Re: [gatein-dev] JCR ConcurrentModificationExceptions with WSRP
modify JCRPersister to have something that will help you to understand what's going on
such as :
public static class JCRPersister {
/** . */
private Exception owner;
/** . */
private final Lock lock = new ReentrantLock();
private void _save() {
// What save was doing before
}
public void save()
{
if (lock.tryLock()) {
owner = new Exception();
try {
_save();
} finally {
lock.unlock();
owner = null;
}
} else {
System.out.println("Caught attempt to double save, my stack
trace");
new Exception().printStackTrace(System.out);
System.out.println("Owner stack trace");
owner.printStackTrace(System.out);
}
}
}
On Nov 8, 2010, at 8:52 PM, Matt Wringe wrote:
Hi,
We are seeing occasional ConcurrentModificationException when accessing
certain portlets over wsrp. We already have a jira opened for this
https://jira.jboss.org/browse/GTNWSRP-84
The strange thing is that we have only been able to reproduce it on
linux machines, it doesn't appear to be reproducible on mac machines.
Has anyone seen issues like this before with respect to the jcr and
concurrent modifications? Or a jcr expert have a better idea to what the
issue is?
It looks like the wsrp jcr layer needs a bit of work to make it more
thread safe.
> Caused by: java.util.ConcurrentModificationException
> at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
> at java.util.AbstractList$Itr.next(AbstractList.java:343)
> at
org.exoplatform.services.jcr.impl.core.SessionDataManager.validate(SessionDataManager.java:1421)
> at
org.exoplatform.services.jcr.impl.core.SessionDataManager.commit(SessionDataManager.java:1332)
> at org.exoplatform.services.jcr.impl.core.ItemImpl.save(ItemImpl.java:681)
> at org.exoplatform.services.jcr.impl.core.SessionImpl.save(SessionImpl.java:935)
> at
org.gatein.portal.wsrp.state.JCRPersister$WSRPSessionLifeCycle.save(JCRPersister.java:191)
> at org.chromattic.core.jcr.SessionWrapperImpl.save(SessionWrapperImpl.java:263)
> at org.chromattic.core.DomainSessionImpl._save(DomainSessionImpl.java:583)
> at org.chromattic.core.DomainSession.save(DomainSession.java:146)
> at
org.chromattic.core.api.ChromatticSessionImpl.save(ChromatticSessionImpl.java:223)
> at org.gatein.portal.wsrp.state.JCRPersister.closeSession(JCRPersister.java:111)
> at
org.gatein.portal.wsrp.state.consumer.JCRConsumerRegistry.update(JCRConsumerRegistry.java:116)
> at
org.gatein.wsrp.consumer.registry.AbstractConsumerRegistry.updateProducerInfo(AbstractConsumerRegistry.java:249)
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