How to check whether entity has been persisted in the current transaction

Question

Hello,
I am porting functionality which relay heavily on lifecycle of the entity.
For example methods like these:
* returns true if the instance has been modified, deleted or newly made
* persistent in the current transaction
public boolean isModified(final EntityObject entity)
public boolean isDeleted(final EntityObject entity)
For some of these callsI have found how to port them to toplink und just want to validate that this is the right way:
protected static UnitOfWork getUnitOfWork(EntityManager entityManager) {
return ((JpaEntityManager) (entityManager.getDelegate())).getUnitOfWork();
public static boolean isModified(EntityManager entityManager, Object entity) {
UnitOfWorkChangeSet set = getUnitOfWork(entityManager).getCurrentChanges();
ObjectChangeSet oset = set.getObjectChangeSetForClone(entity);
return !oset.getChanges().isEmpty() || oset.isNew();
public static boolean isDeleted(EntityManager entityManager, Object entity) {
UnitOfWorkChangeSet set = getUnitOfWork(entityManager).getCurrentChanges();
return set.getDeletedObjects().keySet().contains(entity);
but I did not find how to do following with the eclipselink:
* returns true, if the given entity object has been persistet during the
* current transaction
* @param entity
* @return true, if the given entity object has been persistet during the
* current transaction
public boolean isPersistent(final EntityObject entity)
Questions:
- how can I check whether the entity is persistent in the sense already stored in the DB ?
- how can I check whether the entity has been persisted in the current transaction ?
Thanks in advance.
Andre Teshler

Answer 1

Hi Andre,
In Eclipse link there are Entity listeners which will define the life cycle events like preInsert(),postInsert() etc.On successful insertion of an object its postInsert() life cycle method gets called.If you have to validate whether object inserted successfully then best place is to override the postInsert() and check for the existence of the record.All the event life cycle methods take a DescriptorEvent as parameter which will give handle to API as given below.In the same method you can check if this insert operation succeeded in the same transaction.
package model;
import java.util.Vector;
import org.eclipse.persistence.descriptors.DescriptorEvent;
import org.eclipse.persistence.descriptors.DescriptorEventAdapter;
import org.eclipse.persistence.descriptors.DescriptorEventListener;
import org.eclipse.persistence.internal.sessions.ObjectChangeSet;
public class SampleEntityLIstener extends DescriptorEventAdapter {
public SampleEntityLIstener() {
super();
public void postInsert(DescriptorEvent event) {
event.getRecord().containsKey("pass the object");
event.getChangeSet().getUOWChangeSet();
public void preInsert(DescriptorEvent event) {
Once you implement the DescriptorEventListener,need to register with the Entity so that life cycle methods gets called and respective business logic gets executed.
Hope this helps,
Regards,
P.Vinay Kumar