Deadlock Exception
please help.
we are developing and LMS system on jboss with entity bean and struts.
sometime when we try to get somepage we get this exception :
com.objectj.jsa.proxy.ProxyException: null; CausedByException is:
[java] Application deadlock detected: Two or more transactions contention.
[java] 17:33:27,370 ERROR [STDERR] com.objectj.jsa.proxy.ProxyException: null; CausedByException is:
[java] Application deadlock detected: Two or more transactions contention.
[java] 17:33:27,400 ERROR [STDERR] at com.objectj.nexus.lms.proxy.ProxySessionEJB.allPassLessons(ProxySessionEJB.java:1085)
[java] 17:33:27,400 ERROR [STDERR] at sun.reflect.GeneratedMethodAccessor176.invoke(Unknown Source)
[java] 17:33:27,400 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[java] 17:33:27,400 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:324)
[java] 17:33:27,410 ERROR [STDERR] at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:629)
[java] 17:33:27,450 ERROR [STDERR] at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:186)
[java] 17:33:27,450 ERROR [STDERR] at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:72)
[java] 17:33:27,450 ERROR [STDERR] at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84)
[java] 17:33:27,450 ERROR [STDERR] at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:243)
[java] 17:33:27,540 ERROR [STDERR] at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:104)
[java] 17:33:27,580 ERROR [STDERR] at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:117)
[java] 17:33:27,580 ERROR [STDERR] at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:191)
[java] 17:33:27,580 ERROR [STDERR] at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
[java] 17:33:27,580 ERROR [STDERR] at org.jboss.ejb.StatelessSessionContainer.internalInvoke(StatelessSessionContainer.java:322)
[java] 17:33:27,690 ERROR [STDERR] at org.jboss.ejb.Container.invoke(Container.java:674)
[java] 17:33:27,720 ERROR [STDERR] at org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invoke(BaseLocalProxyFactory.java:353)
[java] 17:33:27,720 ERROR [STDERR] at org.jboss.ejb.plugins.local.StatelessSessionProxy.invoke(StatelessSessionProxy.java:83)
[java] 17:33:27,730 ERROR [STDERR] at $Proxy143.allPassLessons(Unknown Source)
I can't realize why i should get this exception ?
can anyone help me step by step , it is very important for me .
Thanks all.