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Envers 4 NullPointerException

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kjordan2001

Post subject: Envers 4 NullPointerException

Posted: Tue Jan 03, 2012 6:33 pm

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Joined: Wed Nov 21, 2007 10:24 am
Posts: 25

I'm getting a NullPointerException on line 47 of EnversPreCollectionRemoveEventListenerImpl very consistently. I wasn't sure if it was due to lazy collections or not, but it seems that it fails if they're eagerly fetched or lazily fetched. I'm guessing it has something to do with getLoadedPersister() returning a null value since the comments for it say "This is only available late during the flush cycle". The stack trace is

Quote:

java.lang.NullPointerException
at org.hibernate.envers.event.EnversPreCollectionRemoveEventListenerImpl.onPreRemoveCollection(EnversPreCollectionRemoveEventListenerImpl.java:47)
at org.hibernate.action.internal.CollectionRemoveAction.preRemove(CollectionRemoveAction.java:143)
at org.hibernate.action.internal.CollectionRemoveAction.execute(CollectionRemoveAction.java:104)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:273)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:265)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:188)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:323)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1081)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:315)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175)
at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:73)
... 120 more

Last edited by kjordan2001 on Fri Jan 13, 2012 10:44 am, edited 1 time in total.

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kjordan2001

Post subject: Re: Envers4 NullPointerException in PreCollectionRemove Listener

Posted: Tue Jan 03, 2012 7:09 pm

Beginner

Joined: Wed Nov 21, 2007 10:24 am
Posts: 25

In some of my setters for collections where I have orphanRemoval I'm doing it like

Code:

public void setMyCollection(List<MyType> value) {
if (myCollection == null) {
   myCollection = new ArrayList<MyType>();
}
myCollection.clear();
if (value != null) {
   myCollection.addAll(value);
}
}

to satisfy Hibernate's monitoring of collections. I'm not sure if this is somehow causing it, but I don't think Hibernate liked it before when it was just

Code:

myCollection = value;

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kjordan2001

Post subject: Re: Envers4 NullPointerException in PreCollectionRemove Listener

Posted: Fri Jan 13, 2012 10:44 am

Beginner

Joined: Wed Nov 21, 2007 10:24 am
Posts: 25

Does anyone have any ideas? I rolled back to 3.6.x and it worked again so I think it's a bug in Envers 4. I created a bug in JIRA https://hibernate.onjira.com/browse/HHH-6960 but no response there yet either. Has anyone else encountered any problems with Envers 4?

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