Fix Transaction Flushing when ID Property is Loaded (#1450)

* Fix for unintentianal flush when ID is loaded

* fix duplicateKey Exception

* higher id

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

@@ -356,7 +356,15 @@ public final class PersistRequestBean<T> extends PersistRequest implements BeanP
 
   private boolean flushBatchOnGetter(int propertyIndex) {
     // propertyIndex of -1 the Id property, no flush for get Id on UPDATE
-    return propertyIndex == -1 ? type == Type.INSERT : beanDescriptor.isGeneratedProperty(propertyIndex);
+    if (propertyIndex == -1) {
+      if (beanDescriptor.isIdLoaded(intercept)) {
+        return false;
+      } else {
+        return type == Type.INSERT;
+      }
+    } else {
+      return beanDescriptor.isGeneratedProperty(propertyIndex);
+    }
   }
 
   public void setSkipBatchForTopLevel() {

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

@@ -3160,6 +3160,10 @@ public class BeanDescriptor<T> implements BeanType<T>, STreeType {
   public boolean hasIdPropertyOnly(EntityBeanIntercept ebi) {
     return ebi.hasIdOnly(idPropertyIndex);
   }
+  
+  public boolean isIdLoaded(EntityBeanIntercept ebi) {
+    return ebi.isLoadedProperty(idPropertyIndex);
+  }
 
   public boolean hasIdValue(EntityBean bean) {
     return (idProperty != null && !DmlUtil.isNullOrZero(idProperty.getValue(bean)));