Hi everyone, I am a newbie in JBOSS, so any help or suggestion would be very much appreciated :)

Previously I found that in my application, when there are 2 threads accessing the entity bean(which in turns access the mysql database), deadlock occurs even they were both just trying to read, so I changed the default configuration from pessimistic lock to SimpleReadWriteEJBLock by the following configuration in jboss.xml:
<container-configuration extends="Standard CMP 2.x EntityBean">
<container-name>Standard CMP 2.x EntityBean</container-name> <locking-policy>org.jboss.ejb.plugins.lock.SimpleReadWriteEJBLock</locking-policy>
</container-configuration>

after making this change, and rerunning the application, instead of deadlock, I get the following transaction timeout error from JBOSS:

13:54:06,906 WARN [TransactionImpl] Transaction TransactionImpl:XidImpl[FormatId=257, GlobalId=andrewspc/108, BranchQual=, localId=108] timed out. status=STATUS_ACTIVE
13:54:07,140 WARN [TransactionImpl] Transaction TransactionImpl:XidImpl[FormatId=257, GlobalId=andrewspc/110, BranchQual=, localId=110] timed out. status=STATUS_ACTIVE
13:54:07,203 ERROR [LogInterceptor] TransactionRolledbackLocalException in method: public abstract java.lang.Integer com.patientrack.ejb.entityBean.AdmissionLocal.getAdmsnPK(), causedBy:
javax.ejb.EJBException: Transaction marked for rollback - probably a timeout.
at org.jboss.ejb.plugins.lock.SimpleReadWriteEJBLock.checkTransaction(SimpleReadWriteEJBLock.java:326)
at org.jboss.ejb.plugins.lock.SimpleReadWriteEJBLock.waitAWhile(SimpleReadWriteEJBLock.java:205)
at org.jboss.ejb.plugins.lock.SimpleReadWriteEJBLock.getWriteLock(SimpleReadWriteEJBLock.java:183)
at org.jboss.ejb.plugins.lock.SimpleReadWriteEJBLock.schedule(SimpleReadWriteEJBLock.java:89)
at org.jboss.ejb.plugins.EntityLockInterceptor.invoke(EntityLockInterceptor.java:85)
at org.jboss.ejb.plugins.EntityCreationInterceptor.invoke(EntityCreationInterceptor.java:53)
at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:48)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:106)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:335)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:166)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:153)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:192)
at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
at org.jboss.ejb.EntityContainer.internalInvoke(EntityContainer.java:514)
at org.jboss.ejb.Container.invoke(Container.java:873)
at org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invoke(BaseLocalProxyFactory.java:415)
at org.jboss.ejb.plugins.local.EntityProxy.invoke(EntityProxy.java:50)
at $Proxy123.getAdmsnPK(Unknown Source)
at com.patientrack.ejb.sessionBean.AdmissionManagerBean.convertAdmissionLocalToAdmission(AdmissionManagerBean.java:3463)
at com.patientrack.ejb.sessionBean.AdmissionManagerBean.loadAdmissionForAdmsnPk(AdmissionManagerBean.java:1385)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.invocation.Invocation.performCall(Invocation.java:345)
at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:214)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:149)
at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:154)
at org.jboss.webservice.server.ServiceEndpointInterceptor.invoke(ServiceEndpointInterceptor.java:54)
at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:48)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:106)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:335)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:166)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:153)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:192)
at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
at


has anyone encountered this kind of problems before? Is there any configuration that I need to pay attention to(JBOSS, JDBC, or MYSQL settings)? Help PLEASE...

THANKS!