I tried not closing the sessions explicitly. Still leaks, but the top of the trace has changed: Explicit session close: anonymous wrote : | org.jboss.resource.connectionmanager.xa.JcaXAResourceWrapper.end(Xid, int) | com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.delistResource(XAResource, int) | org.jboss.resource.adapter.jms.JmsSession.close() | com.acme.gateway.util.jms.JmsOperation.execute() | No explicit session close: anonymous wrote : | org.jboss.resource.connectionmanager.xa.JcaXAResourceWrapper.end(Xid, int) | com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.delistResource(XAResource, int) | org.jboss.resource.adapter.jms.JmsSessionFactoryImpl.close() | com.acme.gateway.util.jms.JmsOperation.execute() | I didn't see any option to increase the maximum depth of the allocation traces in YourKit, so I tried downloading JProfiler. It too seems to cut off in the same place. I wasn't able to find the option to increase the maximum depth in JProfiler either, do you happen to know where it might be located? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4118725#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...