Hi

I am getting the following snippet of exception:

java.lang.NullPointerException
 at org.jboss.envers.event.VersionsEventListener.onPreRemoveCollection(VersionsEventListener.java:183)
 at org.hibernate.action.CollectionRemoveAction.preRemove(CollectionRemoveAction.java:115)
 at org.hibernate.action.CollectionRemoveAction.execute(CollectionRemoveAction.java:81)
 at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:169)
 at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)

I have added the following event listeners in my session factory:

 <property name="eventListeners">
 <map>
 <entry key="post-insert" value-ref="enversEventListener"/>
 <entry key="post-update" value-ref="enversEventListener"/>
 <entry key="post-delete" value-ref="enversEventListener"/>
 <entry key="post-collection-recreate" value-ref="enversEventListener"/>
 <entry key="pre-collection-remove" value-ref="enversEventListener"/>
 <entry key="pre-collection-update" value-ref="enversEventListener"/>

 </map>

My test case basically creates a contact object with a set of addresses, phone numbers and notes. I perform the following operation for the exception to arise:

PersonalContact pc = (PersonalContact) ContactFactory.getInstance().createContact(ContactType.personalcontact);
 Contact personalContactCreated = contactApplicationService.createContact(pc);

 ((PersonalContact)personalContactCreated).setFirstname("CHANGED NAME");
 contactApplicationService.updateContact(personalContactCreated);
 List<? extends Contact> history = contactApplicationService.showHistory(personalContactCreated.getId(), true);
 System.out.println(history);
 assertNotNull(history);
 assertEquals(2, history.size());

I have implemented the @Versioned according to the documentation online. Any help would be appreciated.