Hi all,
we are running JBoss-2.4.4_Tomcat-4.0.1-beta/jboss
with version 1.0 of the persistence manager from MVCSoft.
after experiencing OutOfMemory problems with a batch
program which sucks data out of a legacy database and
into postgresql through the EJB layer, i ran up Optimizeit
and discovered that the source of the "leak" is instances
of the following class are never getting garbage collected.
org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock
I wrote a simple test client which just repeatedly called a
stateless session bean method called createAddress which
creates a simple cmp (no cmr) entity bean. The same
problem occurred. Please refer to the attached file (data.txt)
for the allocation backtrace of
org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock
in this simple test.
I've tried debugging this but to be perfectly honest I'm
a little out of my depth here. It appears the reference
counts for the locks never reaches zero and therefore
the removeLockRef in the BeanLockManager never
actually removes the lock from the map.
If anyone can help me on this, I would really appreciate
it. I'm not quite sure what to do next. Any suggestions
would be great.
regards,
Colin Daly.
Allocation backtraces for class org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock. application
-------------------------------------------------------------------------------------------------
Backtrace of code allocating org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock
--------------------------------------------------------------------------------
4908 instances of org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock allocated.
100.0% sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run() (starting in TCPTransport.java:574)
100.0% sun.rmi.transport.tcp.TCPTransport.handleMessages() (starting in TCPTransport.java:444)
100.0% sun.rmi.transport.Transport.serviceCall() (starting in Transport.java:106)
100.0% sun.rmi.transport.Transport$1.run() (starting in Transport.java:151)
100.0% sun.rmi.server.UnicastServerRef.dispatch() (starting in UnicastServerRef.java:183)
100.0% org.jboss.ejb.plugins.jrmp.server.JRMPContainerInvoker.invoke() (starting in JRMPContainerInvoker.java:401)
100.0% org.jboss.ejb.StatelessSessionContainer.invoke() (starting in StatelessSessionContainer.java:286)
100.0% org.jboss.ejb.plugins.LogInterceptor.invoke() (starting in LogInterceptor.java:151)
100.0% org.jboss.ejb.plugins.SecurityInterceptor.invoke() (starting in SecurityInterceptor.java:116)
100.0% org.jboss.ejb.plugins.TxInterceptorCMT.invoke() (starting in TxInterceptorCMT.java:100)
100.0% org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions() (starting in TxInterceptorCMT.java:233)
100.0% org.jboss.ejb.plugins.TxInterceptorCMT.invokeNext() (starting in TxInterceptorCMT.java:134)
100.0% org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke() (starting in StatelessSessionInstanceInterceptor.java:73)
100.0% org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke() (starting in StatelessSessionContainer.java:510)
100.0% au.com.ucw.cop.ejb.PartyOrderControllerBean.createTestAddress() (starting in PartyOrderControllerBean.java:670)
100.0% au.com.ucw.cop.ejb.PartyOrderControllerBean.createAddress() (starting in PartyOrderControllerBean.java:936)
100.0% $Proxy13.create()
100.0% org.jboss.ejb.plugins.local.BaseLocalContainerInvoker$HomeProxy.invoke() (starting in BaseLocalContainerInvoker.java:341)
100.0% org.jboss.ejb.plugins.local.BaseLocalContainerInvoker.invokeHome() (starting in BaseLocalContainerInvoker.java:227)
100.0% org.jboss.ejb.EntityContainer.invokeHome() (starting in EntityContainer.java:421)
100.0% org.jboss.ejb.plugins.LogInterceptor.invokeHome() (starting in LogInterceptor.java:85)
100.0% org.jboss.ejb.plugins.SecurityInterceptor.invokeHome() (starting in SecurityInterceptor.java:91)
100.0% org.jboss.ejb.plugins.TxInterceptorCMT.invokeHome() (starting in TxInterceptorCMT.java:86)
100.0% org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions() (starting in TxInterceptorCMT.java:233)
100.0% org.jboss.ejb.plugins.TxInterceptorCMT.invokeNext() (starting in TxInterceptorCMT.java:134)
100.0% org.jboss.ejb.plugins.EntityLockInterceptor.invokeHome() (starting in EntityLockInterceptor.java:97)
100.0% org.jboss.ejb.plugins.EntityInstanceInterceptor.invokeHome() (starting in EntityInstanceInterceptor.java:136)
100.0% org.jboss.ejb.plugins.EntitySynchronizationInterceptor.invokeHome() (starting in EntitySynchronizationInterceptor.java:231)
100.0% org.jboss.ejb.BeanLockManager.getLock() (starting in BeanLockManager.java:54)
