519 - Memory leak when using @Cache(enableQueryCache=true)

Remove unused TransactionEventBeans

howto-test.md

@@ -151,3 +151,18 @@ In `InsertHandler.getPstmt` the `meta.getIdentityDbColumns()` contains
 TODO: not yet tested
 
 
+
+'hana' platform
+--------------------
+
+Requires an installed SAP HANA server - e.g. https://store.docker.com/images/sap-hana-express-edition
+
+- Create a user `EBEAN_TEST` with password `Eb3an_test` in the tenant database `HXE`
+- Adjust the connection string and/or username in `ebean.properties`
+  
+run: `mvn clean test -Ddatasource.default=hana`
+
+Current status: PASS
+Tests run: 2486, Failures: 0, Errors: 0, Skipped: 84
+
+

pom.xml

@@ -9,7 +9,7 @@
 
   <groupId>io.ebean</groupId>
   <artifactId>ebean</artifactId>
-  <version>11.22.1</version>
+  <version>11.24.1</version>
   <packaging>jar</packaging>
 
   <name>ebean</name>
@@ -22,7 +22,7 @@
 
   <scm>
     <developerConnection>scm:git:git@github.com:ebean-orm/ebean.git</developerConnection>
-    <tag>ebean-11.22.1</tag>
+    <tag>ebean-11.24.1</tag>
   </scm>
 
   <profiles>
@@ -117,13 +117,13 @@
     <dependency>
       <groupId>io.ebean</groupId>
       <artifactId>ebean-annotation</artifactId>
-      <version>4.2</version>
+      <version>4.3</version>
     </dependency>
 
     <dependency>
-      <groupId>org.avaje</groupId>
-      <artifactId>avaje-datasource</artifactId>
-      <version>3.2.2</version>
+      <groupId>io.ebean</groupId>
+      <artifactId>ebean-datasource</artifactId>
+      <version>4.2.1</version>
     </dependency>
 
     <dependency>
@@ -229,7 +229,7 @@
     <dependency>
       <groupId>io.ebean</groupId>
       <artifactId>ebean-agent</artifactId>
-      <version>11.11.1</version>
+      <version>11.24.1</version>
       <scope>test</scope>
     </dependency>
 
@@ -271,6 +271,13 @@
       <scope>test</scope>
     </dependency>
 
+    <dependency>
+      <groupId>com.sap.cloud.db.jdbc</groupId>
+      <artifactId>ngdbc</artifactId>
+      <version>2.3.48</version>
+      <scope>test</scope>
+    </dependency>
+
     <dependency>
       <groupId>org.avaje.composite</groupId>
       <artifactId>avaje-composite-testing</artifactId>
@@ -302,7 +309,7 @@
       <plugin>
         <groupId>io.ebean</groupId>
         <artifactId>ebean-maven-plugin</artifactId>
-        <version>11.11.1</version>
+        <version>11.24.1</version>
         <executions>
           <execution>
             <id>test</id>

src/main/java/io/ebean/Ebean.java

@@ -2,10 +2,12 @@ package io.ebean;
 
 import io.ebean.annotation.TxIsolation;
 import io.ebean.cache.ServerCacheManager;
+import io.ebean.config.BeanNotEnhancedException;
 import io.ebean.config.ServerConfig;
 import io.ebean.plugin.Property;
 import io.ebean.text.csv.CsvReader;
 import io.ebean.text.json.JsonContext;
+import io.ebean.datasource.DataSourceConfigurationException;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -160,6 +162,15 @@ public final class Ebean {
             defaultServer = getWithCreate(defaultName.trim());
           }
         }
+      } catch (BeanNotEnhancedException e) {
+        throw e;
+
+      } catch (DataSourceConfigurationException e) {
+        String msg = "Configuration error creating DataSource for the default EbeanServer." +
+          " This typically means a missing application-test.yml or missing ebean-test-config dependency." +
+          " See https://ebean-orm.github.io/docs/trouble-shooting#datasource";
+        throw new DataSourceConfigurationException(msg, e);
+
       } catch (Throwable e) {
         logger.error("Error trying to create the default EbeanServer", e);
         throw new RuntimeException(e);

src/main/java/io/ebean/ExpressionList.java

@@ -166,6 +166,18 @@ public interface ExpressionList<T> {
    */
   int delete();
 
+  /**
+   * Execute as a delete query deleting the 'root level' beans that match the predicates
+   * in the query.
+   * <p>
+   * Note that if the query includes joins then the generated delete statement may not be
+   * optimal depending on the database platform.
+   * </p>
+   *
+   * @return the number of rows that were deleted.
+   */
+  int delete(Transaction transaction);
+
   /**
    * Execute as a update query.
    *
@@ -174,6 +186,14 @@ public interface ExpressionList<T> {
    */
   int update();
 
+  /**
+   * Execute as a update query with the given transaction.
+   *
+   * @return the number of rows that were updated.
+   * @see UpdateQuery
+   */
+  int update(Transaction transaction);
+
   /**
    * Execute the query iterating over the results.
    *

src/main/java/io/ebean/Model.java

@@ -74,7 +74,6 @@ import javax.persistence.MappedSuperclass;
  *
  * }</pre>
  */
-@MappedSuperclass
 public abstract class Model {
 
   /**

src/main/java/io/ebean/OrderBy.java

@@ -1,9 +1,12 @@
 package io.ebean;
 
+import io.ebean.util.StringHelper;
+
 import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Objects;
 
 /**
  * Represents an Order By for a Query.
@@ -74,6 +77,15 @@ public final class OrderBy<T> implements Serializable {
     return query;
   }
 
+  /**
+   * Add a property with ascending order to this OrderBy.
+   */
+  public Query<T> asc(String propertyName, String collation) {
+
+    list.add(new Property(propertyName, true, collation));
+    return query;
+  }
+
   /**
    * Add a property with descending order to this OrderBy.
    */
@@ -83,6 +95,16 @@ public final class OrderBy<T> implements Serializable {
     return query;
   }
 
+  /**
+   * Add a property with descending order to this OrderBy.
+   */
+  public Query<T> desc(String propertyName, String collation) {
+
+    list.add(new Property(propertyName, false, collation));
+    return query;
+  }
+
+
   /**
    * Return true if the property is known to be contained in the order by clause.
    */
@@ -231,6 +253,8 @@ public final class OrderBy<T> implements Serializable {
 
     private boolean ascending;
 
+    private String collation;
+
     private String nulls;
 
     private String highLow;
@@ -247,17 +271,32 @@ public final class OrderBy<T> implements Serializable {
       this.highLow = highLow;
     }
 
+    public Property(String property, boolean ascending, String collation) {
+      this.property = property;
+      this.ascending = ascending;
+      this.collation = collation;
+    }
+
+    public Property(String property, boolean ascending, String collation, String nulls, String highLow) {
+      this.property = property;
+      this.ascending = ascending;
+      this.collation = collation;
+      this.nulls = nulls;
+      this.highLow = highLow;
+    }
+
     /**
      * Return a copy of this Property with the path trimmed.
      */
     public Property copyWithTrim(String path) {
-      return new Property(property.substring(path.length() + 1), ascending, nulls, highLow);
+      return new Property(property.substring(path.length() + 1), ascending, collation, nulls, highLow);
     }
 
     @Override
     public int hashCode() {
       int hc = property.hashCode();
       hc = hc * 92821 + (ascending ? 0 : 1);
+      hc = hc * 92821 + (collation == null ? 0 : collation.hashCode());
       hc = hc * 92821 + (nulls == null ? 0 : nulls.hashCode());
       hc = hc * 92821 + (highLow == null ? 0 : highLow.hashCode());
       return hc;
@@ -274,8 +313,9 @@ public final class OrderBy<T> implements Serializable {
       Property e = (Property) obj;
       if (ascending != e.ascending) return false;
       if (!property.equals(e.property)) return false;
-      if (nulls != null ? !nulls.equals(e.nulls) : e.nulls != null) return false;
-      return highLow != null ? highLow.equals(e.highLow) : e.highLow == null;
+      if (!Objects.equals(collation, e.collation)) return false;
+      if (!Objects.equals(nulls, e.nulls)) return false;
+      return Objects.equals(highLow, e.highLow);
     }
 
     @Override
@@ -284,7 +324,7 @@ public final class OrderBy<T> implements Serializable {
     }
 
     public String toStringFormat() {
-      if (nulls == null) {
+      if (nulls == null && collation == null) {
         if (ascending) {
           return property;
         } else {
@@ -292,11 +332,23 @@ public final class OrderBy<T> implements Serializable {
         }
       } else {
         StringBuilder sb = new StringBuilder();
-        sb.append(property);
+        if (collation != null)  {
+          if (collation.contains("${}")) {
+            // this is a complex collation, e.g. DB2 - we must replace the property
+            sb.append(StringHelper.replaceString(collation, "${}", property));
+          } else {
+            sb.append(property);
+            sb.append(" collate ").append(collation);
+          }
+        } else {
+          sb.append(property);
+        }
         if (!ascending) {
           sb.append(" ").append("desc");
         }
-        sb.append(" ").append(nulls).append(" ").append(highLow);
+        if (nulls != null) {
+          sb.append(" ").append(nulls).append(" ").append(highLow);
+        }
         return sb.toString();
       }
     }
@@ -319,7 +371,7 @@ public final class OrderBy<T> implements Serializable {
      * Return a copy of this property.
      */
     public Property copy() {
-      return new Property(property, ascending, nulls, highLow);
+      return new Property(property, ascending, collation, nulls, highLow);
     }
 
     /**

src/main/java/io/ebean/Query.java

@@ -924,11 +924,31 @@ public interface Query<T> {
    */
   int delete();
 
+  /**
+   * Execute as a delete query returning the number of rows deleted using the given transaction.
+   * <p>
+   * Note that if the query includes joins then the generated delete statement may not be
+   * optimal depending on the database platform.
+   * </p>
+   *
+   * @return the number of beans/rows that were deleted.
+   */
+  int delete(Transaction transaction);
+
   /**
    * Execute the UpdateQuery returning the number of rows updated.
+   *
+   * @return the number of beans/rows updated.
    */
   int update();
 
+  /**
+   * Execute the UpdateQuery returning the number of rows updated using the given transaction.
+   *
+   * @return the number of beans/rows updated.
+   */
+  int update(Transaction transaction);
+
   /**
    * Return the count of entities this query should return.
    * <p>

src/main/java/io/ebean/SqlUpdate.java

@@ -98,6 +98,11 @@ public interface SqlUpdate {
   /**
    * Execute the update returning the number of rows modified.
    * <p>
+   * Note that if the transaction has batch mode on then this update will use JDBC batch and may not execute until
+   * later - at commit time or a transaction flush. In this case this method returns -1 indicating that the
+   * update has been batched for later execution.
+   * </p>
+   * <p>
    * After you have executed the SqlUpdate you can bind new variables using
    * {@link #setParameter(String, Object)} etc and then execute the SqlUpdate
    * again.
@@ -112,6 +117,11 @@ public interface SqlUpdate {
    */
   int execute();
 
+  /**
+   * Execute the statement now regardless of the JDBC batch mode of the transaction.
+   */
+  int executeNow();
+
   /**
    * Execute when addBatch() has been used to batch multiple bind executions.
    *

src/main/java/io/ebean/Transaction.java

@@ -84,7 +84,7 @@ public interface Transaction extends AutoCloseable {
    * <p>
    * This is similar to commit() but leaves the transaction "Active".
    * </p>
-   * <h3>Functions/h3>
+   * <h3>Functions</h3>
    * <ul>
    * <li>Flush the JDBC batch buffer</li>
    * <li>Call commit on the underlying JDBC connection</li>
@@ -100,7 +100,7 @@ public interface Transaction extends AutoCloseable {
    * This performs commit and completes the transaction closing underlying resources and
    * marking the transaction as "In active".
    * </p>
-   * <h3>Functions/h3>
+   * <h3>Functions</h3>
    * <ul>
    * <li>Flush the JDBC batch buffer</li>
    * <li>Call commit on the underlying JDBC connection</li>
@@ -117,7 +117,7 @@ public interface Transaction extends AutoCloseable {
    * <p>
    * This performs rollback, closes underlying resources and marks the transaction as "In active".
    * </p>
-   * <h3>Functions/h3>
+   * <h3>Functions</h3>
    * <ul>
    * <li>Call rollback on the underlying JDBC connection</li>
    * <li>Trigger any registered TransactionCallbacks</li>

src/main/java/io/ebean/bean/EntityBeanIntercept.java

@@ -71,21 +71,30 @@ public final class EntityBeanIntercept implements Serializable {
   /**
    * Used when a bean is partially filled.
    */
-  private final boolean[] loadedProps;
-
-  private boolean fullyLoadedBean;
+  private static final byte FLAG_LOADED_PROP = 1;
 
   /**
    * Set of changed properties.
    */
-  private boolean[] changedProps;
+  private static final byte FLAG_CHANGED_PROP = 2;
 
   /**
    * Flags indicating if a property is a dirty embedded bean. Used to distingush
    * between an embedded bean being completely overwritten and one of its
    * embedded properties being made dirty.
    */
-  private boolean[] embeddedDirty;
+  private static final byte FLAG_EMBEDDED_DIRTY = 4;
+
+  /**
+   * Flags indicating if a property is a dirty embedded bean. Used to distingush
+   * between an embedded bean being completely overwritten and one of its
+   * embedded properties being made dirty.
+   */
+  private static final byte FLAG_ORIG_VALUE_SET = 8;
+
+  private final byte[] flags;
+
+  private boolean fullyLoadedBean;
 
   private Object[] origValues;
 
@@ -102,7 +111,7 @@ public final class EntityBeanIntercept implements Serializable {
    */
   public EntityBeanIntercept(Object ownerBean) {
     this.owner = (EntityBean) ownerBean;
-    this.loadedProps = new boolean[owner._ebean_getPropertyNames().length];
+    this.flags = new byte[owner._ebean_getPropertyNames().length];
   }
 
   /**
@@ -213,8 +222,8 @@ public final class EntityBeanIntercept implements Serializable {
    * Check each property to see if the bean is partially loaded.
    */
   public boolean isPartial() {
-    for (boolean loadedProp : loadedProps) {
-      if (!loadedProp) {
+    for (byte flag : flags) {
+      if ((flag & FLAG_LOADED_PROP) == 0) {
         return true;
       }
     }
@@ -259,10 +268,10 @@ public final class EntityBeanIntercept implements Serializable {
    * Return true if only the Id property has been loaded.
    */
   public boolean hasIdOnly(int idIndex) {
-    for (int i = 0; i < loadedProps.length; i++) {
+    for (int i = 0; i < flags.length; i++) {
       if (i == idIndex) {
-        if (!loadedProps[i]) return false;
-      } else if (loadedProps[i]) {
+        if ((flags[i] & FLAG_LOADED_PROP) == 0) return false;
+      } else if ((flags[i] & FLAG_LOADED_PROP) != 0) {
         return false;
       }
     }
@@ -284,9 +293,9 @@ public final class EntityBeanIntercept implements Serializable {
     if (idPos > -1) {
       // For cases where properties are set on constructor
       // set every non Id property to unloaded (for lazy loading)
-      for (int i = 0; i < loadedProps.length; i++) {
+      for (int i = 0; i < flags.length; i++) {
         if (i != idPos) {
-          loadedProps[i] = false;
+          flags[i] &= ~FLAG_LOADED_PROP;
         }
       }
     }
@@ -352,7 +361,9 @@ public final class EntityBeanIntercept implements Serializable {
     this.owner._ebean_setEmbeddedLoaded();
     this.lazyLoadProperty = -1;
     this.origValues = null;
-    this.changedProps = null;
+    for (int i = 0; i < flags.length; i++) {
+      flags[i] &= ~(FLAG_CHANGED_PROP + FLAG_ORIG_VALUE_SET);
+    }
     this.dirty = false;
   }
 
@@ -475,7 +486,11 @@ public final class EntityBeanIntercept implements Serializable {
     if (position == -1) {
       throw new IllegalArgumentException("Property " + propertyName + " not found");
     }
-    loadedProps[position] = loaded;
+    if (loaded) {
+      flags[position] |= FLAG_LOADED_PROP;
+    } else {
+      flags[position] &= ~FLAG_LOADED_PROP;
+    }
   }
 
   /**
@@ -483,22 +498,22 @@ public final class EntityBeanIntercept implements Serializable {
    * constructor.
    */
   public void setPropertyUnloaded(int propertyIndex) {
-    loadedProps[propertyIndex] = false;
+    flags[propertyIndex] &= ~FLAG_LOADED_PROP;
   }
 
   /**
    * Set the property to be loaded.
    */
   public void setLoadedProperty(int propertyIndex) {
-    loadedProps[propertyIndex] = true;
+    flags[propertyIndex] |= FLAG_LOADED_PROP;
   }
 
   /**
    * Set all properties to be loaded (post insert).
    */
   public void setLoadedPropertyAll() {
-    for (int i = 0; i < loadedProps.length; i++) {
-      loadedProps[i] = true;
+    for (int i = 0; i < flags.length; i++) {
+      flags[i] |= FLAG_LOADED_PROP;
     }
   }
 
@@ -506,14 +521,14 @@ public final class EntityBeanIntercept implements Serializable {
    * Return true if the property is loaded.
    */
   public boolean isLoadedProperty(int propertyIndex) {
-    return loadedProps[propertyIndex];
+    return (flags[propertyIndex] & FLAG_LOADED_PROP) != 0;
   }
 
   /**
    * Return true if the property is considered changed.
    */
   public boolean isChangedProperty(int propertyIndex) {
-    return (changedProps != null && changedProps[propertyIndex]);
+    return (flags[propertyIndex] & FLAG_CHANGED_PROP) != 0;
   }
 
   /**
@@ -521,8 +536,7 @@ public final class EntityBeanIntercept implements Serializable {
    * embedded properties is dirty.
    */
   public boolean isDirtyProperty(int propertyIndex) {
-    return (changedProps != null && changedProps[propertyIndex]
-      || embeddedDirty != null && embeddedDirty[propertyIndex]);
+    return (flags[propertyIndex] & (FLAG_CHANGED_PROP + FLAG_EMBEDDED_DIRTY)) != 0;
   }
 
   /**
@@ -534,27 +548,22 @@ public final class EntityBeanIntercept implements Serializable {
   }
 
   public void setChangedProperty(int propertyIndex) {
-    if (changedProps == null) {
-      changedProps = new boolean[owner._ebean_getPropertyNames().length];
-    }
-    changedProps[propertyIndex] = true;
+    flags[propertyIndex] |= FLAG_CHANGED_PROP;
   }
 
   /**
    * Set that an embedded bean has had one of its properties changed.
    */
   private void setEmbeddedPropertyDirty(int propertyIndex) {
-    if (embeddedDirty == null) {
-      embeddedDirty = new boolean[owner._ebean_getPropertyNames().length];
-    }
-    embeddedDirty[propertyIndex] = true;
+    flags[propertyIndex] |= FLAG_EMBEDDED_DIRTY;
   }
 
   private void setOriginalValue(int propertyIndex, Object value) {
     if (origValues == null) {
       origValues = new Object[owner._ebean_getPropertyNames().length];
     }
-    if (origValues[propertyIndex] == null) {
+    if ((flags[propertyIndex] & FLAG_ORIG_VALUE_SET) == 0) {
+      flags[propertyIndex] |= FLAG_ORIG_VALUE_SET;
       origValues[propertyIndex] = value;
     }
   }
@@ -574,13 +583,9 @@ public final class EntityBeanIntercept implements Serializable {
    */
   public void setNewBeanForUpdate() {
 
-    if (changedProps == null) {
-      changedProps = new boolean[owner._ebean_getPropertyNames().length];
-    }
-
-    for (int i = 0; i < loadedProps.length; i++) {
-      if (loadedProps[i]) {
-        changedProps[i] = true;
+    for (int i = 0; i < flags.length; i++) {
+      if ((flags[i] & FLAG_LOADED_PROP) != 0) {
+        flags[i] |= FLAG_CHANGED_PROP;
       }
     }
     setDirty(true);
@@ -594,8 +599,8 @@ public final class EntityBeanIntercept implements Serializable {
       return null;
     }
     Set<String> props = new LinkedHashSet<>();
-    for (int i = 0; i < loadedProps.length; i++) {
-      if (loadedProps[i]) {
+    for (int i = 0; i < flags.length; i++) {
+      if ((flags[i] & FLAG_LOADED_PROP) != 0) {
         props.add(getProperty(i));
       }
     }
@@ -609,12 +614,8 @@ public final class EntityBeanIntercept implements Serializable {
     int len = getPropertyLength();
     boolean[] dirties = new boolean[len];
     for (int i = 0; i < len; i++) {
-      if (changedProps != null && changedProps[i]) {
-        dirties[i] = true;
-      } else if (embeddedDirty != null && embeddedDirty[i]) {
-        // an embedded property has been changed - recurse
-        dirties[i] = true;
-      }
+      // this, or an embedded property has been changed - recurse
+      dirties[i] = (flags[i] & (FLAG_CHANGED_PROP + FLAG_EMBEDDED_DIRTY)) != 0;
     }
     return dirties;
   }
@@ -634,11 +635,11 @@ public final class EntityBeanIntercept implements Serializable {
   public void addDirtyPropertyNames(Set<String> props, String prefix) {
     int len = getPropertyLength();
     for (int i = 0; i < len; i++) {
-      if (changedProps != null && changedProps[i]) {
+      if ((flags[i] & FLAG_CHANGED_PROP) != 0) {
         // the property has been changed on this bean
         String propName = (prefix == null ? getProperty(i) : prefix + getProperty(i));
         props.add(propName);
-      } else if (embeddedDirty != null && embeddedDirty[i]) {
+      } else if ((flags[i] & FLAG_EMBEDDED_DIRTY) != 0) {
         // an embedded property has been changed - recurse
         EntityBean embeddedBean = (EntityBean) owner._ebean_getField(i);
         embeddedBean._ebean_getIntercept().addDirtyPropertyNames(props, getProperty(i) + ".");
@@ -654,12 +655,12 @@ public final class EntityBeanIntercept implements Serializable {
     String[] names = owner._ebean_getPropertyNames();
     int len = getPropertyLength();
     for (int i = 0; i < len; i++) {
-      if (changedProps != null && changedProps[i]) {
+      if ((flags[i] & FLAG_CHANGED_PROP) != 0) {
         // the property has been changed on this bean
         if (propertyNames.contains(names[i])) {
           return true;
         }
-      } else if (embeddedDirty != null && embeddedDirty[i]) {
+      } else if ((flags[i] & FLAG_EMBEDDED_DIRTY) != 0) {
         if (propertyNames.contains(names[i])) {
           return true;
         }
@@ -683,15 +684,16 @@ public final class EntityBeanIntercept implements Serializable {
   public void addDirtyPropertyValues(Map<String, ValuePair> dirtyValues, String prefix) {
     int len = getPropertyLength();
     for (int i = 0; i < len; i++) {
-      if (changedProps != null && changedProps[i]) {
+      if ((flags[i] & FLAG_CHANGED_PROP) != 0) {
         // the property has been changed on this bean
         String propName = (prefix == null ? getProperty(i) : prefix + getProperty(i));
         Object newVal = owner._ebean_getField(i);
         Object oldVal = getOrigValue(i);
+        if (!areEqual(oldVal, newVal)) {
+          dirtyValues.put(propName, new ValuePair(newVal, oldVal));
+        }
 
-        dirtyValues.put(propName, new ValuePair(newVal, oldVal));
-
-      } else if (embeddedDirty != null && embeddedDirty[i]) {
+      } else if ((flags[i] & FLAG_EMBEDDED_DIRTY) != 0) {
         // an embedded property has been changed - recurse
         EntityBean embeddedBean = (EntityBean) owner._ebean_getField(i);
         embeddedBean._ebean_getIntercept().addDirtyPropertyValues(dirtyValues, getProperty(i) + ".");
@@ -705,13 +707,15 @@ public final class EntityBeanIntercept implements Serializable {
   public void addDirtyPropertyValues(BeanDiffVisitor visitor) {
     int len = getPropertyLength();
     for (int i = 0; i < len; i++) {
-      if (changedProps != null && changedProps[i]) {
+      if ((flags[i] & FLAG_CHANGED_PROP) != 0) {
         // the property has been changed on this bean
         Object newVal = owner._ebean_getField(i);
         Object oldVal = getOrigValue(i);
-        visitor.visit(i, newVal, oldVal);
+        if (!areEqual(oldVal, newVal)) {
+          visitor.visit(i, newVal, oldVal);
+        }
 
-      } else if (embeddedDirty != null && embeddedDirty[i]) {
+      } else if ((flags[i] & FLAG_EMBEDDED_DIRTY) != 0) {
         // an embedded property has been changed - recurse
         EntityBean embeddedBean = (EntityBean) owner._ebean_getField(i);
         visitor.visitPush(i);
@@ -739,9 +743,9 @@ public final class EntityBeanIntercept implements Serializable {
     }
     int len = getPropertyLength();
     for (int i = 0; i < len; i++) {
-      if (changedProps != null && changedProps[i]) {
+      if ((flags[i] & FLAG_CHANGED_PROP) != 0) {
         sb.append(i).append(',');
-      } else if (embeddedDirty != null && embeddedDirty[i]) {
+      } else if ((flags[i] & FLAG_EMBEDDED_DIRTY) != 0) {
         // an embedded property has been changed - recurse
         EntityBean embeddedBean = (EntityBean) owner._ebean_getField(i);
         sb.append(i).append('[');
@@ -765,15 +769,12 @@ public final class EntityBeanIntercept implements Serializable {
     return sb;
   }
 
-  /**
-   * Return the set of property names for changed properties.
-   */
-  public boolean[] getChanged() {
-    return changedProps;
-  }
-
   public boolean[] getLoaded() {
-    return loadedProps;
+    boolean[] ret= new boolean[flags.length];
+    for (int i = 0; i < ret.length; i++) {
+      ret[i] = (flags[i] & FLAG_LOADED_PROP) != 0;
+    }
+    return ret;
   }
 
   /**
@@ -821,7 +822,7 @@ public final class EntityBeanIntercept implements Serializable {
    */
   private void loadBeanInternal(int loadProperty, BeanLoader loader) {
 
-    if (loadedProps == null || loadedProps[loadProperty]) {
+    if ((flags[loadProperty] & FLAG_LOADED_PROP) != 0) {
       // race condition where multiple threads calling preGetter concurrently
       return;
     }
@@ -887,7 +888,7 @@ public final class EntityBeanIntercept implements Serializable {
    * Called when a BeanCollection is initialised automatically.
    */
   public void initialisedMany(int propertyIndex) {
-    loadedProps[propertyIndex] = true;
+    flags[propertyIndex] |= FLAG_LOADED_PROP;
   }
 
   private void preGetterCallback(int propertyIndex) {

src/main/java/io/ebean/common/BeanMap.java

@@ -273,14 +273,16 @@ public final class BeanMap<K, E> extends AbstractBeanCollection<E> implements Ma
     checkReadOnly();
     init();
     if (modifyListening) {
-      Object oldBean = map.put(key, value);
+      E oldBean = map.put(key, value);
       if (value != oldBean) {
         // register the add of the new and the removal of the old
         modifyAddition(value);
         modifyRemoval(oldBean);
       }
+      return oldBean;
+    } else {
+      return map.put(key, value);
     }
-    return map.put(key, value);
   }
 
   @Override
@@ -295,8 +297,9 @@ public final class BeanMap<K, E> extends AbstractBeanCollection<E> implements Ma
           modifyRemoval(oldBean);
         }
       }
+    } else {
+      map.putAll(puts);
     }
-    map.putAll(puts);
   }
 
   @Override

src/main/java/io/ebean/config/BeanNotEnhancedException.java

@@ -0,0 +1,13 @@
+package io.ebean.config;
+
+/**
+ * Throw when an processing an entity bean that is not bytecode enhanced.
+ *
+ * Refer: https://ebean-orm.github.io/docs/trouble-shooting#not-enhanced
+ */
+public class BeanNotEnhancedException extends IllegalStateException {
+
+  public BeanNotEnhancedException(String msg) {
+    super(msg);
+  }
+}

src/main/java/io/ebean/config/BeanNotRegisteredException.java

@@ -0,0 +1,13 @@
+package io.ebean.config;
+
+/**
+ * Throw when an processing thinks a bean is not registered.
+ *
+ * Refer: https://ebean-orm.github.io/docs/trouble-shooting#not-registered
+ */
+public class BeanNotRegisteredException extends IllegalStateException {
+
+  public BeanNotRegisteredException(String msg) {
+    super(msg);
+  }
+}

src/main/java/io/ebean/config/DbMigrationConfig.java

@@ -28,34 +28,6 @@ public class DbMigrationConfig {
    */
   protected Platform platform;
 
-  /**
-   * Set to true if the DB migration should be generated on server start.
-   */
-  protected boolean generate;
-
-  /**
-   * The migration version name (typically FlywayDb compatible).
-   * <p>
-   * Example: 1.1.1_2
-   * <p>
-   * The version is expected to be the combination of the current pom version plus
-   * a 'feature' id. The combined version must be unique and ordered to work with
-   * FlywayDb so each developer sets a unique version so that the migration script
-   * generated is unique (typically just prior to being submitted as a merge request).
-   */
-  protected String version;
-
-  /**
-   * Description text that can be appended to the version to become the ddl script file name.
-   * <p>
-   * So if the name is "a foo table" then the ddl script file could be:
-   * "1.1.1_2__a-foo-table.sql"
-   * <p>
-   * When the DB migration relates to a git feature (merge request) then this description text
-   * is a short description of the feature.
-   */
-  protected String name;
-
   /**
    * Resource path for the migration xml and sql.
    */
@@ -75,13 +47,6 @@ public class DbMigrationConfig {
 
   protected String modelSuffix = ".model.xml";
 
-  protected boolean includeGeneratedFileComment;
-
-  /**
-   * The version of a pending drop that should be generated as the next migration.
-   */
-  protected String generatePendingDrop;
-
   /**
    * For running migration the DB table that holds migration execution status.
    */
@@ -228,52 +193,6 @@ public class DbMigrationConfig {
     this.applyPrefix = applyPrefix;
   }
 
-  /**
-   * Return true if the generated file comment should be included.
-   */
-  public boolean isIncludeGeneratedFileComment() {
-    return includeGeneratedFileComment;
-  }
-
-  /**
-   * Set to true if the generated file comment should be included.
-   */
-  public void setIncludeGeneratedFileComment(boolean includeGeneratedFileComment) {
-    this.includeGeneratedFileComment = includeGeneratedFileComment;
-  }
-
-  /**
-   * Return the migration version (or "next") to generate pending drops for.
-   */
-  public String getGeneratePendingDrop() {
-    return generatePendingDrop;
-  }
-
-  /**
-   * Set the migration version (or "next") to generate pending drops for.
-   */
-  public void setGeneratePendingDrop(String generatePendingDrop) {
-    this.generatePendingDrop = generatePendingDrop;
-  }
-
-  /**
-   * Set the migration version.
-   * <p>
-   * Note that version set via System property or environment variable <code>ddl.migration.version</code> takes precedence.
-   */
-  public void setVersion(String version) {
-    this.version = version;
-  }
-
-  /**
-   * Set the migration name.
-   * <p>
-   * Note that name set via System property or environment variable <code>ddl.migration.name</code> takes precedence.
-   */
-  public void setName(String name) {
-    this.name = name;
-  }
-
   /**
    * Return the table name that holds the migration run details
    * (used by DB Migration runner only).
@@ -504,14 +423,8 @@ public class DbMigrationConfig {
     applyPrefix = properties.get("migration.applyPrefix", applyPrefix);
     applySuffix = properties.get("migration.applySuffix", applySuffix);
     modelSuffix = properties.get("migration.modelSuffix", modelSuffix);
-    includeGeneratedFileComment = properties.getBoolean("migration.includeGeneratedFileComment", includeGeneratedFileComment);
-    generatePendingDrop = properties.get("migration.generatePendingDrop", generatePendingDrop);
 
     platform = properties.getEnum(Platform.class, "migration.platform", platform);
-
-    generate = properties.getBoolean("migration.generate", generate);
-    version = properties.get("migration.version", version);
-    name = properties.get("migration.name", name);
     patchInsertOn = properties.get("migration.patchInsertOn", patchInsertOn);
     patchResetChecksumOn = properties.get("migration.patchResetChecksumOn", patchResetChecksumOn);
 
@@ -532,44 +445,6 @@ public class DbMigrationConfig {
     ddlHeader = properties.get("ddl.header", ddlHeader);
   }
 
-  /**
-   * Return the migration version (typically FlywayDb compatible).
-   * <p>
-   * Example: 1.1.1_2
-   * <p>
-   * The version is expected to be the combination of the current pom version plus
-   * a 'feature' id. The combined version must be unique and ordered to work with
-   * FlywayDb so each developer sets a unique version so that the migration script
-   * generated is unique (typically just prior to being submitted as a merge request).
-   */
-  public String getVersion() {
-    String envVersion = readEnvironment("ddl.migration.version");
-    if (!isEmpty(envVersion)) {
-      return envVersion.trim();
-    }
-    return version;
-  }
-
-  /**
-   * Return the migration name which is short description text that can be appended to
-   * the migration version to become the ddl script file name.
-   * <p>
-   * So if the name is "a foo table" then the ddl script file could be:
-   * "1.1.1_2__a-foo-table.sql"
-   * </p>
-   * <p>
-   * When the DB migration relates to a git feature (merge request) then this description text
-   * is a short description of the feature.
-   * </p>
-   */
-  public String getName() {
-    String envName = readEnvironment("ddl.migration.name");
-    if (!isEmpty(envName)) {
-      return envName.trim();
-    }
-    return name;
-  }
-
   /**
    * Return the system or environment property.
    */

src/main/java/io/ebean/config/ServerConfig.java

@@ -30,7 +30,7 @@ import io.ebean.event.readaudit.ReadAuditPrepare;
 import io.ebean.meta.MetaInfoManager;
 import io.ebean.migration.MigrationRunner;
 import io.ebean.util.StringHelper;
-import org.avaje.datasource.DataSourceConfig;
+import io.ebean.datasource.DataSourceConfig;
 
 import javax.sql.DataSource;
 import java.time.Clock;
@@ -1965,6 +1965,15 @@ public class ServerConfig {
    * Return the UUID state file.
    */
   public String getUuidStateFile() {
+    if (uuidStateFile == null || uuidStateFile.isEmpty()) {
+      // by default, add servername...
+      uuidStateFile = name + "-uuid.state";
+      // and store it in the user's home directory
+      String homeDir = System.getProperty("user.home");
+      if (homeDir != null && homeDir.isEmpty()) {
+        uuidStateFile = homeDir + "/.ebean/" + uuidStateFile;
+      }
+    }
     return uuidStateFile;
   }
 

src/main/java/io/ebean/config/dbplatform/DatabasePlatform.java

@@ -64,8 +64,6 @@ public class DatabasePlatform {
    */
   protected String closeQuote = "\"";
 
-  protected String concatOperator = "||";
-
   /**
    * When set to true all db column names and table names use quoted identifiers.
    */
@@ -178,9 +176,17 @@ public class DatabasePlatform {
    * findIterate() and findVisit().
    */
   protected boolean forwardOnlyHintOnFindIterate;
+  
+  /**
+   * If set then use the CONCUR_UPDATABLE hint when creating ResultSets.
+   * 
+   * This is {@code false} for HANA
+   */
+  protected boolean supportsResultSetConcurrencyModeUpdatable = true;
+
 
   /**
-   * By default we use JDBC batch when cascading (except for SQL Server).
+   * By default we use JDBC batch when cascading (except for SQL Server and HANA).
    */
   protected PersistBatch persistBatchOnCascade = PersistBatch.ALL;
 
@@ -455,13 +461,6 @@ public class DatabasePlatform {
     return openQuote;
   }
 
-  /**
-   * Return the DB concat operator.
-   */
-  public String getConcatOperator() {
-    return concatOperator;
-  }
-
   /**
    * Return the JDBC type used to store booleans.
    */
@@ -525,6 +524,24 @@ public class DatabasePlatform {
   public void setForwardOnlyHintOnFindIterate(boolean forwardOnlyHintOnFindIterate) {
     this.forwardOnlyHintOnFindIterate = forwardOnlyHintOnFindIterate;
   }
+  
+  /**
+   * Return true if the ResultSet CONCUR_UPDATABLE Hint should be used on
+   * createNativeSqlTree() PreparedStatements.
+   * <p>
+   * This specifically is required for Hana which doesn't support CONCUR_UPDATABLE
+   * </p>
+   */
+  public boolean isSupportsResultSetConcurrencyModeUpdatable() {
+    return supportsResultSetConcurrencyModeUpdatable;
+  }
+  
+  /**
+   * Set to true if the ResultSet CONCUR_UPDATABLE Hint should be used by default on createNativeSqlTree() PreparedStatements.
+   */
+  public void setSupportsResultSetConcurrencyModeUpdatable(boolean supportsResultSetConcurrencyModeUpdatable) {
+    this.supportsResultSetConcurrencyModeUpdatable = supportsResultSetConcurrencyModeUpdatable;
+  }
 
   /**
    * Normally not needed - overridden in CockroachPlatform.

src/main/java/io/ebean/config/dbplatform/DbIdentity.java

@@ -8,7 +8,9 @@ import java.util.regex.Pattern;
  */
 public class DbIdentity {
 
-  private static final Pattern TABLE_REPLACE = Pattern.compile("{table}", Pattern.LITERAL);
+  private static final String TABLE_PLACEHOLDER = "{table}";
+
+  private static final Pattern TABLE_REPLACE = Pattern.compile(TABLE_PLACEHOLDER, Pattern.LITERAL);
 
   /**
    * Set if this DB supports sequences. Note some DB's support both Sequences
@@ -53,7 +55,9 @@ public class DbIdentity {
     if (selectLastInsertedIdTemplate == null) {
       return null;
     }
-
+    if (!selectLastInsertedIdTemplate.contains(TABLE_PLACEHOLDER)) {
+      return selectLastInsertedIdTemplate;
+    }
     return TABLE_REPLACE.matcher(selectLastInsertedIdTemplate).replaceAll(Matcher.quoteReplacement(table));
   }
 

src/main/java/io/ebean/config/dbplatform/hana/HanaBasicSqlLimiter.java

@@ -0,0 +1,24 @@
+package io.ebean.config.dbplatform.hana;
+
+import io.ebean.config.dbplatform.BasicSqlLimiter;
+
+public class HanaBasicSqlLimiter implements BasicSqlLimiter {
+  @Override
+  public String limit(String dbSql, int firstRow, int maxRows) {
+    StringBuilder sb = new StringBuilder(50 + dbSql.length());
+
+    sb.append(dbSql);
+
+    if (maxRows > 0) {
+      sb.append(" ").append("limit");
+      sb.append(" ").append(maxRows);
+
+      if (firstRow > 0) {
+        sb.append(" ").append("offset").append(" ");
+        sb.append(firstRow);
+      }
+    }
+
+    return sb.toString();
+  }
+}

src/main/java/io/ebean/config/dbplatform/hana/HanaHistorySupport.java

@@ -0,0 +1,27 @@
+package io.ebean.config.dbplatform.hana;
+
+import io.ebean.config.dbplatform.DbStandardHistorySupport;
+
+public class HanaHistorySupport extends DbStandardHistorySupport {
+
+  @Override
+  public String getAsOfViewSuffix(String asOfViewSuffix) {
+    return " for system_time as of ?";
+  }
+
+  @Override
+  public String getVersionsBetweenSuffix(String asOfViewSuffix) {
+    return " for system_time between ? and ?";
+  }
+
+  @Override
+  public String getSysPeriodLower(String tableAlias, String sysPeriod) {
+    return tableAlias + "." + sysPeriod + "_start";
+  }
+
+  @Override
+  public String getSysPeriodUpper(String tableAlias, String sysPeriod) {
+    return tableAlias + "." + sysPeriod + "_end";
+  }
+  
+}

src/main/java/io/ebean/config/dbplatform/hana/HanaPlatform.java

@@ -0,0 +1,96 @@
+package io.ebean.config.dbplatform.hana;
+
+import io.ebean.Query.ForUpdate;
+import io.ebean.annotation.PersistBatch;
+import io.ebean.annotation.Platform;
+import io.ebean.config.PlatformConfig;
+import io.ebean.config.dbplatform.DatabasePlatform;
+import io.ebean.config.dbplatform.DbPlatformType;
+import io.ebean.config.dbplatform.DbType;
+import io.ebean.config.dbplatform.IdType;
+import io.ebean.config.dbplatform.SqlErrorCodes;
+
+public class HanaPlatform extends DatabasePlatform {
+
+  public HanaPlatform() {
+    this.platform = Platform.HANA;
+    this.sqlLimiter = new HanaSqlLimiter();
+    this.persistBatchOnCascade = PersistBatch.NONE;
+    this.supportsResultSetConcurrencyModeUpdatable = false;
+    this.columnAliasPrefix = null;
+
+    this.historySupport = new HanaHistorySupport();
+    this.basicSqlLimiter = new HanaBasicSqlLimiter();
+
+    this.likeClauseRaw = "like ?";
+    this.maxConstraintNameLength = 127;
+    this.maxTableNameLength = 127;
+
+    this.dbDefaultValue.setNow("current_timestamp");
+
+    this.exceptionTranslator = new SqlErrorCodes().addAcquireLock("131", "133", "146")
+      .addDataIntegrity("130", "429", "461", "462").addDuplicateKey("144", "301", "349").build();
+
+    this.dbIdentity.setIdType(IdType.IDENTITY);
+    this.dbIdentity.setSelectLastInsertedIdTemplate("select current_identity_value() from sys.dummy");
+    this.dbIdentity.setSupportsGetGeneratedKeys(false);
+    this.dbIdentity.setSupportsIdentity(true);
+
+    this.dbTypeMap.put(DbType.BIGINT, new DbPlatformType("bigint", false));
+    this.dbTypeMap.put(DbType.BINARY, new DbPlatformType("varbinary", 255));
+    this.dbTypeMap.put(DbType.BIT, new DbPlatformType("smallint", false));
+    this.dbTypeMap.put(DbType.BLOB, new DbPlatformType("blob", false));
+    this.dbTypeMap.put(DbType.CHAR, new DbPlatformType("nvarchar", 255));
+    this.dbTypeMap.put(DbType.CLOB, new DbPlatformType("nclob", false));
+    this.dbTypeMap.put(DbType.INTEGER, new DbPlatformType("integer", false));
+    this.dbTypeMap.put(DbType.JSONVARCHAR, new DbPlatformType("nvarchar", 255));
+    this.dbTypeMap.put(DbType.LINESTRING, new DbPlatformType("st_geometry"));
+    this.dbTypeMap.put(DbType.LONGVARBINARY, new DbPlatformType("blob", false));
+    this.dbTypeMap.put(DbType.LONGVARCHAR, new DbPlatformType("nclob", false));
+    this.dbTypeMap.put(DbType.MULTILINESTRING, new DbPlatformType("st_geometry"));
+    this.dbTypeMap.put(DbType.MULTIPOINT, new DbPlatformType("st_geometry"));
+    this.dbTypeMap.put(DbType.MULTIPOLYGON, new DbPlatformType("st_geometry"));
+    this.dbTypeMap.put(DbType.POINT, new DbPlatformType("st_point"));
+    this.dbTypeMap.put(DbType.POLYGON, new DbPlatformType("st_geometry"));
+    this.dbTypeMap.put(DbType.SMALLINT, new DbPlatformType("smallint", false));
+    this.dbTypeMap.put(DbType.TINYINT, new DbPlatformType("smallint", false));
+    this.dbTypeMap.put(DbType.UUID, new DbPlatformType("varchar", 40));
+    this.dbTypeMap.put(DbType.VARBINARY, new DbPlatformType("varbinary", 255));
+    this.dbTypeMap.put(DbType.VARCHAR, new DbPlatformType("nvarchar", 255));
+  }
+
+  @Override
+  protected void addGeoTypes(int srid) {
+    this.dbTypeMap.put(DbType.LINESTRING, new DbPlatformType("st_geometry(" + srid + ")", false));
+    this.dbTypeMap.put(DbType.MULTILINESTRING, new DbPlatformType("st_geometry(" + srid + ")", false));
+    this.dbTypeMap.put(DbType.MULTIPOINT, new DbPlatformType("st_geometry(" + srid + ")", false));
+    this.dbTypeMap.put(DbType.MULTIPOLYGON, new DbPlatformType("st_geometry(" + srid + ")", false));
+    this.dbTypeMap.put(DbType.POINT, new DbPlatformType("st_point(" + srid + ")", false));
+    this.dbTypeMap.put(DbType.POLYGON, new DbPlatformType("st_geometry(" + srid + ")", false));
+  }
+
+  @Override
+  protected String withForUpdate(String sql, ForUpdate forUpdateMode) {
+    switch (forUpdateMode) {
+      case BASE:
+        return sql + " for update";
+      case NOWAIT:
+        return sql + " for update nowait";
+      case SKIPLOCKED:
+        return sql + " for update ignore locked";
+      default:
+        throw new IllegalArgumentException("Unknown update mode: " + forUpdateMode.name());
+    }
+  }
+
+  @Override
+  protected void configure(PlatformConfig config, boolean allQuotedIdentifiers) {
+    super.configure(config, allQuotedIdentifiers);
+    if (config.getDbUuid().useBinary()) {
+      this.dbTypeMap.put(DbType.UUID, new DbPlatformType("varbinary", 16));
+    } else {
+      this.dbTypeMap.put(DbType.UUID, new DbPlatformType("varchar", 40));
+    }
+  }
+
+}

src/main/java/io/ebean/config/dbplatform/hana/HanaSqlLimiter.java

@@ -0,0 +1,35 @@
+package io.ebean.config.dbplatform.hana;
+
+import io.ebean.config.dbplatform.SqlLimitRequest;
+import io.ebean.config.dbplatform.SqlLimitResponse;
+import io.ebean.config.dbplatform.SqlLimiter;
+
+public class HanaSqlLimiter implements SqlLimiter {
+  @Override
+  public SqlLimitResponse limit(SqlLimitRequest request) {
+    String dbSql = request.getDbSql();
+
+    StringBuilder sb = new StringBuilder(50 + dbSql.length());
+    sb.append("select ");
+    if (request.isDistinct()) {
+      sb.append("distinct ");
+    }
+
+    sb.append(dbSql);
+
+    int firstRow = request.getFirstRow();
+    int maxRows = request.getMaxRows();
+
+    if (maxRows > 0) {
+      sb.append(" ").append("limit ").append(maxRows);
+      if (firstRow > 0) {
+        sb.append(" ").append("offset ");
+        sb.append(firstRow);
+      }
+    }
+
+    String sql = request.getDbPlatform().completeSql(sb.toString(), request.getOrmQuery());
+
+    return new SqlLimitResponse(sql, false);
+  }
+}

src/main/java/io/ebean/config/dbplatform/hana/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * SAP HANA specific support.
+ */
+package io.ebean.config.dbplatform.hana;

src/main/java/io/ebean/dbmigration/DbMigration.java

@@ -7,6 +7,7 @@ import io.ebean.config.dbplatform.DatabasePlatform;
 
 import java.io.IOException;
 import java.util.Iterator;
+import java.util.List;
 import java.util.ServiceLoader;
 
 /**
@@ -147,6 +148,11 @@ public interface DbMigration {
    */
   void addDatabasePlatform(DatabasePlatform databasePlatform, String prefix);
 
+  /**
+   * Return the list of versions that contain pending drops.
+   */
+  List<String> getPendingDrops();
+
   /**
    * Generate the next migration xml file and associated apply and rollback sql scripts.
    * <p>

src/main/java/io/ebean/plugin/BeanType.java

@@ -9,6 +9,10 @@ import io.ebean.event.BeanQueryAdapter;
 import io.ebeanservice.docstore.api.mapping.DocumentMapping;
 
 import java.util.Collection;
+import java.util.List;
+import java.util.function.Consumer;
+
+import javax.annotation.Nonnull;
 
 /**
  * Information and methods on BeanDescriptors made available to plugins.
@@ -18,6 +22,7 @@ public interface BeanType<T> {
   /**
    * Return the short name of the bean type.
    */
+  @Nonnull
   String getName();
 
   /**
@@ -28,11 +33,13 @@ public interface BeanType<T> {
   /**
    * Return the full name of the bean type.
    */
+  @Nonnull
   String getFullName();
 
   /**
    * Return the class type this BeanDescriptor describes.
    */
+  @Nonnull
   Class<T> getBeanType();
 
   /**
@@ -43,6 +50,7 @@ public interface BeanType<T> {
   /**
    * Return all the properties for this bean type.
    */
+  @Nonnull
   Collection<? extends Property> allProperties();
 
   /**
@@ -197,6 +205,28 @@ public interface BeanType<T> {
    */
   boolean hasInheritance();
 
+  /**
+   * Return true if this object is the root level object in its entity
+   * inheritance.
+   */
+  boolean isInheritanceRoot();
+
+  /**
+   * Returns all direct children of this beantype
+   */
+  List<BeanType<?>> getInheritanceChildren();
+
+  /**
+   * Returns the parent in inheritance hiearchy
+   */
+  BeanType<?> getInheritanceParent();
+
+  /**
+   * Visit all children recursively
+   * @param visitor
+   */
+  void visitAllInheritanceChildren(Consumer<BeanType<?>> visitor);
+
   /**
    * Return the discriminator column.
    */

src/main/java/io/ebean/plugin/Property.java

@@ -1,5 +1,7 @@
 package io.ebean.plugin;
 
+import javax.annotation.Nonnull;
+
 /**
  * Property of a entity bean that can be read.
  */
@@ -8,8 +10,15 @@ public interface Property {
   /**
    * Return the name of the property.
    */
+  @Nonnull
   String getName();
 
+  /**
+   * Return the type of the property.
+   */
+  @Nonnull
+  Class<?> getPropertyType();
+
   /**
    * Return the value of the property on the given bean.
    */

src/main/java/io/ebeaninternal/api/SpiEbeanServer.java

@@ -312,4 +312,8 @@ public interface SpiEbeanServer extends ExtendedServer, EbeanServer, BeanLoader,
    */
   int[] executeBatch(SpiSqlUpdate defaultSqlUpdate, SpiTransaction transaction);
 
+  /**
+   * Execute the sql update regardless of transaction batch mode.
+   */
+  int executeNow(SpiSqlUpdate sqlUpdate);
 }

src/main/java/io/ebeaninternal/api/SpiQuery.java

@@ -134,27 +134,40 @@ public interface SpiQuery<T> extends Query<T>, TxnProfileEventCodes {
     /**
      * Includes soft deletes rows in the result.
      */
-    SOFT_DELETED,
+    SOFT_DELETED(false),
 
     /**
      * Query runs against draft tables.
      */
-    DRAFT,
+    DRAFT(false),
 
     /**
      * Query runs against current data (normal).
      */
-    CURRENT,
+    CURRENT(false),
 
     /**
      * Query runs potentially returning many versions of the same bean.
      */
-    VERSIONS,
+    VERSIONS(true),
 
     /**
      * Query runs 'As Of' a given date time.
      */
-    AS_OF;
+    AS_OF(true);
+
+    private final boolean history;
+
+    TemporalMode(boolean history) {
+      this.history = history;
+    }
+
+    /**
+     * Return true if this is a history query.
+     */
+    public boolean isHistory() {
+      return history;
+    }
 
     /**
      * Return the mode of the query of if null return CURRENT mode.

src/main/java/io/ebeaninternal/api/TransactionEvent.java

@@ -9,6 +9,7 @@ import io.ebeaninternal.server.transaction.TransactionManager;
 import io.ebeanservice.docstore.api.DocStoreUpdates;
 
 import java.io.Serializable;
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -29,16 +30,21 @@ public class TransactionEvent implements Serializable {
    */
   private final transient boolean local;
 
+  private final long startMillis;
+
   private TransactionEventTable eventTables;
 
-  private transient TransactionEventBeans eventBeans;
+  private transient List<PersistRequestBean<?>> listenerNotify;
 
   private transient DeleteByIdMap deleteByIdMap;
 
+  private transient CacheChangeSet changeSet;
+
   /**
    * Create the TransactionEvent, one per Transaction.
    */
-  public TransactionEvent() {
+  public TransactionEvent(long startMillis) {
+    this.startMillis = startMillis;
     this.local = true;
   }
 
@@ -71,8 +77,8 @@ public class TransactionEvent implements Serializable {
   /**
    * Return the list of PersistRequestBean's for this transaction.
    */
-  public List<PersistRequestBean<?>> getPersistRequestBeans() {
-    return (eventBeans == null) ? null : eventBeans.getRequests();
+  public List<PersistRequestBean<?>> getListenerNotify() {
+    return (listenerNotify == null) ? null : listenerNotify;
   }
 
   public TransactionEventTable getEventTables() {
@@ -94,17 +100,13 @@ public class TransactionEvent implements Serializable {
   }
 
   /**
-   * Add a inserted updated or deleted bean to the event.
+   * Add post commit listeners. Watch this for large transactions.
    */
-  public void add(PersistRequestBean<?> request) {
-
-    if (request.isNotify()) {
-      // either a BeanListener or Cache is interested
-      if (eventBeans == null) {
-        eventBeans = new TransactionEventBeans();
-      }
-      eventBeans.add(request);
+  public void addListenerNotify(PersistRequestBean<?> request) {
+    if (listenerNotify == null) {
+      listenerNotify = new ArrayList<>();
     }
+    listenerNotify.add(request);
   }
 
   /**
@@ -112,11 +114,13 @@ public class TransactionEvent implements Serializable {
    */
   public CacheChangeSet buildCacheChanges(TransactionManager manager) {
 
-    if (eventBeans == null && deleteByIdMap == null && eventTables == null) {
+    if (changeSet == null && deleteByIdMap == null && eventTables == null) {
       return null;
     }
 
-    CacheChangeSet changeSet = new CacheChangeSet(manager.clockNowMillis());
+    if (changeSet == null) {
+      changeSet = new CacheChangeSet(manager.clockNowMillis());
+    }
     if (eventTables != null && !eventTables.isEmpty()) {
       // notify cache with table based changes
       BeanDescriptorManager dm = manager.getBeanDescriptorManager();
@@ -124,9 +128,6 @@ public class TransactionEvent implements Serializable {
         dm.cacheNotify(tableIUD, changeSet);
       }
     }
-    if (eventBeans != null) {
-      eventBeans.notifyCache(changeSet);
-    }
     if (deleteByIdMap != null) {
       deleteByIdMap.notifyCache(changeSet);
     }
@@ -137,12 +138,25 @@ public class TransactionEvent implements Serializable {
    * Add any relevant PersistRequestBean's to DocStoreUpdates for later processing.
    */
   public void addDocStoreUpdates(DocStoreUpdates docStoreUpdates) {
-
-    List<PersistRequestBean<?>> persistRequestBeans = getPersistRequestBeans();
-    if (persistRequestBeans != null) {
-      for (PersistRequestBean<?> persistRequestBean : persistRequestBeans) {
+    List<PersistRequestBean<?>> requests = getListenerNotify();
+    if (requests != null) {
+      for (PersistRequestBean<?> persistRequestBean : requests) {
         persistRequestBean.addDocStoreUpdates(docStoreUpdates);
       }
     }
   }
+
+  /**
+   * Return the CacheChangeSet that we add cache notification messages to.
+   *
+   * We want to add to this change set as we process requests allowing the
+   * PersistRequestBean to be garbage collected for large transactions.
+   */
+  public CacheChangeSet obtainCacheChangeSet() {
+    if (changeSet == null) {
+      changeSet = new CacheChangeSet(startMillis);
+    }
+    return changeSet;
+  }
+
 }

src/main/java/io/ebeaninternal/api/TransactionEventBeans.java

@@ -1,44 +0,0 @@
-package io.ebeaninternal.api;
-
-import io.ebeaninternal.server.cache.CacheChangeSet;
-import io.ebeaninternal.server.core.PersistRequestBean;
-
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * Lists of inserted updated and deleted beans that have a BeanPersistListener.
- * <p>
- * These beans will be sent to the appropriate BeanListeners after a successful
- * commit of the transaction.
- * </p>
- */
-public class TransactionEventBeans {
-
-  final ArrayList<PersistRequestBean<?>> requests = new ArrayList<>();
-
-  /**
-   * Return the list of PersistRequests that BeanListeners are interested in.
-   */
-  public List<PersistRequestBean<?>> getRequests() {
-    return requests;
-  }
-
-  /**
-   * Add a bean for BeanListener notification.
-   */
-  public void add(PersistRequestBean<?> request) {
-
-    requests.add(request);
-  }
-
-  /**
-   * Collect the cache changes.
-   */
-  public void notifyCache(CacheChangeSet changeSet) {
-    for (PersistRequestBean<?> request : requests) {
-      request.notifyCache(changeSet);
-    }
-  }
-
-}

src/main/java/io/ebeaninternal/dbmigration/DefaultDbMigration.java

@@ -10,6 +10,7 @@ import io.ebean.config.ServerConfig;
 import io.ebean.config.dbplatform.DatabasePlatform;
 import io.ebean.config.dbplatform.db2.DB2Platform;
 import io.ebean.config.dbplatform.h2.H2Platform;
+import io.ebean.config.dbplatform.hana.HanaPlatform;
 import io.ebean.config.dbplatform.hsqldb.HsqldbPlatform;
 import io.ebean.config.dbplatform.mysql.MySqlPlatform;
 import io.ebean.config.dbplatform.oracle.OraclePlatform;
@@ -57,7 +58,7 @@ import java.util.List;
  *
  *       DbMigration migration = DbMigration.create();
  *       migration.setPathToResources("src/main/resources");
- *       migration.setPlatform(DbPlatformName.ORACLE);
+ *       migration.setPlatform(Platform.POSTGRES);
  *
  *       migration.generateMigration();
  *
@@ -65,7 +66,7 @@ import java.util.List;
  */
 public class DefaultDbMigration implements DbMigration {
 
-  protected static final Logger logger = LoggerFactory.getLogger(DefaultDbMigration.class);
+  protected static final Logger logger = LoggerFactory.getLogger("io.ebean.GenerateMigration");
 
   private static final String initialVersion = "1.0";
 
@@ -265,6 +266,7 @@ public class DefaultDbMigration implements DbMigration {
    *       migration.generateMigration();
    *
    * }</pre>
+   *
    * @return the generated migration or null
    */
   @Override
@@ -303,6 +305,23 @@ public class DefaultDbMigration implements DbMigration {
     }
   }
 
+  /**
+   * Return the versions containing pending drops.
+   */
+  public List<String> getPendingDrops() {
+    if (!online) {
+      DbOffline.setGenerateMigration();
+    }
+    setDefaults();
+    try {
+      return createRequest().getPendingDrops();
+    } finally {
+      if (!online) {
+        DbOffline.reset();
+      }
+    }
+  }
+
   /**
    * Load the configuration for each of the target platforms.
    */
@@ -494,7 +513,7 @@ public class DefaultDbMigration implements DbMigration {
     if (nextDrop != null) {
       return nextDrop;
     }
-    return migrationConfig.getGeneratePendingDrop();
+    return generatePendingDrop;
   }
 
   /**
@@ -504,14 +523,15 @@ public class DefaultDbMigration implements DbMigration {
    */
   private String getFullVersion(MigrationModel migrationModel, String dropsFor) {
 
-    String version = migrationConfig.getVersion();
+    String version = getVersion();
     if (version == null) {
       version = migrationModel.getNextVersion(initialVersion);
     }
 
     String fullVersion = migrationConfig.getApplyPrefix() + version;
-    if (migrationConfig.getName() != null) {
-      fullVersion += "__" + toUnderScore(migrationConfig.getName());
+    String name = getName();
+    if (name != null) {
+      fullVersion += "__" + toUnderScore(name);
 
     } else if (dropsFor != null) {
       fullVersion += "__" + toUnderScore("dropsFor_" + MigrationVersion.trim(dropsFor));
@@ -558,7 +578,7 @@ public class DefaultDbMigration implements DbMigration {
     if (file.exists()) {
       return false;
     }
-    String comment = migrationConfig.isIncludeGeneratedFileComment() ? GENERATED_COMMENT : null;
+    String comment = Boolean.TRUE.equals(includeGeneratedFileComment) ? GENERATED_COMMENT : null;
     MigrationXmlWriter xmlWriter = new MigrationXmlWriter(comment);
     xmlWriter.write(dbMigration, file);
     return true;
@@ -586,21 +606,66 @@ public class DefaultDbMigration implements DbMigration {
       if (header != null) {
         migrationConfig.setDdlHeader(header);
       }
-      if (includeGeneratedFileComment != null) {
-        migrationConfig.setIncludeGeneratedFileComment(includeGeneratedFileComment);
-      }
-      if (version != null) {
-        migrationConfig.setVersion(version);
-      }
-      if (name != null) {
-        migrationConfig.setName(name);
-      }
-      if (generatePendingDrop != null) {
-        migrationConfig.setGeneratePendingDrop(generatePendingDrop);
-      }
     }
   }
 
+  /**
+   * Return the migration version (typically FlywayDb compatible).
+   * <p>
+   * Example: 1.1.1_2
+   * <p>
+   * The version is expected to be the combination of the current pom version plus
+   * a 'feature' id. The combined version must be unique and ordered to work with
+   * FlywayDb so each developer sets a unique version so that the migration script
+   * generated is unique (typically just prior to being submitted as a merge request).
+   */
+  private String getVersion() {
+    String envVersion = readEnvironment("ddl.migration.version");
+    if (!isEmpty(envVersion)) {
+      return envVersion.trim();
+    }
+    return version;
+  }
+
+  /**
+   * Return the migration name which is short description text that can be appended to
+   * the migration version to become the ddl script file name.
+   * <p>
+   * So if the name is "a foo table" then the ddl script file could be:
+   * "1.1.1_2__a-foo-table.sql"
+   * </p>
+   * <p>
+   * When the DB migration relates to a git feature (merge request) then this description text
+   * is a short description of the feature.
+   * </p>
+   */
+  private String getName() {
+    String envName = readEnvironment("ddl.migration.name");
+    if (!isEmpty(envName)) {
+      return envName.trim();
+    }
+    return name;
+  }
+
+  /**
+   * Return true if the string is null or empty.
+   */
+  private boolean isEmpty(String val) {
+    return val == null || val.trim().isEmpty();
+  }
+
+  /**
+   * Return the system or environment property.
+   */
+  private String readEnvironment(String key) {
+
+    String val = System.getProperty(key);
+    if (val == null) {
+      val = System.getenv(key);
+    }
+    return val;
+  }
+
   /**
    * Return the file path to write the xml and sql to.
    */
@@ -662,6 +727,8 @@ public class DefaultDbMigration implements DbMigration {
         return new DB2Platform();
       case SQLITE:
         return new SQLitePlatform();
+      case HANA:
+        return new HanaPlatform();
       case GENERIC:
         return new DatabasePlatform();
 

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/BaseDdlHandler.java

@@ -28,7 +28,11 @@ public class BaseDdlHandler implements DdlHandler {
   protected final TableDdl tableDdl;
 
   public BaseDdlHandler(ServerConfig serverConfig, PlatformDdl platformDdl) {
-    this.tableDdl = new BaseTableDdl(serverConfig, platformDdl);
+    this(serverConfig, platformDdl, new BaseTableDdl(serverConfig, platformDdl));
+  }
+  
+  protected BaseDdlHandler(ServerConfig serverConfig, PlatformDdl platformDdl, TableDdl tableDdl) {
+    this.tableDdl = tableDdl;
   }
 
   @Override

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/AbstractHanaDdl.java

@@ -0,0 +1,225 @@
+package io.ebeaninternal.dbmigration.ddlgeneration.platform;
+
+import io.ebean.config.ServerConfig;
+import io.ebean.config.dbplatform.DatabasePlatform;
+import io.ebean.config.dbplatform.DbPlatformType;
+import io.ebeaninternal.dbmigration.ddlgeneration.DdlBuffer;
+import io.ebeaninternal.dbmigration.ddlgeneration.DdlHandler;
+import io.ebeaninternal.dbmigration.migration.AlterColumn;
+
+import java.io.IOException;
+import java.util.Objects;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public abstract class AbstractHanaDdl extends PlatformDdl {
+
+  private static final Pattern ARRAY_PATTERN = Pattern.compile("(\\w+)\\s*\\[\\s*\\]\\s*(\\(\\d+\\))?", Pattern.CASE_INSENSITIVE);
+
+  public AbstractHanaDdl(DatabasePlatform platform) {
+    super(platform);
+    this.addColumn = "add (";
+    this.addColumnSuffix = ")";
+    this.alterColumn = "alter (";
+    this.alterColumnSuffix = ")";
+    this.columnDropDefault = " default null";
+    this.columnSetDefault = " default";
+    this.columnSetNotnull = " not null";
+    this.columnSetNull = " null";
+    this.dropColumn = "drop (";
+    this.dropColumnSuffix = ")";
+    this.dropConstraintIfExists = "drop constraint ";
+    this.dropIndexIfExists = "drop index ";
+    this.dropSequenceIfExists = "drop sequence ";
+    this.dropTableCascade = " cascade";
+    this.dropTableIfExists = "drop table ";
+    this.fallbackArrayType = "nvarchar(1000)";
+    this.historyDdl = new HanaHistoryDdl();
+    this.identitySuffix = " generated by default as identity";
+  }
+
+  @Override
+  public String alterColumnBaseAttributes(AlterColumn alter) {
+    String tableName = alter.getTableName();
+    String columnName = alter.getColumnName();
+    String currentType = alter.getCurrentType();
+    String type = alter.getType() != null ? alter.getType() : currentType;
+    type = convert(type, false);
+    currentType = convert(currentType, false);
+    boolean notnull = (alter.isNotnull() != null) ? alter.isNotnull() : Boolean.TRUE.equals(alter.isCurrentNotnull());
+    String notnullClause = notnull ? " not null" : "";
+    String defaultValue = DdlHelp.isDropDefault(alter.getDefaultValue()) ? "null"
+      : (alter.getDefaultValue() != null ? alter.getDefaultValue() : alter.getCurrentDefaultValue());
+    String defaultValueClause = (defaultValue == null || defaultValue.isEmpty()) ? "" : " default " + defaultValue;
+
+    try {
+      DdlBuffer buffer = new BaseDdlBuffer(null);
+      if (!isConvertible(currentType, type)) {
+        // add an intermediate conversion if possible
+        if (isNumberType(currentType)) {
+          // numbers can always be converted to decimal
+          buffer.append("alter table ").append(tableName).append(" ").append(alterColumn).append(" ").append(columnName)
+            .append(" decimal ").append(defaultValueClause).append(notnullClause).append(alterColumnSuffix)
+            .endOfStatement();
+
+        } else if (isStringType(currentType)) {
+          // strings can always be converted to nclob
+          buffer.append("alter table ").append(tableName).append(" ").append(alterColumn).append(" ").append(columnName)
+            .append(" nclob ").append(defaultValueClause).append(notnullClause).append(alterColumnSuffix)
+            .endOfStatement();
+        }
+      }
+
+      buffer.append("alter table ").append(tableName).append(" ").append(alterColumn).append(" ").append(columnName)
+        .append(" ").append(type).append(defaultValueClause).append(notnullClause).append(alterColumnSuffix);
+
+      return buffer.getBuffer();
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  @Override
+  public String alterColumnDefaultValue(String tableName, String columnName, String defaultValue) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public String alterColumnNotnull(String tableName, String columnName, boolean notnull) {
+    return null;
+  }
+
+  @Override
+  public DdlHandler createDdlHandler(ServerConfig serverConfig) {
+    return new HanaDdlHandler(serverConfig, this);
+  }
+
+  @Override
+  public String alterColumnType(String tableName, String columnName, String type) {
+    return null;
+  }
+
+  @Override
+  protected String convertArrayType(String logicalArrayType) {
+    Matcher matcher = ARRAY_PATTERN.matcher(logicalArrayType);
+    if (matcher.matches()) {
+      return convert(matcher.group(1), false) + " array" + (matcher.group(2) == null ? "" : matcher.group(2));
+    } else {
+      return fallbackArrayType;
+    }
+  }
+
+  @Override
+  public String alterTableAddUniqueConstraint(String tableName, String uqName, String[] columns, String[] nullableColumns) {
+    if (nullableColumns == null || nullableColumns.length == 0) {
+      return super.alterTableAddUniqueConstraint(tableName, uqName, columns, nullableColumns);
+    } else {
+      return "-- cannot create unique index \"" + uqName + "\" on table \"" + tableName + "\" with nullable columns";
+    }
+  }
+
+  @Override
+  public String alterTableDropUniqueConstraint(String tableName, String uniqueConstraintName) {
+    DdlBuffer buffer = new BaseDdlBuffer(null);
+    try {
+      buffer.append("delimiter $$").newLine();
+      buffer.append("do").newLine();
+      buffer.append("begin").newLine();
+      buffer.append("declare exit handler for sql_error_code 397 begin end").endOfStatement();
+      buffer.append("exec 'alter table ").append(tableName).append(" ").append(dropUniqueConstraint).append(" ")
+        .append(maxConstraintName(uniqueConstraintName)).append("'").endOfStatement();
+      buffer.append("end").endOfStatement();
+      buffer.append("$$");
+      return buffer.getBuffer();
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  @Override
+  public String alterTableDropConstraint(String tableName, String constraintName) {
+    return alterTableDropUniqueConstraint(tableName, constraintName);
+  }
+
+  /**
+   * It is rather complex to delete a column on HANA as there must not exist any
+   * foreign keys. That's why we call a user stored procedure here
+   */
+  @Override
+  public void alterTableDropColumn(DdlBuffer buffer, String tableName, String columnName) throws IOException {
+    buffer.append("CALL usp_ebean_drop_column('").append(tableName).append("', '").append(columnName).append("')")
+      .endOfStatement();
+  }
+
+  /**
+   * Check if a data type can be converted to another data type. Data types can't
+   * be converted if the target type has a lower precision than the source type.
+   *
+   * @param sourceType The source data type
+   * @param targetType the target data type
+   * @return {@code true} if the type can be converted, {@code false} otherwise
+   */
+  private boolean isConvertible(String sourceType, String targetType) {
+    if (Objects.equals(sourceType, targetType)) {
+      return true;
+    }
+
+    if (sourceType == null || targetType == null) {
+      return true;
+    }
+
+    if ("bigint".equals(sourceType)) {
+      if ("integer".equals(targetType) || "smallint".equals(targetType) || "tinyint".equals(targetType)) {
+        return false;
+      }
+    } else if ("integer".equals(sourceType)) {
+      if ("smallint".equals(targetType) || "tinyint".equals(targetType)) {
+        return false;
+      }
+    } else if ("smallint".equals(sourceType)) {
+      if ("tinyint".equals(targetType)) {
+        return false;
+      }
+    } else if ("double".equals(sourceType)) {
+      if ("real".equals(targetType)) {
+        return false;
+      }
+    }
+
+    DbPlatformType dbPlatformSourceType = DbPlatformType.parse(sourceType);
+
+    if ("float".equals(dbPlatformSourceType.getName())) {
+      if ("real".equals(targetType)) {
+        return false;
+      }
+    } else if ("varchar".equals(dbPlatformSourceType.getName()) || "nvarchar".equals(dbPlatformSourceType.getName())) {
+      DbPlatformType dbPlatformTargetType = DbPlatformType.parse(targetType);
+      if ("varchar".equals(dbPlatformTargetType.getName()) || "nvarchar".equals(dbPlatformTargetType.getName())) {
+        if (dbPlatformSourceType.getDefaultLength() > dbPlatformTargetType.getDefaultLength()) {
+          return false;
+        }
+      }
+    } else if ("decimal".equals(dbPlatformSourceType.getName())) {
+      DbPlatformType dbPlatformTargetType = DbPlatformType.parse(targetType);
+      if ("decimal".equals(dbPlatformTargetType.getName())) {
+        if (dbPlatformSourceType.getDefaultLength() > dbPlatformTargetType.getDefaultLength()
+          || dbPlatformSourceType.getDefaultScale() > dbPlatformTargetType.getDefaultScale()) {
+          return false;
+        }
+      }
+    }
+
+    return true;
+  }
+
+  private boolean isNumberType(String type) {
+    return type != null
+      && ("bigint".equals(type) || "integer".equals(type) || "smallint".equals(type) || "tinyint".equals(type)
+      || type.startsWith("float") || "real".equals(type) || "double".equals(type) || type.startsWith("decimal"));
+  }
+
+  private boolean isStringType(String type) {
+    return type != null
+      && (type.startsWith("varchar") || type.startsWith("nvarchar") || "clob".equals(type) || "nclob".equals(type));
+  }
+}

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/BaseTableDdl.java

@@ -260,7 +260,7 @@ public class BaseTableDdl implements TableDdl {
     String partitionMode = createTable.getPartitionMode();
 
     DdlBuffer apply = writer.apply();
-    apply.append("create table ").append(tableName).append(" (");
+    apply.append(platformDdl.getCreateTableCommandPrefix()).append(" ").append(tableName).append(" (");
     writeTableColumns(apply, columns, useIdentity);
     writeCheckConstraints(apply, createTable);
     writeUniqueConstraints(apply, createTable);

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/DbTriggerBasedHistoryDdl.java

@@ -175,7 +175,7 @@ public abstract class DbTriggerBasedHistoryDdl implements PlatformHistoryDdl {
 
   protected void createHistoryTable(DdlBuffer apply, MTable table) throws IOException {
 
-    apply.append("create table ").append(table.getName()).append(historySuffix).append("(").newLine();
+    apply.append(platformDdl.getCreateTableCommandPrefix()).append(" ").append(table.getName()).append(historySuffix).append("(").newLine();
 
     Collection<MColumn> cols = table.allColumns();
     for (MColumn column : cols) {
@@ -238,8 +238,8 @@ public abstract class DbTriggerBasedHistoryDdl implements PlatformHistoryDdl {
   }
 
   protected void dropSysPeriodColumns(DdlBuffer buffer, String baseTableName) throws IOException {
-    buffer.append("alter table ").append(baseTableName).append(" drop column ").append(sysPeriodStart).endOfStatement();
-    buffer.append("alter table ").append(baseTableName).append(" drop column ").append(sysPeriodEnd).endOfStatement();
+    platformDdl.alterTableDropColumn(buffer, baseTableName, sysPeriodStart);
+    platformDdl.alterTableDropColumn(buffer, baseTableName, sysPeriodEnd);
   }
 
   protected void appendInsertIntoHistory(DdlBuffer buffer, String historyTable, List<String> columns) throws IOException {

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/HanaColumnStoreDdl.java

@@ -0,0 +1,51 @@
+package io.ebeaninternal.dbmigration.ddlgeneration.platform;
+
+import java.io.IOException;
+
+import io.ebean.config.dbplatform.DatabasePlatform;
+import io.ebeaninternal.dbmigration.ddlgeneration.DdlBuffer;
+
+public class HanaColumnStoreDdl extends AbstractHanaDdl {
+
+  public HanaColumnStoreDdl(DatabasePlatform platform) {
+    super(platform);
+    this.createTable = "create column table";
+  }
+
+  @Override
+  public String createIndex(String indexName, String tableName, String[] columns) {
+    if (columns == null || columns.length == 0) {
+      return "-- cannot create index: no columns given";
+    }
+
+    if (columns.length == 1) {
+      return "-- explicit index \"" + indexName + "\" for single column \"" + columns[0] + "\" of table \"" + tableName
+          + "\" is not necessary";
+    }
+
+    StringBuilder buffer = new StringBuilder();
+    buffer.append("create inverted hash index ").append(maxConstraintName(indexName)).append(" on ").append(tableName);
+    appendColumns(columns, buffer);
+
+    return buffer.toString();
+  }
+
+  @Override
+  public String dropIndex(String indexName, String tableName) {
+    DdlBuffer buffer = new BaseDdlBuffer(null);
+    try {
+      buffer.append("delimiter $$").newLine();
+      buffer.append("do").newLine();
+      buffer.append("begin").newLine();
+      buffer.append("declare exit handler for sql_error_code 261 begin end").endOfStatement();
+      buffer.append("exec '").append(dropIndexIfExists).append(maxConstraintName(indexName)).append("'")
+          .endOfStatement();
+      buffer.append("end").endOfStatement();
+      buffer.append("$$");
+      return buffer.getBuffer();
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+}

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/HanaDdlHandler.java

@@ -0,0 +1,11 @@
+package io.ebeaninternal.dbmigration.ddlgeneration.platform;
+
+import io.ebean.config.ServerConfig;
+import io.ebeaninternal.dbmigration.ddlgeneration.BaseDdlHandler;
+
+public class HanaDdlHandler extends BaseDdlHandler {
+
+  public HanaDdlHandler(ServerConfig serverConfig, PlatformDdl platformDdl) {
+    super(serverConfig, platformDdl, new HanaTableDdl(serverConfig, platformDdl));
+  }
+}

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/HanaHistoryDdl.java

@@ -0,0 +1,157 @@
+package io.ebeaninternal.dbmigration.ddlgeneration.platform;
+
+import io.ebean.config.ServerConfig;
+import io.ebeaninternal.dbmigration.ddlgeneration.DdlBuffer;
+import io.ebeaninternal.dbmigration.ddlgeneration.DdlWrite;
+import io.ebeaninternal.dbmigration.migration.AddHistoryTable;
+import io.ebeaninternal.dbmigration.migration.DropHistoryTable;
+import io.ebeaninternal.dbmigration.model.MColumn;
+import io.ebeaninternal.dbmigration.model.MTable;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class HanaHistoryDdl implements PlatformHistoryDdl {
+
+  private String systemPeriodStart;
+  private String systemPeriodEnd;
+  private PlatformDdl platformDdl;
+  private String historySuffix;
+  private final AtomicInteger counter = new AtomicInteger(0);
+  private Map<String, String> createdHistoryTables = new ConcurrentHashMap<>();
+
+  @Override
+  public void configure(ServerConfig serverConfig, PlatformDdl platformDdl) {
+    this.systemPeriodStart = serverConfig.getAsOfSysPeriod() + "_start";
+    this.systemPeriodEnd = serverConfig.getAsOfSysPeriod() + "_end";
+    this.platformDdl = platformDdl;
+    this.historySuffix = serverConfig.getHistoryTableSuffix();
+  }
+
+  @Override
+  public void createWithHistory(DdlWrite writer, MTable table) throws IOException {
+    String tableName = table.getName();
+    String historyTableName = tableName + historySuffix;
+    DdlBuffer apply = writer.applyHistoryView();
+    if (apply.isEmpty()) {
+      createdHistoryTables.clear();
+    }
+
+    apply.append(platformDdl.getCreateTableCommandPrefix()).append(" ").append(historyTableName).append(" (").newLine();
+
+    // create history table
+    Collection<MColumn> cols = table.allColumns();
+    for (MColumn column : cols) {
+      if (!column.isDraftOnly()) {
+        writeColumnDefinition(apply, column.getName(), column.getType(), column.getDefaultValue(), column.isNotnull(),
+          column.isIdentity() ? platformDdl.identitySuffix : null);
+        apply.append(",").newLine();
+      }
+    }
+    writeColumnDefinition(apply, systemPeriodStart, "TIMESTAMP", null, false, null);
+    apply.append(",").newLine();
+    writeColumnDefinition(apply, systemPeriodEnd, "TIMESTAMP", null, false, null);
+    apply.newLine().append(")").endOfStatement();
+
+    // enable system versioning
+    apply.append("alter table ").append(tableName).append(" add (").newLine();
+    apply.append("    ").append(systemPeriodStart).append(" TIMESTAMP NOT NULL GENERATED ALWAYS AS ROW START, ").newLine();
+    apply.append("    ").append(systemPeriodEnd).append(" TIMESTAMP NOT NULL GENERATED ALWAYS AS ROW END").newLine();
+    apply.append(")").endOfStatement();
+
+    apply.append("alter table ").append(tableName).append(" add period for system_time(").append(systemPeriodStart)
+      .append(",").append(systemPeriodEnd).append(")").endOfStatement();
+
+    enableSystemVersioning(apply, tableName, historyTableName, true, false);
+
+    createdHistoryTables.put(tableName, historyTableName);
+
+    dropHistoryTable(writer.dropAll(), tableName, historyTableName);
+  }
+
+  @Override
+  public void dropHistoryTable(DdlWrite writer, DropHistoryTable dropHistoryTable) throws IOException {
+    dropHistoryTable(writer.applyDropDependencies(), dropHistoryTable.getBaseTable(),
+      dropHistoryTable.getBaseTable() + historySuffix);
+  }
+
+  protected void dropHistoryTable(DdlBuffer apply, String baseTable, String historyTable) throws IOException {
+    // disable system versioning
+    disableSystemVersioning(apply, baseTable);
+
+    apply.append("alter table ").append(baseTable).append(" drop period for system_time").endOfStatement();
+
+    // drop the period columns
+    apply.append("alter table ").append(baseTable).append(" drop (").append(systemPeriodStart).append(",")
+      .append(systemPeriodEnd).append(")").endOfStatement();
+
+    // drop the history table
+    apply.append("drop table ").append(historyTable).append(" cascade").endOfStatement();
+  }
+
+  @Override
+  public void addHistoryTable(DdlWrite writer, AddHistoryTable addHistoryTable) throws IOException {
+    MTable table = writer.getTable(addHistoryTable.getBaseTable());
+    if (table == null) {
+      throw new IllegalStateException("MTable " + addHistoryTable.getBaseTable() + " not found in writer? (required for history DDL)");
+    }
+    createWithHistory(writer, table);
+  }
+
+  @Override
+  public void updateTriggers(DdlWrite write, HistoryTableUpdate baseTable) {
+    // nothing to do
+  }
+
+  protected void writeColumnDefinition(DdlBuffer buffer, String columnName, String type, String defaultValue,
+                                       boolean isNotNull, String generated) throws IOException {
+
+    String platformType = platformDdl.convert(type, false);
+    buffer.append(" ").append(platformDdl.lowerColumnName(columnName));
+    buffer.append(" ").append(platformType);
+    if (defaultValue != null) {
+      buffer.append(" default ").append(defaultValue);
+    }
+    if (isNotNull) {
+      buffer.append(" not null");
+    }
+    if (generated != null) {
+      buffer.append(" ").append(generated);
+    }
+  }
+
+  public void disableSystemVersioning(DdlBuffer apply, String tableName) throws IOException {
+    disableSystemVersioning(apply, tableName, false);
+  }
+
+  public void disableSystemVersioning(DdlBuffer apply, String tableName, boolean uniqueStatement) throws IOException {
+    apply.append("alter table ").append(tableName).append(" drop system versioning");
+    if (uniqueStatement) {
+      // needed for the DB migration test to prevent the statement from being filtered
+      // out as a duplicate
+      apply.append(" /* ").append(String.valueOf(counter.getAndIncrement())).append(" */");
+    }
+    apply.endOfStatement();
+  }
+
+  public void enableSystemVersioning(DdlBuffer apply, String tableName, String historyTableName, boolean validated,
+                                     boolean uniqueStatement) throws IOException {
+    apply.append("alter table ").append(tableName).append(" add system versioning history table ").append(historyTableName);
+    if (!validated) {
+      apply.append(" not validated");
+    }
+    if (uniqueStatement) {
+      // needed for the DB migration test to prevent the statement from being filtered
+      // out as a duplicate
+      apply.append(" /* ").append(String.valueOf(counter.getAndIncrement())).append(" */");
+    }
+    apply.endOfStatement();
+  }
+
+  public boolean isSystemVersioningEnabled(String tableName) {
+    return !createdHistoryTables.containsKey(tableName);
+  }
+}

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/HanaRowStoreDdl.java

@@ -0,0 +1,11 @@
+package io.ebeaninternal.dbmigration.ddlgeneration.platform;
+
+import io.ebean.config.dbplatform.DatabasePlatform;
+
+public class HanaRowStoreDdl extends AbstractHanaDdl {
+
+  public HanaRowStoreDdl(DatabasePlatform platform) {
+    super(platform);
+    this.createTable = "create row table";
+  }
+}

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/HanaTableDdl.java

@@ -0,0 +1,134 @@
+package io.ebeaninternal.dbmigration.ddlgeneration.platform;
+
+import java.io.IOException;
+import java.util.List;
+
+import io.ebean.config.PropertiesWrapper;
+import io.ebean.config.ServerConfig;
+import io.ebeaninternal.dbmigration.ddlgeneration.DdlWrite;
+import io.ebeaninternal.dbmigration.migration.AddColumn;
+import io.ebeaninternal.dbmigration.migration.AlterColumn;
+import io.ebeaninternal.dbmigration.migration.Column;
+import io.ebeaninternal.dbmigration.migration.DropColumn;
+import io.ebeaninternal.dbmigration.model.MTable;
+
+public class HanaTableDdl extends BaseTableDdl {
+
+  private final HanaHistoryDdl historyDdl;
+  private final boolean generateUniqueDdl;
+
+  public HanaTableDdl(ServerConfig serverConfig, PlatformDdl platformDdl) {
+    super(serverConfig, platformDdl);
+    this.historyDdl = (HanaHistoryDdl) platformDdl.historyDdl;
+    if (serverConfig.getProperties() != null) {
+      PropertiesWrapper wrapper = new PropertiesWrapper("ebean", "hana", serverConfig.getProperties(), serverConfig.getClassLoadConfig());
+      this.generateUniqueDdl = wrapper.getBoolean("generateUniqueDdl", false);
+    } else {
+      this.generateUniqueDdl = false;
+    }
+  }
+
+  @Override
+  protected void alterColumnDefaultValue(DdlWrite writer, AlterColumn alter) throws IOException {
+    String ddl = platformDdl.alterColumnBaseAttributes(alter);
+    if (hasValue(ddl)) {
+      writer.apply().append(ddl).endOfStatement();
+    }
+  }
+
+  @Override
+  public void generate(DdlWrite writer, AddColumn addColumn) throws IOException {
+    String tableName = addColumn.getTableName();
+    MTable table = writer.getTable(tableName);
+    if (table == null) {
+      super.generate(writer, addColumn);
+      return;
+    }
+
+    boolean manageSystemVersioning = isTrue(table.isWithHistory()) && historyDdl.isSystemVersioningEnabled(tableName);
+
+    if (manageSystemVersioning) {
+      historyDdl.disableSystemVersioning(writer.apply(), table.getName(), this.generateUniqueDdl);
+    }
+
+    super.generate(writer, addColumn);
+
+    if (manageSystemVersioning) {
+      // make same changes to the history table
+      String historyTable = historyTable(tableName);
+      List<Column> columns = addColumn.getColumn();
+      for (Column column : columns) {
+        alterTableAddColumn(writer.apply(), historyTable, column, true, true);
+      }
+
+      historyDdl.enableSystemVersioning(writer.apply(), table.getName(), historyTable, false, this.generateUniqueDdl);
+    }
+  }
+
+  @Override
+  public void generate(DdlWrite writer, AlterColumn alterColumn) throws IOException {
+    String tableName = alterColumn.getTableName();
+    MTable table = writer.getTable(tableName);
+    if (table == null) {
+      super.generate(writer, alterColumn);
+      return;
+    }
+
+    boolean manageSystemVersioning = isTrue(table.isWithHistory()) && historyDdl.isSystemVersioningEnabled(tableName);
+
+    if (manageSystemVersioning) {
+      historyDdl.disableSystemVersioning(writer.apply(), tableName, this.generateUniqueDdl);
+    }
+
+    super.generate(writer, alterColumn);
+
+    if (manageSystemVersioning) {
+      // make same changes to the history table
+      String historyTable = historyTable(tableName);
+      if (hasValue(alterColumn.getType()) || hasValue(alterColumn.getDefaultValue()) || alterColumn.isNotnull() != null) {
+        AlterColumn alterHistoryColumn = new AlterColumn();
+        alterHistoryColumn.setTableName(historyTable);
+        alterHistoryColumn.setColumnName(alterColumn.getColumnName());
+        alterHistoryColumn.setType(alterColumn.getType());
+        alterHistoryColumn.setDefaultValue(alterColumn.getDefaultValue());
+        alterHistoryColumn.setNotnull(alterColumn.isNotnull());
+        alterHistoryColumn.setCurrentType(alterColumn.getCurrentType());
+        alterHistoryColumn.setCurrentDefaultValue(alterColumn.getCurrentDefaultValue());
+        alterHistoryColumn.setCurrentNotnull(alterColumn.isCurrentNotnull());
+        String histColumnDdl = platformDdl.alterColumnBaseAttributes(alterHistoryColumn);
+
+        // write the apply to history table
+        writer.apply().append(histColumnDdl).endOfStatement();
+      }
+
+      historyDdl.enableSystemVersioning(writer.apply(), tableName, historyTable, false, this.generateUniqueDdl);
+    }
+  }
+
+  @Override
+  public void generate(DdlWrite writer, DropColumn dropColumn) throws IOException {
+    String tableName = dropColumn.getTableName();
+    MTable table = writer.getTable(tableName);
+    if (table == null) {
+      super.generate(writer, dropColumn);
+      return;
+    }
+
+    boolean manageSystemVersioning = isTrue(table.isWithHistory()) && historyDdl.isSystemVersioningEnabled(tableName);
+
+    if (manageSystemVersioning) {
+      historyDdl.disableSystemVersioning(writer.apply(), tableName, this.generateUniqueDdl);
+    }
+
+    super.generate(writer, dropColumn);
+
+    if (manageSystemVersioning) {
+      // also drop from the history table
+      String historyTable = historyTable(tableName);
+      alterTableDropColumn(writer.apply(), historyTable, dropColumn.getColumnName());
+
+      historyDdl.enableSystemVersioning(writer.apply(), tableName, historyTable, false, this.generateUniqueDdl);
+    }
+  }
+
+}

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/PlatformDdl.java

@@ -78,12 +78,16 @@ public class PlatformDdl {
   protected String dropIndexIfExists = "drop index if exists ";
 
   protected String alterColumn = "alter column";
+  
+  protected String alterColumnSuffix = "";
 
   protected String dropUniqueConstraint = "drop constraint";
 
   protected String addConstraint = "add constraint";
 
   protected String addColumn = "add column";
+  
+  protected String addColumnSuffix = "";
 
   protected String columnSetType = "";
 
@@ -96,6 +100,12 @@ public class PlatformDdl {
   protected String columnSetNull = "set null";
 
   protected String updateNullWithDefault = "update ${table} set ${column} = ${default} where ${column} is null";
+  
+  protected String createTable = "create table";
+  
+  protected String dropColumn = "drop column";
+  
+  protected String dropColumnSuffix = "";
 
   /**
    * Set false for MsSqlServer to allow multiple nulls for OneToOne mapping.
@@ -458,6 +468,7 @@ public class PlatformDdl {
       if (isTrue(column.isNotnull())) {
         buffer.append(" not null");
       }
+      buffer.append(addColumnSuffix);
       buffer.endOfStatement();
 
       // check constraints cannot be added in one statement for h2
@@ -467,14 +478,15 @@ public class PlatformDdl {
         buffer.append(ddl).endOfStatement();
       }
     } else {
+      buffer.append(addColumnSuffix);
       buffer.endOfStatement();
     }
 
   }
 
   public void alterTableDropColumn(DdlBuffer buffer, String tableName, String columnName) throws IOException {
-    buffer.append("alter table ").append(tableName).append(" drop column ").append(columnName)
-    .endOfStatement();
+    buffer.append("alter table ").append(tableName).append(" ").append(dropColumn).append(" ").append(columnName)
+    .append(dropColumnSuffix).endOfStatement();
   }
 
   /**
@@ -494,19 +506,19 @@ public class PlatformDdl {
    */
   public String alterColumnType(String tableName, String columnName, String type) {
 
-    return "alter table " + tableName + " " + alterColumn + " " + columnName + " " + columnSetType + convert(type, false);
+    return "alter table " + tableName + " " + alterColumn + " " + columnName + " " + columnSetType + convert(type, false) + alterColumnSuffix;
   }
 
   /**
    * Alter a column adding or removing the not null constraint.
    * <p>
-   * Note that that MySql and SQL Server instead use alterColumnBaseAttributes()
+   * Note that that MySql, SQL Server, and HANA instead use alterColumnBaseAttributes()
    * </p>
    */
   public String alterColumnNotnull(String tableName, String columnName, boolean notnull) {
 
     String suffix = notnull ? columnSetNotnull : columnSetNull;
-    return "alter table " + tableName + " " + alterColumn + " " + columnName + " " + suffix;
+    return "alter table " + tableName + " " + alterColumn + " " + columnName + " " + suffix + alterColumnSuffix;
   }
 
   /**
@@ -522,17 +534,17 @@ public class PlatformDdl {
    */
   public String alterColumnDefaultValue(String tableName, String columnName, String defaultValue) {
     String suffix = DdlHelp.isDropDefault(defaultValue) ? columnDropDefault : columnSetDefault + " " + convertDefaultValue(defaultValue);
-    return "alter table " + tableName + " " + alterColumn + " " + columnName + " " + suffix;
+    return "alter table " + tableName + " " + alterColumn + " " + columnName + " " + suffix + alterColumnSuffix;
   }
 
   /**
    * Alter column setting both the type and not null constraint.
    * <p>
-   * Used by MySql and SQL Server as these require both column attributes to be set together.
+   * Used by MySql, SQL Server, and HANA as these require both column attributes to be set together.
    * </p>
    */
   public String alterColumnBaseAttributes(AlterColumn alter) {
-    // by default do nothing, only used by mysql and sql server as they can only
+    // by default do nothing, only used by mysql, sql server, and HANA as they can only
     // modify the column with the full column definition
     return null;
   }
@@ -662,6 +674,17 @@ public class PlatformDdl {
   public void unlockTables(DdlBuffer buffer, Collection<String> tables) throws IOException {
 
   }
+  
+  /**
+   * Returns the database-specific "create table" command prefix. For HANA this is
+   * either "create column table" or "create row table", for all other databases
+   * it is "create table".
+   * 
+   * @return The "create table" command prefix
+   */
+  public String getCreateTableCommandPrefix() {
+    return createTable;
+  }
 
   public boolean suppressPrimaryKeyOnPartition() {
     return false;

src/main/java/io/ebeaninternal/dbmigration/model/CurrentModel.java

@@ -29,6 +29,8 @@ public class CurrentModel {
 
   private final boolean platformTypes;
 
+  private final boolean jaxbPresent;
+
   private ModelContainer model;
 
   private ChangeSet changeSet;
@@ -58,6 +60,7 @@ public class CurrentModel {
     this.constraintNaming = constraintNaming;
     this.maxLength = maxLength(server, constraintNaming);
     this.platformTypes = platformTypes;
+    this.jaxbPresent = server.getServerConfig().getClassLoadConfig().isJavaxJAXBPresent();
   }
 
   /**
@@ -130,7 +133,9 @@ public class CurrentModel {
       ddl.append(header).append('\n');
     }
 
-    addExtraDdl(ddl, ExtraDdlXmlReader.readBuiltin(), "-- init script ");
+    if (jaxbPresent) {
+      addExtraDdl(ddl, ExtraDdlXmlReader.readBuiltin(), "-- init script ");
+    }
 
     ddl.append(write.apply().getBuffer());
     ddl.append(write.applyForeignKeys().getBuffer());

src/main/java/io/ebeaninternal/dbmigration/model/ModelContainer.java

@@ -184,13 +184,12 @@ public class ModelContainer {
   /**
    * Unset the withHistory flag on the associated base table.
    */
-  private void applyChange(DropHistoryTable change) {
+  protected void applyChange(DropHistoryTable change) {
 
     MTable table = tables.get(change.getBaseTable());
-    if (table == null) {
-      throw new IllegalStateException("Table [" + change.getBaseTable() + "] does not exist in model?");
+    if (table != null) {
+      table.setWithHistory(false);
     }
-    table.setWithHistory(false);
   }
 
   private void applyChange(AddUniqueConstraint change) {
@@ -241,19 +240,14 @@ public class ModelContainer {
     if (tables.containsKey(tableName)) {
       throw new IllegalStateException("Table [" + tableName + "] already exists in model?");
     }
-    MTable table = new MTable(createTable);
-    tables.put(tableName, table);
+    tables.put(tableName, new MTable(createTable));
   }
 
   /**
    * Apply a DropTable change to the model.
    */
   protected void applyChange(DropTable dropTable) {
-    String tableName = dropTable.getName();
-    if (!tables.containsKey(tableName)) {
-      throw new IllegalStateException("Table [" + tableName + "] does not exists in model?");
-    }
-    tables.remove(tableName);
+    tables.remove(dropTable.getName());
   }
 
   /**
@@ -264,22 +258,16 @@ public class ModelContainer {
     if (indexes.containsKey(indexName)) {
       throw new IllegalStateException("Index [" + indexName + "] already exists in model?");
     }
-    MIndex index = new MIndex(createIndex);
-    indexes.put(createIndex.getIndexName(), index);
+    indexes.put(createIndex.getIndexName(), new MIndex(createIndex));
   }
 
   /**
    * Apply a DropTable change to the model.
    */
   protected void applyChange(DropIndex dropIndex) {
-    String name = dropIndex.getIndexName();
-    if (!indexes.containsKey(name)) {
-      throw new IllegalStateException("Index [" + name + "] does not exist in model?");
-    }
-    indexes.remove(name);
+    indexes.remove(dropIndex.getIndexName());
   }
 
-
   /**
    * Apply a AddColumn change to the model.
    */

src/main/java/io/ebeaninternal/dbmigration/model/build/ModelBuildElementTable.java

@@ -24,9 +24,6 @@ public class ModelBuildElementTable {
 
     VisitAllUsing.visitOne(targetDescriptor, new ModelBuildPropertyVisitor(ctx, table, targetDescriptor));
 
-    ctx.fkeyBuilder(table)
-      .addForeignKey(manyProp.getBeanDescriptor(), manyProp.getTableJoin(), true);
-
     ctx.addTable(table);
   }
 

src/main/java/io/ebeaninternal/server/core/DatabasePlatformFactory.java

@@ -5,6 +5,7 @@ import io.ebean.config.dbplatform.DatabasePlatform;
 import io.ebean.config.dbplatform.cockroach.CockroachPlatform;
 import io.ebean.config.dbplatform.db2.DB2Platform;
 import io.ebean.config.dbplatform.h2.H2Platform;
+import io.ebean.config.dbplatform.hana.HanaPlatform;
 import io.ebean.config.dbplatform.hsqldb.HsqldbPlatform;
 import io.ebean.config.dbplatform.mysql.MySqlPlatform;
 import io.ebean.config.dbplatform.oracle.OraclePlatform;
@@ -106,6 +107,9 @@ public class DatabasePlatformFactory {
     if (dbName.equals("sqlite")) {
       return new SQLitePlatform();
     }
+    if (dbName.equals("hana")) {
+      return new HanaPlatform();
+    }
 
     throw new RuntimeException("database platform " + dbName + " is not known?");
   }
@@ -156,6 +160,8 @@ public class DatabasePlatformFactory {
       return new DB2Platform();
     } else if (dbProductName.contains("sql anywhere")) {
       return new SqlAnywherePlatform();
+    } else if (dbProductName.contains("hdb")) {
+      return new HanaPlatform();
     }
 
     // use the standard one

src/main/java/io/ebeaninternal/server/core/DefaultContainer.java

@@ -15,10 +15,10 @@ import io.ebeaninternal.server.cluster.ClusterManager;
 import io.ebeaninternal.server.core.bootup.BootupClassPathSearch;
 import io.ebeaninternal.server.core.bootup.BootupClasses;
 import io.ebeaninternal.server.lib.ShutdownManager;
-import org.avaje.datasource.DataSourceAlertFactory;
-import org.avaje.datasource.DataSourceConfig;
-import org.avaje.datasource.DataSourceFactory;
-import org.avaje.datasource.DataSourcePoolListener;
+import io.ebean.datasource.DataSourceAlertFactory;
+import io.ebean.datasource.DataSourceConfig;
+import io.ebean.datasource.DataSourceFactory;
+import io.ebean.datasource.DataSourcePoolListener;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 

src/main/java/io/ebeaninternal/server/core/DefaultServer.java

@@ -2054,6 +2054,11 @@ public final class DefaultServer implements SpiServer, SpiEbeanServer {
     return persister.executeSqlUpdate(updSql, t);
   }
 
+  @Override
+  public int executeNow(SpiSqlUpdate sqlUpdate) {
+    return persister.executeSqlUpdateNow(sqlUpdate, null);
+  }
+
   @Override
   public void addBatch(SpiSqlUpdate sqlUpdate, SpiTransaction transaction) {
     persister.addBatch(sqlUpdate, transaction);

src/main/java/io/ebeaninternal/server/core/DefaultSqlUpdate.java

@@ -133,6 +133,15 @@ public final class DefaultSqlUpdate implements Serializable, SpiSqlUpdate {
     }
   }
 
+  @Override
+  public int executeNow() {
+    if (server != null) {
+      return server.executeNow(this);
+    } else {
+      throw new IllegalStateException("server is null?");
+    }
+  }
+
   @Override
   public int[] executeBatch() {
     if (server == null) {

src/main/java/io/ebeaninternal/server/core/InternalConfiguration.java

@@ -87,7 +87,7 @@ import io.ebeanservice.docstore.api.DocStoreFactory;
 import io.ebeanservice.docstore.api.DocStoreIntegration;
 import io.ebeanservice.docstore.api.DocStoreUpdateProcessor;
 import io.ebeanservice.docstore.none.NoneDocStoreFactory;
-import org.avaje.datasource.DataSourcePool;
+import io.ebean.datasource.DataSourcePool;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 

src/main/java/io/ebeaninternal/server/core/MultiTenantDbCatalogSupplier.java

@@ -3,7 +3,7 @@ package io.ebeaninternal.server.core;
 import io.ebean.config.CurrentTenantProvider;
 import io.ebean.config.TenantCatalogProvider;
 import io.ebeaninternal.server.transaction.DataSourceSupplier;
-import org.avaje.datasource.DataSourcePool;
+import io.ebean.datasource.DataSourcePool;
 
 import javax.sql.DataSource;
 import java.io.PrintWriter;

src/main/java/io/ebeaninternal/server/core/MultiTenantDbSchemaSupplier.java

@@ -3,7 +3,7 @@ package io.ebeaninternal.server.core;
 import io.ebean.config.CurrentTenantProvider;
 import io.ebean.config.TenantSchemaProvider;
 import io.ebeaninternal.server.transaction.DataSourceSupplier;
-import org.avaje.datasource.DataSourcePool;
+import io.ebean.datasource.DataSourcePool;
 
 import javax.sql.DataSource;
 import java.io.PrintWriter;

src/main/java/io/ebeaninternal/server/core/PersistRequest.java

@@ -8,6 +8,9 @@ import io.ebeaninternal.server.persist.BatchPostExecute;
 import io.ebeaninternal.server.persist.BatchedSqlException;
 import io.ebeaninternal.server.persist.PersistExecute;
 
+import javax.persistence.PersistenceException;
+import java.sql.SQLException;
+
 /**
  * Wraps all the objects used to persist a bean.
  */
@@ -95,6 +98,13 @@ public abstract class PersistRequest extends BeanRequest implements BatchPostExe
     return transaction.isBatchThisRequest();
   }
 
+  /**
+   * Translate the SQLException into a specific exception given the platform.
+   */
+  public PersistenceException translateSqlException(SQLException e) {
+    return transaction.translate(e.getMessage(), e);
+  }
+
   /**
    * Execute the statement.
    */

src/main/java/io/ebeaninternal/server/core/PersistRequestBean.java

@@ -19,6 +19,7 @@ import io.ebeaninternal.server.deploy.BeanDescriptor;
 import io.ebeaninternal.server.deploy.BeanManager;
 import io.ebeaninternal.server.deploy.BeanProperty;
 import io.ebeaninternal.server.deploy.BeanPropertyAssocMany;
+import io.ebeaninternal.server.deploy.BeanPropertyAssocOne;
 import io.ebeaninternal.server.deploy.generatedproperty.GeneratedProperty;
 import io.ebeaninternal.server.deploy.id.ImportedId;
 import io.ebeaninternal.server.persist.BatchControl;
@@ -131,6 +132,11 @@ public final class PersistRequestBean<T> extends PersistRequest implements BeanP
    */
   private boolean[] dirtyProperties;
 
+  /**
+   * Imported OneToOne orphan that needs to be deleted.
+   */
+  private EntityBean orphanBean;
+
   /**
    * Flag set when request is added to JDBC batch.
    */
@@ -167,6 +173,16 @@ public final class PersistRequestBean<T> extends PersistRequest implements BeanP
    */
   private int pendingPostUpdateNotify;
 
+  /**
+   * Set to true when post execute has occured (so includes batch flush).
+   */
+  private boolean postExecute;
+
+  /**
+   * Set to true after many properties have been persisted (so includes element collections).
+   */
+  private boolean complete;
+
   public PersistRequestBean(SpiEbeanServer server, T bean, Object parentBean, BeanManager<T> mgr, SpiTransaction t,
                             PersistExecute persistExecute, PersistRequest.Type type, int flags) {
 
@@ -435,10 +451,10 @@ public final class PersistRequestBean<T> extends PersistRequest implements BeanP
   }
 
   /**
-   * Return true if this change should notify cache, listener or doc store.
+   * Return true if this change should notify persist listener or doc store (and keep the request).
    */
-  public boolean isNotify() {
-    return notifyCache || isNotifyPersistListener() || isDocStoreNotify();
+  private boolean isNotifyListeners() {
+    return isNotifyPersistListener() || isDocStoreNotify();
   }
 
   /**
@@ -912,7 +928,7 @@ public final class PersistRequestBean<T> extends PersistRequest implements BeanP
    */
   @Override
   public void postExecute() {
-
+    postExecute = true;
     if (controller != null) {
       controllerPost();
     }
@@ -933,7 +949,8 @@ public final class PersistRequestBean<T> extends PersistRequest implements BeanP
       postInsert();
     }
 
-    addEvent();
+    addPostCommitListeners();
+    notifyCacheOnPostExecute();
 
     if (isLogSummary()) {
       logSummary();
@@ -1011,14 +1028,12 @@ public final class PersistRequestBean<T> extends PersistRequest implements BeanP
   }
 
   /**
-   * Add the bean to the TransactionEvent. This will be used by TransactionManager to sync Cache,
-   * Cluster and text indexes.
+   * Add the request to TransactionEvent if there are post commit listeners.
    */
-  private void addEvent() {
-
+  private void addPostCommitListeners() {
     TransactionEvent event = transaction.getEvent();
-    if (event != null) {
-      event.add(this);
+    if (event != null && isNotifyListeners()) {
+      event.addListenerNotify(this);
     }
   }
 
@@ -1081,23 +1096,62 @@ public final class PersistRequestBean<T> extends PersistRequest implements BeanP
   }
 
   /**
-   * Check if any of its many properties where cascade saved and hence we need to update related
-   * many property caches.
+   * Completed insert or delete request. Do cache notify in non-batched case.
    */
-  public void checkUpdatedManysOnly() {
+  public void complete() {
+    notifyCacheOnComplete();
+  }
+
+  /**
+   * Completed update request handling cases for element collection and where ONLY
+   * many properties were updated.
+   */
+  public void completeUpdate() {
     if (!dirty && updatedManys != null) {
       // set the flag and register for post commit processing if there
       // is caching or registered listeners
       if (idValue == null) {
         this.idValue = beanDescriptor.getId(entityBean);
       }
+      // not dirty so postExecute() will never be called
+      // set true to trigger cache notify if needed
+      postExecute = true;
       updatedManysOnly = true;
       setNotifyCache();
-      addEvent();
+      addPostCommitListeners();
     }
+    notifyCacheOnComplete();
     postUpdateNotify();
   }
 
+  /**
+   * Notify cache when using batched persist.
+   */
+  private void notifyCacheOnPostExecute() {
+    postExecute = true;
+    if (notifyCache && complete) {
+      // add cache notification (on batch persist)
+      TransactionEvent event = transaction.getEvent();
+      if (event != null) {
+        notifyCache(event.obtainCacheChangeSet());
+      }
+    }
+  }
+
+  /**
+   * Notify cache when not use batched persist.
+   */
+  private void notifyCacheOnComplete() {
+    complete = true;
+    if (notifyCache && postExecute) {
+      // add cache notification (on non-batch persist)
+      TransactionEvent event = transaction.getEvent();
+      if (event != null) {
+        notifyCache(event.obtainCacheChangeSet());
+      }
+    }
+  }
+
   /**
    * For requests that update document store add this event to either the list
    * of queue events or list of update events.
@@ -1377,4 +1431,25 @@ public final class PersistRequestBean<T> extends PersistRequest implements BeanP
       changeSet.addBeanUpdate(beanDescriptor, idValue, changes, updateNaturalKey, getVersion());
     }
   }
+
+  /**
+   * Set an orphan bean that needs to be deleted AFTER the request has persisted.
+   */
+  public void setImportedOrphanForRemoval(BeanPropertyAssocOne<?> prop) {
+    Object orphan = getOrigValue(prop);
+    if (orphan instanceof EntityBean) {
+      orphanBean = (EntityBean) orphan;
+    }
+  }
+
+  public EntityBean getImportedOrphanForRemoval() {
+    return orphanBean;
+  }
+
+  /**
+   * Return the SQL used to fetch the last inserted id value.
+   */
+  public String getSelectLastInsertedId() {
+    return beanDescriptor.getSelectLastInsertedId(publish);
+  }
 }

src/main/java/io/ebeaninternal/server/core/PersistRequestUpdateSql.java

@@ -28,18 +28,23 @@ public final class PersistRequestUpdateSql extends PersistRequest {
 
   private boolean addBatch;
 
-  /**
-   * Create.
-   */
+  private boolean forceNoBatch;
+
   public PersistRequestUpdateSql(SpiEbeanServer server, SpiSqlUpdate sqlUpdate,
-                                 SpiTransaction t, PersistExecute persistExecute) {
+                                 SpiTransaction t, PersistExecute persistExecute, boolean forceNoBatch) {
 
     super(server, t, persistExecute, sqlUpdate.getLabel());
     this.type = Type.UPDATESQL;
     this.updateSql = sqlUpdate;
+    this.forceNoBatch = forceNoBatch;
     updateSql.reset();
   }
 
+  public PersistRequestUpdateSql(SpiEbeanServer server, SpiSqlUpdate sqlUpdate,
+                                 SpiTransaction t, PersistExecute persistExecute) {
+    this(server, sqlUpdate, t, persistExecute, false);
+  }
+
   @Override
   public void profile(long offset, int flushCount) {
     profileBase(EVT_UPDATESQL, offset, (short)0, flushCount);
@@ -60,7 +65,7 @@ public final class PersistRequestUpdateSql extends PersistRequest {
 
   @Override
   public boolean isBatchThisRequest() {
-    return addBatch || super.isBatchThisRequest();
+    return !forceNoBatch && (addBatch || super.isBatchThisRequest());
   }
 
   @Override

src/main/java/io/ebeaninternal/server/core/Persister.java

@@ -74,10 +74,15 @@ public interface Persister {
   int executeOrmUpdate(Update<?> update, Transaction t);
 
   /**
-   * Execute the UpdateSql.
+   * Execute the SqlUpdate (taking into account transaction batch mode).
    */
   int executeSqlUpdate(SqlUpdate update, Transaction t);
 
+  /**
+   * Execute the SqlUpdate now regardless of transaction batch mode.
+   */
+  int executeSqlUpdateNow(SpiSqlUpdate update, Transaction t);
+
   /**
    * Execute the CallableSql.
    */

src/main/java/io/ebeaninternal/server/core/PlatformDdlBuilder.java

@@ -4,6 +4,7 @@ import io.ebean.config.dbplatform.DatabasePlatform;
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.CockroachDdl;
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.DB2Ddl;
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.H2Ddl;
+import io.ebeaninternal.dbmigration.ddlgeneration.platform.HanaColumnStoreDdl;
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.HsqldbDdl;
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.MySqlDdl;
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.Oracle10Ddl;
@@ -47,6 +48,8 @@ public class PlatformDdlBuilder {
       case SQLSERVER17:
       case SQLSERVER:
         return new SqlServerDdl(platform);
+      case HANA:
+        return new HanaColumnStoreDdl(platform);
       default:
         return new PlatformDdl(platform);
     }

src/main/java/io/ebeaninternal/server/core/SimpleDataSourceProvider.java

@@ -1,7 +1,7 @@
 package io.ebeaninternal.server.core;
 
 import io.ebeaninternal.server.transaction.DataSourceSupplier;
-import org.avaje.datasource.DataSourcePool;
+import io.ebean.datasource.DataSourcePool;
 
 import javax.sql.DataSource;
 import java.sql.Connection;

src/main/java/io/ebeaninternal/server/deploy/AssocOneHelpRefExported.java

@@ -7,8 +7,14 @@ import io.ebeaninternal.server.query.SqlJoinType;
  */
 class AssocOneHelpRefExported extends AssocOneHelp {
 
-  public AssocOneHelpRefExported(BeanPropertyAssocOne<?> property) {
+  private final boolean softDelete;
+
+  private final String softDeletePredicate;
+
+  AssocOneHelpRefExported(BeanPropertyAssocOne<?> property) {
     super(property);
+    this.softDelete = property.targetDescriptor.isSoftDelete();
+    this.softDeletePredicate = (softDelete) ? property.targetDescriptor.getSoftDeletePredicate("") : null;
   }
 
   /**
@@ -28,6 +34,10 @@ class AssocOneHelpRefExported extends AssocOneHelp {
   void appendFrom(DbSqlContext ctx, SqlJoinType joinType) {
 
     String relativePrefix = ctx.getRelativePrefix(property.getName());
-    property.tableJoin.addJoin(joinType, relativePrefix, ctx);
+    if (softDelete && !ctx.isIncludeSoftDelete()) {
+      property.tableJoin.addJoin(joinType, relativePrefix, ctx, softDeletePredicate);
+    } else {
+      property.tableJoin.addJoin(joinType, relativePrefix, ctx);
+    }
   }
 }

src/main/java/io/ebeaninternal/server/deploy/BeanCollectionUtil.java

@@ -22,7 +22,7 @@ public class BeanCollectionUtil {
   }
 
   /**
-   * Return the details of the collection or map taking care to avoid
+   * Return the details (map entry set) of the collection or map taking care to avoid
    * unnecessary fetching of the data.
    */
   public static Collection<?> getActualEntries(Object o) {
@@ -48,4 +48,32 @@ public class BeanCollectionUtil {
     }
     throw new PersistenceException("expecting a Map or Collection but got [" + o.getClass().getName() + "]");
   }
+
+  /**
+   * Return the details (map values) of the collection or map taking care to avoid
+   * unnecessary fetching of the data.
+   */
+  public static Collection<?> getActualDetails(Object o) {
+    if (o == null) {
+      return null;
+    }
+    if (o instanceof BeanCollection<?>) {
+      BeanCollection<?> bc = (BeanCollection<?>) o;
+      if (!bc.isPopulated()) {
+        return null;
+      }
+      // For maps this is a collection of Map.Entry, otherwise it
+      // returns a collection of beans
+      return bc.getActualDetails();
+    }
+
+    if (o instanceof Map<?, ?>) {
+      // yes, we want the entrySet (to set the keys)
+      return ((Map<?, ?>) o).values();
+
+    } else if (o instanceof Collection<?>) {
+      return ((Collection<?>) o);
+    }
+    throw new PersistenceException("expecting a Map or Collection but got [" + o.getClass().getName() + "]");
+  }
 }

src/main/java/io/ebeaninternal/server/deploy/BeanDescriptor.java

@@ -7,7 +7,6 @@ import io.ebean.SqlUpdate;
 import io.ebean.Transaction;
 import io.ebean.ValuePair;
 import io.ebean.annotation.DocStoreMode;
-import io.ebean.annotation.PartitionMode;
 import io.ebean.bean.BeanCollection;
 import io.ebean.bean.EntityBean;
 import io.ebean.bean.EntityBeanIntercept;
@@ -100,6 +99,7 @@ import java.sql.SQLException;
 import java.sql.Types;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.LinkedHashMap;
@@ -107,6 +107,8 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
 
 /**
  * Describes Beans including their deployment information.
@@ -179,6 +181,7 @@ public class BeanDescriptor<T> implements BeanType<T>, STreeType {
    * getGeneratedKeys is not supported.
    */
   private final String selectLastInsertedId;
+  private final String selectLastInsertedIdDraft;
 
   private final boolean autoTunable;
 
@@ -470,6 +473,7 @@ public class BeanDescriptor<T> implements BeanType<T>, STreeType {
     this.sequenceInitialValue = deploy.getSequenceInitialValue();
     this.sequenceAllocationSize = deploy.getSequenceAllocationSize();
     this.selectLastInsertedId = deploy.getSelectLastInsertedId();
+    this.selectLastInsertedIdDraft = deploy.getSelectLastInsertedIdDraft();
     this.concurrencyMode = deploy.getConcurrencyMode();
     this.updateChangesOnly = deploy.isUpdateChangesOnly();
     this.indexDefinitions = deploy.getIndexDefinitions();
@@ -1133,6 +1137,7 @@ public class BeanDescriptor<T> implements BeanType<T>, STreeType {
    * Return true if this object is the root level object in its entity
    * inheritance.
    */
+  @Override
   public boolean isInheritanceRoot() {
     return inheritInfo == null || inheritInfo.isRoot();
   }
@@ -3082,8 +3087,15 @@ public class BeanDescriptor<T> implements BeanType<T>, STreeType {
    * supported.
    * </p>
    */
-  public String getSelectLastInsertedId() {
-    return selectLastInsertedId;
+  public String getSelectLastInsertedId(boolean publish) {
+    return publish ? selectLastInsertedId : selectLastInsertedIdDraft;
+  }
+
+  /**
+   * Return true if this bean uses a SQL select to fetch the last inserted id value.
+   */
+  public boolean supportsSelectLastInsertedId() {
+    return selectLastInsertedId != null;
   }
 
   @Override
@@ -3475,4 +3487,29 @@ public class BeanDescriptor<T> implements BeanType<T>, STreeType {
   public List<BeanProperty[]> getUniqueProps() {
     return propertiesUnique;
   }
+
+  @Override
+  public List<BeanType<?>> getInheritanceChildren() {
+    if (hasInheritance()) {
+      return getInheritInfo().getChildren()
+        .stream()
+        .map(InheritInfo::desc)
+        .collect(Collectors.toList());
+    } else {
+      return Collections.emptyList();
+    }
+  }
+
+  @Override
+  public BeanType<?> getInheritanceParent() {
+    return getInheritInfo() == null ? null : getInheritInfo().getParent().desc();
+  }
+
+  @Override
+  public void visitAllInheritanceChildren(Consumer<BeanType<?>> visitor) {
+    if (hasInheritance()) {
+      getInheritInfo().visitChildren(info -> visitor.accept(info.desc()));
+    }
+  }
+
 }

src/main/java/io/ebeaninternal/server/deploy/BeanDescriptorCacheHelp.java

@@ -348,13 +348,12 @@ final class BeanDescriptorCacheHelp<T> {
 
   private CachedManyIds createManyIds(BeanPropertyAssocMany<?> many, Object details) {
 
-    BeanDescriptor<?> targetDescriptor = many.getTargetDescriptor();
-
-    Collection<?> actualDetails = BeanCollectionUtil.getActualEntries(details);
+    Collection<?> actualDetails = BeanCollectionUtil.getActualDetails(details);
     if (actualDetails == null) {
       return null;
     }
 
+    BeanDescriptor<?> targetDescriptor = many.getTargetDescriptor();
     List<Object> idList = new ArrayList<>(actualDetails.size());
     for (Object bean : actualDetails) {
       idList.add(targetDescriptor.getId((EntityBean) bean));
@@ -794,7 +793,6 @@ final class BeanDescriptorCacheHelp<T> {
         // query caching only
         return;
       }
-
       List<BeanPropertyAssocMany<?>> manyCollections = updateRequest.getUpdatedManyCollections();
       if (manyCollections != null) {
         for (BeanPropertyAssocMany<?> many : manyCollections) {

src/main/java/io/ebeaninternal/server/deploy/BeanDescriptorManager.java

@@ -6,6 +6,7 @@ import io.ebean.RawSqlBuilder;
 import io.ebean.annotation.ConstraintMode;
 import io.ebean.bean.BeanCollection;
 import io.ebean.bean.EntityBean;
+import io.ebean.config.BeanNotEnhancedException;
 import io.ebean.config.EncryptKey;
 import io.ebean.config.EncryptKeyManager;
 import io.ebean.config.NamingConvention;
@@ -388,6 +389,9 @@ public class BeanDescriptorManager implements BeanDescriptorMap {
 
       return asOfTableMap;
 
+    } catch (BeanNotEnhancedException e) {
+      throw e;
+
     } catch (RuntimeException e) {
       logger.error("Error in deployment", e);
       throw e;
@@ -1387,9 +1391,10 @@ public class BeanDescriptorManager implements BeanDescriptorMap {
     }
 
     if (IdType.IDENTITY == desc.getIdType()) {
-      // used when getGeneratedKeys is not supported (SQL Server 2000)
+      // used when getGeneratedKeys is not supported (SQL Server 2000, SAP Hana)
       String selectLastInsertedId = dbIdentity.getSelectLastInsertedId(desc.getBaseTable());
-      desc.setSelectLastInsertedId(selectLastInsertedId);
+      String selectLastInsertedIdDraft = (!desc.isDraftable()) ? selectLastInsertedId : dbIdentity.getSelectLastInsertedId(desc.getDraftTable());
+      desc.setSelectLastInsertedId(selectLastInsertedId, selectLastInsertedIdDraft);
       return;
     }
 
@@ -1470,7 +1475,7 @@ public class BeanDescriptorManager implements BeanDescriptorMap {
         if (isPersistentField(prop)) {
           throw new IllegalStateException(
             "If you are running in an IDE with enhancement plugin try a Build -> Rebuild Project to recompile and enhance all entity beans. " +
-            "Error - property " + propName + " not found in " + reflectProps + " for type " + desc.getBeanType());
+              "Error - property " + propName + " not found in " + reflectProps + " for type " + desc.getBeanType());
         }
 
       } else {
@@ -1553,7 +1558,9 @@ public class BeanDescriptorManager implements BeanDescriptorMap {
     Class<?> beanClass = desc.getBeanType();
 
     if (!hasEntityBeanInterface(beanClass)) {
-      throw new IllegalStateException("Bean " + beanClass + " is not enhanced?");
+      String msg = "Bean " + beanClass + " is not enhanced? If you are running in IDEA or Eclipse check" +
+        " that the enhancement plugin is installed. See https://ebean-orm.github.io/docs/trouble-shooting#not-enhanced";
+      throw new BeanNotEnhancedException(msg);
     }
 
     // the bean already implements EntityBean
@@ -1582,7 +1589,7 @@ public class BeanDescriptorManager implements BeanDescriptorMap {
         // ok to stop and treat just the same as Object.class
         return;
       }
-      throw new IllegalStateException("Super type " + superclass + " is not enhanced?");
+      throw new BeanNotEnhancedException("Super type " + superclass + " is not enhanced? See https://ebean-orm.github.io/docs/trouble-shooting#not-enhanced");
     }
 
     // recursively continue up the inheritance hierarchy
@@ -1665,11 +1672,14 @@ public class BeanDescriptorManager implements BeanDescriptorMap {
 
   private ElementHelp elementHelper(ManyType manyType) {
     switch (manyType) {
-      case LIST: return new ElementHelpList();
-      case SET: return new ElementHelpSet();
-      case MAP: return new ElementHelpMap();
+      case LIST:
+        return new ElementHelpList();
+      case SET:
+        return new ElementHelpSet();
+      case MAP:
+        return new ElementHelpMap();
       default:
-        throw new IllegalStateException("manyType unexpected "+manyType);
+        throw new IllegalStateException("manyType unexpected " + manyType);
     }
   }
 

src/main/java/io/ebeaninternal/server/deploy/BeanEmbeddedMetaFactory.java

@@ -1,5 +1,6 @@
 package io.ebeaninternal.server.deploy;
 
+import io.ebean.config.BeanNotRegisteredException;
 import io.ebeaninternal.server.deploy.meta.DeployBeanPropertyAssocOne;
 
 import javax.persistence.PersistenceException;
@@ -22,8 +23,8 @@ public class BeanEmbeddedMetaFactory {
     BeanDescriptor<?> targetDesc = owner.getBeanDescriptor(prop.getTargetType());
     if (targetDesc == null) {
       String msg = "Could not find BeanDescriptor for " + prop.getTargetType()
-        + ". Perhaps the EmbeddedId class is not registered?";
-      throw new PersistenceException(msg);
+        + ". Perhaps the EmbeddedId class is not registered? See https://ebean-orm.github.io/docs/trouble-shooting#not-registered";
+      throw new BeanNotRegisteredException(msg);
     }
 
     // deployment override information (column names)

src/main/java/io/ebeaninternal/server/deploy/BeanProperty.java

@@ -979,6 +979,7 @@ public class BeanProperty implements ElPropertyValue, Property, STreeProperty {
   /**
    * Return the full name of this property.
    */
+  @Override
   public String getFullBeanName() {
     return descriptor.getFullName() + "." + name;
   }
@@ -994,6 +995,7 @@ public class BeanProperty implements ElPropertyValue, Property, STreeProperty {
   /**
    * Return the scalarType.
    */
+  @Override
   @SuppressWarnings(value = "unchecked")
   public ScalarType<Object> getScalarType() {
     return scalarType;
@@ -1283,7 +1285,7 @@ public class BeanProperty implements ElPropertyValue, Property, STreeProperty {
    * Return true if this is a ManyToMany with history support (on the intersection table).
    */
   public boolean isManyToManyWithHistory() {
-    return !excludedFromHistory && descriptor.isHistorySupport();
+    return false;
   }
 
   /**
@@ -1369,6 +1371,7 @@ public class BeanProperty implements ElPropertyValue, Property, STreeProperty {
   /**
    * Return the property type.
    */
+  @Override
   public Class<?> getPropertyType() {
     return propertyType;
   }

src/main/java/io/ebeaninternal/server/deploy/BeanPropertyAssocMany.java

@@ -208,6 +208,11 @@ public class BeanPropertyAssocMany<T> extends BeanPropertyAssoc<T> implements ST
     }
   }
 
+  @Override
+  public boolean isManyToManyWithHistory() {
+    return manyToMany && !excludedFromHistory && descriptor.isHistorySupport();
+  }
+
   @Override
   protected void docStoreIncludeByDefault(PathProperties pathProps) {
     // by default not including "Many" properties in document store
@@ -318,11 +323,11 @@ public class BeanPropertyAssocMany<T> extends BeanPropertyAssoc<T> implements ST
   /**
    * Find the Id's of detail beans given a parent Id or list of parent Id's.
    */
-  public List<Object> findIdsByParentId(Object parentId, List<Object> parentIdList, Transaction t, List<Object> excludeDetailIds) {
+  public List<Object> findIdsByParentId(Object parentId, List<Object> parentIdList, Transaction t, List<Object> excludeDetailIds, boolean hard) {
     if (parentId != null) {
-      return sqlHelp.findIdsByParentId(parentId, t, excludeDetailIds);
+      return sqlHelp.findIdsByParentId(parentId, t, excludeDetailIds, hard);
     } else {
-      return sqlHelp.findIdsByParentIdList(parentIdList, t, excludeDetailIds);
+      return sqlHelp.findIdsByParentIdList(parentIdList, t, excludeDetailIds, hard);
     }
   }
 

src/main/java/io/ebeaninternal/server/deploy/BeanPropertyAssocManySqlHelp.java

@@ -127,14 +127,16 @@ class BeanPropertyAssocManySqlHelp<T> {
     many.bindParentIdsIn(expr, parentIds, query);
   }
 
-  List<Object> findIdsByParentId(Object parentId, Transaction t, List<Object> excludeDetailIds) {
+  List<Object> findIdsByParentId(Object parentId, Transaction t, List<Object> excludeDetailIds, boolean hard) {
 
     String rawWhere = deriveWhereParentIdSql(false, "");
 
     SpiEbeanServer server = descriptor.getEbeanServer();
     SpiQuery<?> q = many.newQuery(server);
     many.bindParentIdEq(rawWhere, parentId, q);
-
+    if (hard) {
+      q.setIncludeSoftDeletes();
+    }
     if (excludeDetailIds != null && !excludeDetailIds.isEmpty()) {
       q.where().not(q.getExpressionFactory().idIn(excludeDetailIds));
     }
@@ -142,7 +144,7 @@ class BeanPropertyAssocManySqlHelp<T> {
     return server.findIds(q, t);
   }
 
-  List<Object> findIdsByParentIdList(List<Object> parentIds, Transaction t, List<Object> excludeDetailIds) {
+  List<Object> findIdsByParentIdList(List<Object> parentIds, Transaction t, List<Object> excludeDetailIds, boolean hard) {
 
     String rawWhere = deriveWhereParentIdSql(true, "");
     String inClause = buildInClauseBinding(parentIds.size(), exportedPropertyBindProto);
@@ -153,7 +155,9 @@ class BeanPropertyAssocManySqlHelp<T> {
     SpiQuery<?> q = many.newQuery(server);
     //Query<?> q = server.find(propertyType);
     many.bindParentIdsIn(expr, parentIds, q);
-
+    if (hard) {
+      q.setIncludeSoftDeletes();
+    }
     if (excludeDetailIds != null && !excludeDetailIds.isEmpty()) {
       q.where().not(q.getExpressionFactory().idIn(excludeDetailIds));
     }

src/main/java/io/ebeaninternal/server/deploy/BeanPropertyAssocOne.java

@@ -261,7 +261,7 @@ public class BeanPropertyAssocOne<T> extends BeanPropertyAssoc<T> implements STr
   private List<Object> findIdsByParentIdList(List<Object> parentIds, Transaction t) {
 
     String rawWhere = deriveWhereParentIdSql(true);
-    String inClause = targetIdBinder.getIdInValueExpr(false, parentIds.size());
+    String inClause = getIdBinder().getIdInValueExpr(false, parentIds.size());
     String expr = rawWhere + inClause;
 
     SpiEbeanServer server = server();
@@ -537,8 +537,7 @@ public class BeanPropertyAssocOne<T> extends BeanPropertyAssoc<T> implements STr
       BeanProperty[] emIds = targetDesc.propertiesBaseScalar();
       try {
         for (BeanProperty emId : emIds) {
-          ExportedProperty expProp = findMatch(true, emId);
-          list.add(expProp);
+          list.add(findMatch(true, emId));
         }
       } catch (PersistenceException e) {
         // not found as individual scalar properties
@@ -547,8 +546,7 @@ public class BeanPropertyAssocOne<T> extends BeanPropertyAssoc<T> implements STr
 
     } else {
       if (idProp != null) {
-        ExportedProperty expProp = findMatch(false, idProp);
-        list.add(expProp);
+        list.add(findMatch(false, idProp));
       }
     }
 

src/main/java/io/ebeaninternal/server/deploy/DbSqlContext.java

@@ -12,8 +12,6 @@ public interface DbSqlContext {
    */
   void addJoin(String type, String table, TableJoinColumn[] cols, String a1, String a2, String inheritance);
 
-  void pushSecondaryTableAlias(String alias);
-
   /**
    * Push the current table alias onto the stack.
    */
@@ -91,11 +89,6 @@ public interface DbSqlContext {
    */
   String getContent();
 
-  /**
-   * Return the current join node.
-   */
-  String peekJoin();
-
   /**
    * Push a join node onto the stack.
    */
@@ -125,6 +118,11 @@ public interface DbSqlContext {
    */
   void appendHistorySysPeriod();
 
+  /**
+   * Return true if the query includes soft deleted rows.
+   */
+  boolean isIncludeSoftDelete();
+
   /**
    * Return true if the query is a 'asDraft' query.
    */
@@ -139,4 +137,5 @@ public interface DbSqlContext {
    * Append 'for update' lock hints on FROM clause (sql server only).
    */
   void appendFromForUpdate();
+
 }

src/main/java/io/ebeaninternal/server/deploy/DeployParser.java

@@ -22,6 +22,11 @@ public abstract class DeployParser {
    */
   protected static final char UNDERSCORE = '_';
 
+  protected static final char OPEN_SQUARE_BRACKET = '[';
+  protected static final char CLOSE_SQUARE_BRACKET = ']';
+  protected static final char DOUBLE_QUOTE = '\"';
+  protected static final char BACK_QUOTE = '`';
+
   /**
    * Used to determine when a column name terminates.
    */
@@ -183,10 +188,10 @@ public abstract class DeployParser {
       wordBuffer.append(ch);
       return false;
     }
-    return Character.isLetterOrDigit(ch) || ch == UNDERSCORE || ch == PERIOD;
+    return Character.isLetterOrDigit(ch) || ch == UNDERSCORE || ch == PERIOD || ch == DOUBLE_QUOTE || ch == CLOSE_SQUARE_BRACKET || ch == BACK_QUOTE;
   }
 
   private boolean isWordStart(char ch) {
-    return Character.isLetter(ch) || ch == UNDERSCORE;
+    return Character.isLetter(ch) || ch == UNDERSCORE || ch == DOUBLE_QUOTE || ch == OPEN_SQUARE_BRACKET || ch == BACK_QUOTE;
   }
 }

src/main/java/io/ebeaninternal/server/deploy/TableJoin.java

@@ -126,6 +126,16 @@ public final class TableJoin {
     return type;
   }
 
+  public SqlJoinType addJoin(SqlJoinType joinType, String prefix, DbSqlContext ctx, String predicate) {
+    String[] names = SplitName.split(prefix);
+    String a1 = ctx.getTableAlias(names[0]);
+    String a2 = ctx.getTableAlias(prefix);
+
+    SqlJoinType returnJoinType = addJoin(joinType, a1, a2, ctx);
+    ctx.append("and ").append(a2).append(predicate);
+    return returnJoinType;
+  }
+
   public SqlJoinType addJoin(SqlJoinType joinType, String prefix, DbSqlContext ctx) {
 
     String[] names = SplitName.split(prefix);

src/main/java/io/ebeaninternal/server/deploy/meta/DeployBeanDescriptor.java

@@ -3,7 +3,6 @@ package io.ebeaninternal.server.deploy.meta;
 import io.ebean.annotation.Cache;
 import io.ebean.annotation.DocStore;
 import io.ebean.annotation.DocStoreMode;
-import io.ebean.annotation.PartitionMode;
 import io.ebean.config.ServerConfig;
 import io.ebean.config.TableName;
 import io.ebean.config.dbplatform.IdType;
@@ -126,6 +125,7 @@ public class DeployBeanDescriptor<T> {
    * Used with Identity columns but no getGeneratedKeys support.
    */
   private String selectLastInsertedId;
+  private String selectLastInsertedIdDraft;
 
   /**
    * The concurrency mode for beans of this type.
@@ -222,6 +222,8 @@ public class DeployBeanDescriptor<T> {
 
   private short profileId;
 
+  private Object jacksonAnnotatedClass;
+
   /**
    * Construct the BeanDescriptor.
    */
@@ -839,11 +841,16 @@ public class DeployBeanDescriptor<T> {
     return selectLastInsertedId;
   }
 
+  public String getSelectLastInsertedIdDraft() {
+    return selectLastInsertedIdDraft;
+  }
+
   /**
    * Set the SQL used to return the last inserted Id.
    */
-  public void setSelectLastInsertedId(String selectLastInsertedId) {
+  public void setSelectLastInsertedId(String selectLastInsertedId, String selectLastInsertedIdDraft) {
     this.selectLastInsertedId = selectLastInsertedId;
+    this.selectLastInsertedIdDraft = selectLastInsertedIdDraft;
   }
 
   /**
@@ -1232,6 +1239,7 @@ public class DeployBeanDescriptor<T> {
       this.descriptor = descriptor;
     }
 
+    @Override
     public String getDeployWord(String expression) {
       return descriptor.getDeployWord(expression);
     }
@@ -1246,4 +1254,13 @@ public class DeployBeanDescriptor<T> {
     return (property == null) ? null : "${ta}." + property.getDbColumn();
   }
 
+  /**
+   * Returns the jackson annotated class, if jackson is present.
+   */
+  public Object /*AnnotatedClass*/ getJacksonAnnotatedClass() {
+    if (jacksonAnnotatedClass == null) {
+      jacksonAnnotatedClass = new DeployBeanObtainJackson(serverConfig, beanType).obtain();
+    }
+    return jacksonAnnotatedClass;
+  }
 }

src/main/java/io/ebeaninternal/server/deploy/meta/DeployBeanObtainJackson.java

@@ -0,0 +1,30 @@
+package io.ebeaninternal.server.deploy.meta;
+
+import com.fasterxml.jackson.databind.JavaType;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.introspect.AnnotatedClassResolver;
+import io.ebean.config.ServerConfig;
+
+/**
+ * Used to obtain the Jackson AnnotatedClass for a given bean type utlimately to obtain field level Jackson annotations.
+ */
+class DeployBeanObtainJackson<T> {
+
+  private final ServerConfig serverConfig;
+  private final Class<T> beanType;
+
+  DeployBeanObtainJackson(ServerConfig serverConfig, Class<T> beanType) {
+    this.serverConfig = serverConfig;
+    this.beanType = beanType;
+  }
+
+  /**
+   * Return the Jackson AnnotatedClass for the given bean type.
+   */
+  Object obtain() {
+
+    ObjectMapper objectMapper = (ObjectMapper) serverConfig.getObjectMapper();
+    JavaType javaType = objectMapper.getTypeFactory().constructType(beanType);
+    return AnnotatedClassResolver.resolve(objectMapper.getDeserializationConfig(), javaType, objectMapper.getDeserializationConfig());
+  }
+}

src/main/java/io/ebeaninternal/server/deploy/meta/DeployBeanProperty.java

@@ -1124,4 +1124,18 @@ public class DeployBeanProperty {
   public void setElementProperty() {
     this.elementProperty = true;
   }
+
+  /**
+   * Returns the jackson annotated field, if jackson is present.
+   */
+  public Object /*AnnotatedField*/ getJacksonField() {
+    com.fasterxml.jackson.databind.introspect.AnnotatedClass jac =
+        (com.fasterxml.jackson.databind.introspect.AnnotatedClass) getDesc().getJacksonAnnotatedClass();
+    for (com.fasterxml.jackson.databind.introspect.AnnotatedField candidate : jac.fields()) {
+      if (candidate.getName().equals(getName())) {
+        return candidate;
+      }
+    }
+    return null;
+  }
 }

src/main/java/io/ebeaninternal/server/deploy/parse/AnnotationAssocManys.java

@@ -6,6 +6,7 @@ import io.ebean.annotation.HistoryExclude;
 import io.ebean.annotation.PrivateOwned;
 import io.ebean.annotation.Where;
 import io.ebean.bean.BeanCollection.ModifyListenMode;
+import io.ebean.config.BeanNotRegisteredException;
 import io.ebean.config.NamingConvention;
 import io.ebean.config.TableName;
 import io.ebean.util.CamelCaseHelper;
@@ -430,7 +431,7 @@ class AnnotationAssocManys extends AnnotationParser {
 
 
   private String errorMsgMissingBeanTable(Class<?> type, String from) {
-    return "Error with association to [" + type + "] from [" + from + "]. Is " + type + " registered?";
+    return "Error with association to [" + type + "] from [" + from + "]. Is " + type + " registered? See https://ebean-orm.github.io/docs/trouble-shooting#not-registered";
   }
 
   private void readToMany(ManyToMany propAnn, DeployBeanPropertyAssocMany<?> manyProp) {
@@ -451,8 +452,7 @@ class AnnotationAssocManys extends AnnotationParser {
     // find the other many table (not intersection)
     BeanTable assoc = factory.getBeanTable(targetType);
     if (assoc == null) {
-      String msg = errorMsgMissingBeanTable(targetType, manyProp.getFullBeanName());
-      throw new RuntimeException(msg);
+      throw new BeanNotRegisteredException(errorMsgMissingBeanTable(targetType, manyProp.getFullBeanName()));
     }
 
     manyProp.setManyToMany();
@@ -478,8 +478,7 @@ class AnnotationAssocManys extends AnnotationParser {
 
     BeanTable assoc = factory.getBeanTable(targetType);
     if (assoc == null) {
-      String msg = errorMsgMissingBeanTable(targetType, manyProp.getFullBeanName());
-      throw new RuntimeException(msg);
+      throw new BeanNotRegisteredException(errorMsgMissingBeanTable(targetType, manyProp.getFullBeanName()));
     }
 
     manyProp.setBeanTable(assoc);

src/main/java/io/ebeaninternal/server/deploy/parse/AnnotationAssocOnes.java

@@ -4,6 +4,7 @@ import io.ebean.annotation.DbForeignKey;
 import io.ebean.annotation.FetchPreference;
 import io.ebean.annotation.TenantId;
 import io.ebean.annotation.Where;
+import io.ebean.config.BeanNotRegisteredException;
 import io.ebean.config.NamingConvention;
 import io.ebeaninternal.server.deploy.BeanDescriptorManager;
 import io.ebeaninternal.server.deploy.BeanTable;
@@ -132,6 +133,9 @@ public class AnnotationAssocOnes extends AnnotationParser {
     // check for manually defined joins
     BeanTable beanTable = prop.getBeanTable();
     for (JoinColumn joinColumn : getAll(prop, JoinColumn.class)) {
+      if (beanTable == null) {
+        throw new IllegalStateException("Looks like a missing @ManyToOne or @OneToOne on property " + prop.getFullBeanName()+" - no related 'BeanTable'");
+      }
       prop.getTableJoin().addJoinColumn(false, joinColumn, beanTable);
       if (!joinColumn.updatable()) {
         prop.setDbUpdateable(false);
@@ -146,6 +150,9 @@ public class AnnotationAssocOnes extends AnnotationParser {
     JoinTable joinTable = get(prop, JoinTable.class);
     if (joinTable != null) {
       for (JoinColumn joinColumn : joinTable.joinColumns()) {
+        if (beanTable == null) {
+          throw new IllegalStateException("Looks like a missing @ManyToOne or @OneToOne on property " + prop.getFullBeanName()+" - no related 'BeanTable'");
+        }
         prop.getTableJoin().addJoinColumn(false, joinColumn, beanTable);
         if (!joinColumn.updatable()) {
           prop.setDbUpdateable(false);
@@ -188,13 +195,13 @@ public class AnnotationAssocOnes extends AnnotationParser {
   }
 
   private String errorMsgMissingBeanTable(Class<?> type, String from) {
-    return "Error with association to [" + type + "] from [" + from + "]. Is " + type + " registered? Does it have the @Entity annotation?";
+    return "Error with association to [" + type + "] from [" + from + "]. Is " + type + " registered? Does it have the @Entity annotation? See https://ebean-orm.github.io/docs/trouble-shooting#not-registered";
   }
 
   private BeanTable beanTable(DeployBeanPropertyAssoc<?> prop) {
     BeanTable assoc = factory.getBeanTable(prop.getPropertyType());
     if (assoc == null) {
-      throw new RuntimeException(errorMsgMissingBeanTable(prop.getPropertyType(), prop.getFullBeanName()));
+      throw new BeanNotRegisteredException(errorMsgMissingBeanTable(prop.getPropertyType(), prop.getFullBeanName()));
     }
     return assoc;
   }
@@ -223,6 +230,8 @@ public class AnnotationAssocOnes extends AnnotationParser {
     if (!"".equals(propAnn.mappedBy())) {
       prop.setOneToOneExported();
       prop.setOrphanRemoval(propAnn.orphanRemoval());
+    } else if (propAnn.orphanRemoval()) {
+      prop.setOrphanRemoval(true);
     }
 
     setCascadeTypes(propAnn.cascade(), prop.getCascadeInfo());

src/main/java/io/ebeaninternal/server/deploy/parse/AnnotationBase.java

@@ -82,12 +82,12 @@ public abstract class AnnotationBase {
     T a = null;
     Field field = prop.getField();
     if (field != null) {
-      a = AnnotationUtil.findAnnotation(field, annClass);
+      a = AnnotationUtil.findAnnotation(field, annClass, platform);
     }
     if (a == null) {
       Method method = prop.getReadMethod();
       if (method != null) {
-        a = AnnotationUtil.findAnnotation(method, annClass);
+        a = AnnotationUtil.findAnnotation(method, annClass, platform);
       }
     }
     return a;

src/main/java/io/ebeaninternal/server/deploy/parse/DeployUtil.java

@@ -239,10 +239,9 @@ public class DeployUtil {
 
   private void setDbJsonType(DeployBeanProperty prop, int dbType, int dbLength) {
 
-    Class<?> type = prop.getPropertyType();
-    ScalarType<?> scalarType = typeManager.getJsonScalarType(type, dbType, dbLength, prop.getGenericType());
+    ScalarType<?> scalarType = typeManager.getJsonScalarType(prop, dbType, dbLength);
     if (scalarType == null) {
-      throw new RuntimeException("No ScalarType for JSON type [" + type + "] [" + dbType + "]");
+      throw new RuntimeException("No ScalarType for JSON property [" + prop + "] [" + dbType + "]");
     }
     prop.setDbType(dbType);
     prop.setScalarType(scalarType);

src/main/java/io/ebeaninternal/server/expression/DefaultExpressionList.java

@@ -17,6 +17,7 @@ import io.ebean.PagedList;
 import io.ebean.Pairs;
 import io.ebean.Query;
 import io.ebean.QueryIterator;
+import io.ebean.Transaction;
 import io.ebean.Version;
 import io.ebean.event.BeanQueryRequest;
 import io.ebean.search.Match;
@@ -356,11 +357,21 @@ public class DefaultExpressionList<T> implements SpiExpressionList<T> {
     return query.delete();
   }
 
+  @Override
+  public int delete(Transaction transaction) {
+    return query.delete(transaction);
+  }
+
   @Override
   public int update() {
     return query.update();
   }
 
+  @Override
+  public int update(Transaction transaction) {
+    return query.update(transaction);
+  }
+
   @Override
   public FutureIds<T> findFutureIds() {
     return query.findFutureIds();

src/main/java/io/ebeaninternal/server/expression/InPairsExpression.java

@@ -92,14 +92,7 @@ class InPairsExpression extends AbstractExpression {
       return;
     }
 
-    String concat = request.getDbPlatformHandler().getConcatOperator();
-
-    String concatFormula = "(" + property0 + concat + "'" + separator + "'" + concat + property1;
-    if (suffix != null && !suffix.isEmpty()) {
-      concatFormula += concat + "'" + suffix + "'";
-    }
-    concatFormula += ")";
-    request.append(concatFormula);
+    request.append(request.getDbPlatformHandler().concat(property0, separator, property1, suffix));
     request.appendInExpression(not, concatBindValues);
   }
 

src/main/java/io/ebeaninternal/server/expression/JunctionExpression.java

@@ -16,6 +16,7 @@ import io.ebean.PagedList;
 import io.ebean.Pairs;
 import io.ebean.Query;
 import io.ebean.QueryIterator;
+import io.ebean.Transaction;
 import io.ebean.Version;
 import io.ebean.event.BeanQueryRequest;
 import io.ebean.search.Match;
@@ -318,11 +319,21 @@ class JunctionExpression<T> implements SpiJunction<T>, SpiExpression, Expression
     return exprList.delete();
   }
 
+  @Override
+  public int delete(Transaction transaction) {
+    return exprList.delete(transaction);
+  }
+
   @Override
   public int update() {
     return exprList.update();
   }
 
+  @Override
+  public int update(Transaction transaction) {
+    return exprList.update(transaction);
+  }
+
   @Override
   public Query<T> asOf(Timestamp asOf) {
     return exprList.asOf(asOf);
@@ -667,7 +678,7 @@ class JunctionExpression<T> implements SpiJunction<T>, SpiExpression, Expression
 
   @Override
   public ExpressionList<T> notExists(Query<?> subQuery) {
-    return exprList.exists(subQuery);
+    return exprList.notExists(subQuery);
   }
 
   @Override

src/main/java/io/ebeaninternal/server/expression/platform/BaseDbExpression.java

@@ -8,17 +8,6 @@ import io.ebeaninternal.server.expression.BitwiseOp;
  */
 abstract class BaseDbExpression implements DbExpressionHandler {
 
-  private final String concatOperator;
-
-  BaseDbExpression(String concatOperator) {
-    this.concatOperator = concatOperator;
-  }
-
-  @Override
-  public String getConcatOperator() {
-    return concatOperator;
-  }
-
   @Override
   public void bitwise(SpiExpressionRequest request, String propName, BitwiseOp operator, long flags, String compare, long match) {
 
@@ -57,4 +46,14 @@ abstract class BaseDbExpression implements DbExpressionHandler {
     }
   }
 
+  @Override
+  public String concat(String property0, String separator, String property1, String suffix) {
+    StringBuilder sb = new StringBuilder();
+    sb.append("concat(").append(property0).append(",'").append(separator).append("',").append(property1);
+    if (suffix != null && !suffix.isEmpty()) {
+      sb.append(",'").append(suffix).append('\'');
+    }
+    sb.append(')');
+    return sb.toString();
+  }
 }

src/main/java/io/ebeaninternal/server/expression/platform/BasicDbExpression.java

@@ -8,10 +8,6 @@ import io.ebeaninternal.server.expression.Op;
  */
 public class BasicDbExpression extends BaseDbExpression {
 
-  BasicDbExpression(String concatOperator) {
-    super(concatOperator);
-  }
-
   @Override
   public void json(SpiExpressionRequest request, String propName, String path, Op operator, Object value) {
     throw new RuntimeException("JSON expressions only supported on Postgres and Oracle");

src/main/java/io/ebeaninternal/server/expression/platform/DbExpressionHandler.java

@@ -9,11 +9,6 @@ import io.ebeaninternal.server.expression.Op;
  */
 public interface DbExpressionHandler {
 
-  /**
-   * Return the DB concat operator (Usually SQL standard "||").
-   */
-  String getConcatOperator();
-
   /**
    * Write the db platform specific json expression.
    */
@@ -33,4 +28,9 @@ public interface DbExpressionHandler {
    * Add the bitwise expression.
    */
   void bitwise(SpiExpressionRequest request, String propName, BitwiseOp operator, long flags, String compare, long match);
+
+  /**
+   * Performs a "CONCAT" operation for that platform.
+   */
+  String concat(String property0, String separator, String property1, String suffix);
 }

src/main/java/io/ebeaninternal/server/expression/platform/DbExpressionHandlerFactory.java

@@ -12,20 +12,23 @@ public class DbExpressionHandlerFactory {
   public static DbExpressionHandler from(DatabasePlatform databasePlatform) {
 
     Platform platform = databasePlatform.getPlatform();
-    String concatOperator = databasePlatform.getConcatOperator();
     switch (platform) {
       case H2:
-        return new H2DbExpression(concatOperator);
+        return new H2DbExpression();
       case POSTGRES:
-        return new PostgresDbExpression(concatOperator);
+        return new PostgresDbExpression();
       case MYSQL:
-        return new MySqlDbExpression(concatOperator);
+        return new MySqlDbExpression();
       case ORACLE:
-        return new OracleDbExpression(concatOperator);
+        return new OracleDbExpression();
+      case SQLSERVER16:
+      case SQLSERVER17:
       case SQLSERVER:
-        return new SqlServerDbExpression(concatOperator);
+        return new SqlServerDbExpression();
+      case HANA:
+        return new HanaDbExpression();
       default:
-        return new BasicDbExpression(concatOperator);
+        return new BasicDbExpression();
     }
   }
 }

src/main/java/io/ebeaninternal/server/expression/platform/H2DbExpression.java

@@ -8,10 +8,6 @@ import io.ebeaninternal.server.expression.BitwiseOp;
  */
 class H2DbExpression extends BasicDbExpression {
 
-  H2DbExpression(String concatOperator) {
-    super(concatOperator);
-  }
-
   @Override
   public void bitwise(SpiExpressionRequest request, String propName, BitwiseOp operator, long flags, String compare, long match) {
 

src/main/java/io/ebeaninternal/server/expression/platform/HanaDbExpression.java

@@ -0,0 +1,59 @@
+package io.ebeaninternal.server.expression.platform;
+
+import io.ebeaninternal.api.SpiExpressionRequest;
+import io.ebeaninternal.server.expression.BitwiseOp;
+import io.ebeaninternal.server.expression.Op;
+
+/**
+ * HANA handling of platform specific expressions.
+ */
+public class HanaDbExpression extends BaseDbExpression {
+
+  @Override
+  public void bitwise(SpiExpressionRequest request, String propName, BitwiseOp operator, long flags, String compare, long match) {
+    bitwiseFunction(request, propName, operator, compare);
+  }
+
+  @Override
+  public void json(SpiExpressionRequest request, String propName, String path, Op operator, Object value) {
+    request.append("json_value(").append(propName).append(", '$.").append(path).append("')");
+    request.append(operator.bind());
+  }
+
+  @Override
+  public void arrayIsEmpty(SpiExpressionRequest request, String propName, boolean empty) {
+    request.append("cardinality(").append(propName).append(")");
+    if (empty) {
+      request.append(" = 0");
+    } else {
+      request.append(" <> 0");
+    }
+  }
+
+  @Override
+  public String concat(String property0, String separator, String property1, String suffix) {
+    StringBuilder sb = new StringBuilder();
+    sb.append("concat(").append(property0).append(", '").append(separator).append("'||").append(property1);
+    if (suffix != null && !suffix.isEmpty()) {
+      sb.append("||'").append(suffix).append('\'');
+    }
+    sb.append(")");
+    return sb.toString();
+  }
+
+  @Override
+  public void arrayContains(SpiExpressionRequest request, String propName, boolean contains, Object... values) {
+    for (int i = 0; i < values.length; i++) {
+      if (i > 0) {
+        request.append(" and ");
+      }
+      request.append("(?");
+      if (!contains) {
+        request.append(" not ");
+      }
+      request.append(" member of ").append(propName).append(")");
+
+    }
+  }
+
+}

src/main/java/io/ebeaninternal/server/expression/platform/MySqlDbExpression.java

@@ -5,8 +5,4 @@ package io.ebeaninternal.server.expression.platform;
  */
 class MySqlDbExpression extends BasicDbExpression {
 
-  MySqlDbExpression(String concatOperator) {
-    super(concatOperator);
-  }
-
 }

src/main/java/io/ebeaninternal/server/expression/platform/OracleDbExpression.java

@@ -9,10 +9,6 @@ import io.ebeaninternal.server.expression.Op;
  */
 public class OracleDbExpression extends BaseDbExpression {
 
-  OracleDbExpression(String concatOperator) {
-    super(concatOperator);
-  }
-
   @Override
   public void json(SpiExpressionRequest request, String propName, String path, Op operator, Object value) {
 

src/main/java/io/ebeaninternal/server/expression/platform/PostgresDbExpression.java

@@ -8,10 +8,6 @@ import io.ebeaninternal.server.expression.Op;
  */
 public class PostgresDbExpression extends BaseDbExpression {
 
-  PostgresDbExpression(String concatOperator) {
-    super(concatOperator);
-  }
-
   @Override
   public void json(SpiExpressionRequest request, String propName, String path, Op operator, Object value) {
 
@@ -65,4 +61,16 @@ public class PostgresDbExpression extends BaseDbExpression {
       request.append(" <> 0");
     }
   }
+
+  @Override
+  public String concat(String property0, String separator, String property1, String suffix) {
+    StringBuilder sb = new StringBuilder();
+    sb.append("(").append(property0).append("||'").append(separator).append("'||").append(property1);
+
+    if (suffix != null && !suffix.isEmpty()) {
+      sb.append("||'").append(suffix).append('\'');
+    }
+    sb.append(')');
+    return sb.toString();
+  }
 }

src/main/java/io/ebeaninternal/server/expression/platform/SqlServerDbExpression.java

@@ -8,10 +8,6 @@ import io.ebeaninternal.server.expression.Op;
  */
 public class SqlServerDbExpression extends BaseDbExpression {
 
-  SqlServerDbExpression(String concatOperator) {
-    super(concatOperator);
-  }
-
   @Override
   public void json(final SpiExpressionRequest request, final String propName,
                    final String path, final Op operator, final Object value) {

src/main/java/io/ebeaninternal/server/idgen/UuidV1IdGenerator.java

@@ -82,8 +82,17 @@ public class UuidV1IdGenerator extends UuidV1RndIdGenerator {
     final Enumeration<NetworkInterface> e = NetworkInterface.getNetworkInterfaces();
     while (e.hasMoreElements()) {
       NetworkInterface network = e.nextElement();
-      if (!network.isLoopback()) {
-        return network.getHardwareAddress();
+      try {
+        logger.trace("Probing interface {}", network);
+        if (!network.isLoopback()) {
+          byte[] addr = network.getHardwareAddress();
+          if (addr != null) {
+            logger.debug("Using interface {}", network);
+            return addr;
+          }
+        }
+      } catch (SocketException ex) {
+        logger.debug("Skipping {}", network, ex);
       }
     }
     return null;
@@ -181,6 +190,10 @@ public class UuidV1IdGenerator extends UuidV1RndIdGenerator {
     prop.setProperty("nodeId", getNodeIdentifier());
     prop.setProperty("clockSeq", String.valueOf(clockSeq.get()));
     prop.setProperty("timeStamp", String.valueOf(timeStamp.get()));
+    File dir = stateFile.getParentFile();
+    if (dir != null) {
+      dir.mkdirs();
+    }
     try (OutputStream os = new FileOutputStream(stateFile)) {
       prop.store(os, "ebean uuid state file");
       logger.debug("Persisted state to '{}'", stateFile);

src/main/java/io/ebeaninternal/server/persist/BatchedPstmtHolder.java

@@ -110,7 +110,15 @@ public class BatchedPstmtHolder {
     // but still need to close PreparedStatements.
     boolean isError = false;
 
-    for (BatchedPstmt bs : stmtMap.values()) {
+    // if there are Listeners/Controllers that interact with the database,
+    // the flush may get called recursively in executeBatch/postExecute.
+    // which leads that we process stmtMap.values() twice in the loop.
+    // So we copy the values, that we want to flush and clear it immediately.
+    BatchedPstmt[] values = stmtMap.values().toArray(new BatchedPstmt[stmtMap.values().size()]);
+    clear();
+
+    // this loop
+    for (BatchedPstmt bs : values) {
       try {
         if (!isError) {
           bs.executeBatch(getGeneratedKeys);
@@ -139,8 +147,6 @@ public class BatchedPstmtHolder {
       }
     }
 
-    // clear the batch cache
-    clear();
 
     if (firstError != null) {
       String msg = "Error when batch flush on sql: " + errorSql;

src/main/java/io/ebeaninternal/server/persist/DefaultPersister.java

@@ -137,7 +137,7 @@ public final class DefaultPersister implements Persister {
     try {
       return batchControl.execute(sqlUpdate.getSql(), sqlUpdate.isGetGeneratedKeys());
     } catch (SQLException e) {
-      throw new PersistenceException(e);
+      throw transaction.translate(e.getMessage(), e);
     }
   }
 
@@ -150,6 +150,11 @@ public final class DefaultPersister implements Persister {
     return executeOrQueue(new PersistRequestUpdateSql(server, (SpiSqlUpdate) updSql, (SpiTransaction) t, persistExecute));
   }
 
+  @Override
+  public int executeSqlUpdateNow(SpiSqlUpdate updSql, Transaction t) {
+    return executeOrQueue(new PersistRequestUpdateSql(server, updSql, (SpiTransaction) t, persistExecute, true));
+  }
+
   /**
    * Restore draft beans to match live beans given the query.
    */
@@ -407,7 +412,7 @@ public final class DefaultPersister implements Persister {
         if (req.isPersistCascade()) {
           saveAssocMany(req);
         }
-        req.checkUpdatedManysOnly();
+        req.completeUpdate();
       } else {
         update(req);
       }
@@ -467,7 +472,7 @@ public final class DefaultPersister implements Persister {
         request.flagUpdate();
         saveAssocMany(request);
       }
-      request.checkUpdatedManysOnly();
+      request.completeUpdate();
     } else {
       if (request.isInsert()) {
         insert(request);
@@ -501,6 +506,8 @@ public final class DefaultPersister implements Persister {
         // save any associated List held beans
         saveAssocMany(request);
       }
+      request.complete();
+
     } finally {
       request.unRegisterBean();
     }
@@ -534,7 +541,7 @@ public final class DefaultPersister implements Persister {
         saveAssocMany(request);
       }
 
-      request.checkUpdatedManysOnly();
+      request.completeUpdate();
 
     } finally {
       request.unRegisterBean();
@@ -754,7 +761,7 @@ public final class DefaultPersister implements Persister {
               executeSqlUpdate(sqlDelete, t);
             } else {
               // we need to fetch the Id's to delete (recurse or notify L2 cache)
-              List<Object> childIds = many.findIdsByParentId(id, idList, t, null);
+              List<Object> childIds = many.findIdsByParentId(id, idList, t, null, deleteMode.isHard());
               if (!childIds.isEmpty()) {
                 delete(targetDesc, null, childIds, t, deleteMode);
               }
@@ -878,6 +885,7 @@ public final class DefaultPersister implements Persister {
         unloadedForeignKeys.deleteCascade();
       }
     }
+    request.complete();
 
     // return true if using JDBC batch (as we can't tell until the batch is flushed)
     return count;
@@ -896,6 +904,11 @@ public final class DefaultPersister implements Persister {
     BeanDescriptor<?> desc = request.getBeanDescriptor();
     SpiTransaction t = request.getTransaction();
 
+    EntityBean orphanForRemoval = request.getImportedOrphanForRemoval();
+    if (orphanForRemoval != null) {
+      delete(orphanForRemoval, request.getTransaction(), true);
+    }
+
     // exported ones with cascade save
     for (BeanPropertyAssocOne<?> prop : desc.propertiesOneExportedSave()) {
       // check for partial beans
@@ -1052,7 +1065,7 @@ public final class DefaultPersister implements Persister {
         } else {
           // Delete recurse using the Id values of the children
           Object parentId = desc.getId(parentBean);
-          List<Object> idsByParentId = many.findIdsByParentId(parentId, null, t, excludeDetailIds);
+          List<Object> idsByParentId = many.findIdsByParentId(parentId, null, t, excludeDetailIds, deleteMode.isHard());
           if (!idsByParentId.isEmpty()) {
             deleteChildrenById(t, targetDesc, idsByParentId, deleteMode);
           }
@@ -1092,6 +1105,10 @@ public final class DefaultPersister implements Persister {
     // imported ones with save cascade
     for (BeanPropertyAssocOne<?> prop : desc.propertiesOneImportedSave()) {
       // check for partial objects
+      if (prop.isOrphanRemoval() && request.isDirtyProperty(prop)) {
+        request.setImportedOrphanForRemoval(prop);
+      }
+
       if (request.isLoadedProperty(prop)) {
         EntityBean detailBean = prop.getValueAsEntityBean(request.getEntityBean());
         if (detailBean != null
@@ -1108,14 +1125,18 @@ public final class DefaultPersister implements Persister {
 
     for (BeanPropertyAssocOne<?> prop : desc.propertiesOneExportedSave()) {
       if (prop.isOrphanRemoval() && request.isDirtyProperty(prop)) {
-        Object origValue = request.getOrigValue(prop);
-        if (origValue instanceof EntityBean) {
-          delete((EntityBean) origValue, request.getTransaction(), true);
-        }
+        deleteOrphan(request, prop);
       }
     }
   }
 
+  private void deleteOrphan(PersistRequestBean<?> request, BeanPropertyAssocOne<?> prop) {
+    Object origValue = request.getOrigValue(prop);
+    if (origValue instanceof EntityBean) {
+      delete((EntityBean) origValue, request.getTransaction(), true);
+    }
+  }
+
   /**
    * Support for loading any Imported Associated One properties that are not
    * loaded but required for Delete cascade.

src/main/java/io/ebeaninternal/server/persist/ExeCallableSql.java

@@ -48,7 +48,7 @@ class ExeCallableSql {
       }
 
     } catch (SQLException ex) {
-      throw new PersistenceException(ex);
+      throw request.translateSqlException(ex);
 
     } finally {
       if (!batchThisRequest) {

src/main/java/io/ebeaninternal/server/persist/ExeUpdateSql.java

@@ -55,8 +55,8 @@ class ExeUpdateSql {
         request.postExecute();
         return rowCount;
       }
-    } catch (SQLException ex) {
-      throw new PersistenceException(ex);
+    } catch (SQLException e) {
+      throw request.translateSqlException(e);
 
     } finally {
       if (!batchThisRequest) {

src/main/java/io/ebeaninternal/server/persist/dml/InsertHandler.java

@@ -39,7 +39,7 @@ public class InsertHandler extends DmlHandler {
    * A SQL Select used to fetch back the Id where generatedKeys is not
    * supported.
    */
-  private String selectLastInsertedId;
+  private boolean useSelectLastInsertedId;
 
   /**
    * Create to handle the insert execution.
@@ -79,7 +79,7 @@ public class InsertHandler extends DmlHandler {
         useGeneratedKeys = true;
       } else {
         // use a query to get the last inserted id
-        selectLastInsertedId = meta.getSelectLastInsertedId();
+        useSelectLastInsertedId = meta.supportsSelectLastInsertedId();
       }
     }
 
@@ -117,8 +117,7 @@ public class InsertHandler extends DmlHandler {
   }
 
   /**
-   * Execute the insert in a normal non batch fashion. Additionally using
-   * getGeneratedKeys if required.
+   * Execute non batched insert additionally using getGeneratedKeys if required.
    */
   @Override
   public int execute() throws SQLException, OptimisticLockException {
@@ -127,7 +126,7 @@ public class InsertHandler extends DmlHandler {
       // get the auto-increment value back and set into the bean
       getGeneratedKeys();
 
-    } else if (selectLastInsertedId != null) {
+    } else if (useSelectLastInsertedId) {
       // fetch back the Id using a query
       fetchGeneratedKeyUsingSelect();
     }
@@ -167,12 +166,10 @@ public class InsertHandler extends DmlHandler {
    */
   private void fetchGeneratedKeyUsingSelect() throws SQLException {
 
-    Connection conn = transaction.getConnection();
-
     PreparedStatement stmt = null;
     ResultSet rset = null;
     try {
-      stmt = conn.prepareStatement(selectLastInsertedId);
+      stmt = transaction.getConnection().prepareStatement(persistRequest.getSelectLastInsertedId());
       rset = stmt.executeQuery();
       setGeneratedKey(rset);
     } finally {

src/main/java/io/ebeaninternal/server/persist/dml/InsertMeta.java

@@ -38,7 +38,7 @@ public final class InsertMeta {
   /**
    * Used for DB that do not support getGeneratedKeys.
    */
-  private final String selectLastInsertedId;
+  private final boolean supportsSelectLastInsertedId;
 
   private final Bindable shadowFKey;
 
@@ -69,7 +69,7 @@ public final class InsertMeta {
       this.sqlNullId = null;
       this.sqlDraftNullId = null;
       this.supportsGetGeneratedKeys = false;
-      this.selectLastInsertedId = null;
+      this.supportsSelectLastInsertedId = false;
 
     } else {
       // insert sql for db identity or sequence insert
@@ -77,11 +77,11 @@ public final class InsertMeta {
       if (id.getIdentityColumn() == null) {
         this.identityDbColumns = new String[]{};
         this.supportsGetGeneratedKeys = false;
-        this.selectLastInsertedId = null;
+        this.supportsSelectLastInsertedId = false;
       } else {
         this.identityDbColumns = new String[]{id.getIdentityColumn()};
         this.supportsGetGeneratedKeys = dbPlatform.getDbIdentity().isSupportsGetGeneratedKeys();
-        this.selectLastInsertedId = desc.getSelectLastInsertedId();
+        this.supportsSelectLastInsertedId = desc.supportsSelectLastInsertedId();
       }
       this.sqlNullId = genSql(true, tableName, false);
       this.sqlDraftNullId = desc.isDraftable() ? genSql(true, draftTableName, true) : sqlNullId;
@@ -116,15 +116,11 @@ public final class InsertMeta {
   }
 
   /**
-   * Returns sql that is used to fetch back the last inserted id. This will
-   * return null if it should not be used.
-   * <p>
-   * This is only for DB's that do not support getGeneratedKeys. For MS
-   * SQLServer 2000 this could return "SELECT (at)(at)IDENTITY as id".
-   * </p>
+   * Return true if we should use a SQL query to return the generated key.
+   * This can not be used with JDBC batch mode.
    */
-  public String getSelectLastInsertedId() {
-    return selectLastInsertedId;
+  public boolean supportsSelectLastInsertedId() {
+    return supportsSelectLastInsertedId;
   }
 
   /**

src/main/java/io/ebeaninternal/server/query/CQueryBuilder.java

@@ -138,11 +138,14 @@ class CQueryBuilder {
     // wrap as - delete from table where id in (select id ...)
     String sql = buildSql(null, request, predicates, sqlTree).getSql();
     sql = request.getBeanDescriptor().getDeleteByIdInSql() + "in (" + sql + ")";
-    String alias = (rootTableAlias == null) ? "t0" : rootTableAlias;
-    sql = aliasReplace(sql, alias);
+    sql = aliasReplace(sql, alias(rootTableAlias));
     return sql;
   }
 
+  private String alias(String rootTableAlias) {
+    return (rootTableAlias == null) ? "t0" : rootTableAlias;
+  }
+
   private <T> String buildUpdateSql(OrmQueryRequest<T> request, String rootTableAlias, CQueryPredicates predicates, SqlTree sqlTree) {
 
     StringBuilder sb = new StringBuilder(200);
@@ -160,8 +163,7 @@ class CQueryBuilder {
     // wrap as - update table set ... where id in (select id ...)
     String sql = buildSqlUpdate(null, request, predicates, sqlTree).getSql();
     sql = updateClause + " " + request.getBeanDescriptor().getWhereIdInSql() + "in (" + sql + ")";
-    String alias = (rootTableAlias == null) ? "t0" : rootTableAlias;
-    sql = aliasReplace(sql, alias);
+    sql = aliasReplace(sql, alias(rootTableAlias));
     return sql;
   }
 
@@ -209,7 +211,12 @@ class CQueryBuilder {
    */
   <T> CQueryFetchSingleAttribute buildFetchIdsQuery(OrmQueryRequest<T> request) {
 
-    request.getQuery().setSelectId();
+    SpiQuery<T> query = request.getQuery();
+    query.setSelectId();
+    BeanDescriptor<T> desc = request.getBeanDescriptor();
+    if (!query.isIncludeSoftDeletes() && desc.isSoftDelete()) {
+      query.addSoftDeletePredicate(desc.getSoftDeletePredicate(alias(query.getAlias())));
+    }
     return buildFetchAttributeQuery(request);
   }
 
@@ -217,7 +224,7 @@ class CQueryBuilder {
    * Return the history support if this query needs it (is a 'as of' type query).
    */
   <T> CQueryHistorySupport getHistorySupport(SpiQuery<T> query) {
-    return query.getTemporalMode() != SpiQuery.TemporalMode.CURRENT ? historySupport : null;
+    return query.getTemporalMode().isHistory() ? historySupport : null;
   }
 
   /**
@@ -417,7 +424,9 @@ class CQueryBuilder {
 
     BeanDescriptor<?> desc = request.getBeanDescriptor();
     try {
-      PreparedStatement statement = connection.prepareStatement(sql);
+      // For SqlServer we need either "selectMethod=cursor" in the connection string or fetch explicitly a cursorable
+      // statement here by specifying ResultSet.CONCUR_UPDATABLE
+      PreparedStatement statement = connection.prepareStatement(sql,ResultSet.TYPE_FORWARD_ONLY, dbPlatform.isSupportsResultSetConcurrencyModeUpdatable() ? ResultSet.CONCUR_UPDATABLE : ResultSet.CONCUR_READ_ONLY);
       predicates.bind(statement, connection);
 
       ResultSet resultSet = statement.executeQuery();

src/main/java/io/ebeaninternal/server/query/DbOrderByTrim.java

@@ -4,7 +4,7 @@ import java.util.regex.Pattern;
 
 class DbOrderByTrim {
 
-  private static final Pattern orderByTrim = Pattern.compile("(?i)\\b asc\\b|\\b desc\\b");
+  private static final Pattern orderByTrim = Pattern.compile("(?i)\\b asc\\b|\\b desc\\b|\\b nulls first\\b|\\b nulls last\\b");
 
   /**
    * Convert the dbOrderBy clause to be safe for adding to select or distinct on.

src/main/java/io/ebeaninternal/server/query/DefaultDbSqlContext.java

@@ -70,6 +70,11 @@ class DefaultDbSqlContext implements DbSqlContext {
     this.fromForUpdate = fromForUpdate;
   }
 
+  @Override
+  public boolean isIncludeSoftDelete() {
+    return alias.isIncludeSoftDelete();
+  }
+
   @Override
   public void appendFromForUpdate() {
     if (fromForUpdate != null) {
@@ -99,11 +104,6 @@ class DefaultDbSqlContext implements DbSqlContext {
     return encryptedProps.toArray(new BeanProperty[encryptedProps.size()]);
   }
 
-  @Override
-  public String peekJoin() {
-    return joinStack.peek();
-  }
-
   @Override
   public void popJoin() {
     joinStack.pop();
@@ -206,11 +206,6 @@ class DefaultDbSqlContext implements DbSqlContext {
     return alias.getTableAliasManyWhere(prefix);
   }
 
-  @Override
-  public void pushSecondaryTableAlias(String alias) {
-    tableAliasStack.push(alias);
-  }
-
   @Override
   public String getRelativePrefix(String propName) {
 

src/main/java/io/ebeaninternal/server/query/SqlTreeAlias.java

@@ -1,6 +1,7 @@
 package io.ebeaninternal.server.query;
 
 import io.ebean.util.SplitName;
+import io.ebeaninternal.api.SpiQuery;
 
 import java.util.HashMap;
 import java.util.HashSet;
@@ -17,6 +18,8 @@ class SqlTreeAlias {
 
   private static final Pattern TABLE_ALIAS_REPLACE = Pattern.compile("${}", Pattern.LITERAL);
 
+  private final SpiQuery.TemporalMode temporalMode;
+
   private int counter;
 
   private int manyWhereCounter;
@@ -33,8 +36,9 @@ class SqlTreeAlias {
 
   private final String rootTableAlias;
 
-  SqlTreeAlias(String rootTableAlias) {
+  SqlTreeAlias(String rootTableAlias, SpiQuery.TemporalMode temporalMode) {
     this.rootTableAlias = rootTableAlias;
+    this.temporalMode = temporalMode;
   }
 
   /**
@@ -211,4 +215,8 @@ class SqlTreeAlias {
   boolean isIncludeJoins() {
     return !aliasMap.isEmpty() || !manyWhereAliasMap.isEmpty();
   }
+
+  boolean isIncludeSoftDelete() {
+    return temporalMode == SpiQuery.TemporalMode.SOFT_DELETED;
+  }
 }