FIX: Changelog-oldValue did not work for Json mutable properties

ebean-core/src/test/java/org/tests/changelog/TestChangeLog.java

@@ -16,10 +16,13 @@ import io.ebean.event.changelog.ChangeLogRegister;
 import io.ebean.event.changelog.ChangeSet;
 import io.ebean.event.changelog.ChangeType;
 import io.ebean.event.changelog.TxnState;
+import io.ebeantest.LoggedSql;
+
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.tests.model.basic.EBasicChangeLog;
+import org.tests.model.json.PlainBean;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -130,7 +133,31 @@ public class TestChangeLog extends BaseTestCase {
     assertThat(change.getEvent()).isEqualTo(ChangeType.DELETE);
     assertThat(change.getData()).isNull();
   }
+  
+  @Test
+  public void testWithJsonMutationDetection() {
 
+    EBasicChangeLog bean = new EBasicChangeLog();
+    bean.setName(null);
+    bean.setShortDescription("hello");
+    PlainBean jsonBean = new PlainBean();
+    bean.setPlainBean(jsonBean);
+    jsonBean.setName("A");    
+    server.save(bean);
+    
+    BeanChange change = firstChange();
+    assertThat(change.getEvent()).isEqualTo(ChangeType.INSERT);
+    
+    jsonBean.setName("B");
+    LoggedSql.start();
+    server.save(bean);
+    assertThat(LoggedSql.stop()).isNotEmpty();
+    
+    change = firstChange();
+    assertThat(change.getEvent()).isEqualTo(ChangeType.UPDATE);
+    assertThat(change.getData()).contains("\"plainBean\":{\"name\":\"B\"");
+    assertThat(change.getOldData()).contains("\"plainBean\":{\"name\":\"A\"");
+  }
   private Database createServer() {
 
     DatabaseConfig config = new DatabaseConfig();

ebean-core/src/test/java/org/tests/model/basic/EBasicChangeLog.java

@@ -2,6 +2,7 @@ package org.tests.model.basic;
 
 import io.ebean.annotation.Cache;
 import io.ebean.annotation.ChangeLog;
+import io.ebean.annotation.DbJson;
 import io.ebean.annotation.ReadAudit;
 import io.ebean.annotation.WhenCreated;
 import io.ebean.annotation.WhenModified;
@@ -12,11 +13,16 @@ import javax.persistence.Entity;
 import javax.persistence.Id;
 import javax.persistence.Version;
 import javax.validation.constraints.Size;
+
+import org.tests.model.json.PlainBean;
+
+import static io.ebean.annotation.MutationDetection.SOURCE;
+
 import java.sql.Timestamp;
 
 @Cache(enableQueryCache = true)
 @ReadAudit
-@ChangeLog(updatesThatInclude = {"name", "shortDescription"})
+@ChangeLog(updatesThatInclude = {"name", "shortDescription", "plainBean"})
 @Entity
 public class EBasicChangeLog {
 
@@ -46,6 +52,9 @@ public class EBasicChangeLog {
 
   @Version
   Long version;
+  
+  @DbJson(length = 500, mutationDetection = SOURCE) // such that we can rebuild old values
+  PlainBean plainBean;
 
   public Long getId() {
     return id;
@@ -118,4 +127,12 @@ public class EBasicChangeLog {
   public void setVersion(Long version) {
     this.version = version;
   }
+
+  public PlainBean getPlainBean() {
+    return plainBean;
+  }
+
+  public void setPlainBean(PlainBean plainBean) {
+    this.plainBean = plainBean;
+  }
 }