Hi, We have an application that uses JMS/MDB to send messages, processes these messages and persists derived (from messages) Hibernate-objects. Running a heavy load synchornise works fine but now that we use JMS/MDB on JBoss 4.0.2 we get the following errors which occurs now and again: java.lang.IllegalArgumentException: Illegal load factor: 0.75 at java.util.HashMap.(HashMap.java:168) at java.util.HashMap.(HashMap.java:190) at org.hibernate.engine.PersistenceContext.(PersistenceContext.java:171) at org.hibernate.impl.SessionImpl.(SessionImpl.java:225) at org.hibernate.impl.SessionFactoryImpl.openSession(SessionFactoryImpl.java:462) at org.hibernate.impl.SessionFactoryImpl.openSession(SessionFactoryImpl.java:486) at org.hibernate.impl.SessionFactoryImpl.openSession(SessionFactoryImpl.java:494) at sun.reflect.GeneratedMethodAccessor237.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.springframework.orm.hibernate3.LocalSessionFactoryBean$TransactionAwareInvocationHandler.invoke(LocalSessionFactoryBean.java:988) at $Proxy64.openSession(Unknown Source) at org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:395) at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:281) at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:217) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:89) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:174) at $Proxy68.findBerichtByActiviteitId(Unknown Source) at nl.ictu.spg.service.lo3.gbanetwork.LO3BerichtUtil.locateLO3Bericht(LO3BerichtUtil.java:421) at nl.ictu.spg.service.lo3.gbanetwork.LO3BerichtActiviteit.(LO3BerichtActiviteit.java:129) at nl.ictu.spg.domain.activityflow.ActivityflowFactory.initializeWorkFlowActiviteit(ActivityflowFactory.java:160) at nl.ictu.spg.domain.activityflow.ActivityflowFactory.loadWorkFlowActiviteit(ActivityflowFactory.java:136) at nl.ictu.spg.service.lo3.gbanetwork.LO3BerichtDispatcher.dispatch(LO3BerichtDispatcher.java:37) at nl.ictu.spg.integration.idvmessageprocessing.ejb.SpGBerichtDispatcherMDB.dispatchIndividualId(SpGBerichtDispatcherMDB.java:98) at nl.ictu.spg.integration.idvmessageprocessing.ejb.SpGBerichtDispatcherMDB.dispatchArrayOfIds(SpGBerichtDispatcherMDB.java:108) at nl.ictu.spg.integration.idvmessageprocessing.ejb.SpGBerichtDispatcherMDB.onMessage(SpGBerichtDispatcherMDB.java:79) at sun.reflect.GeneratedMethodAccessor447.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jboss.invocation.Invocation.performCall(Invocation.java:345) at org.jboss.ejb.MessageDrivenContainer$ContainerInterceptor.invoke(MessageDrivenContainer.java:475) at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:185) at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:48) at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:105) at org.jboss.ejb.plugins.AbstractTxInterceptorBMT.invokeNext(AbstractTxInterceptorBMT.java:153) at org.jboss.ejb.plugins.MessageDrivenTxInterceptorBMT.invoke(MessageDrivenTxInterceptorBMT.java:32) at org.jboss.ejb.plugins.MessageDrivenInstanceInterceptor.invoke(MessageDrivenInstanceInterceptor.java:87) at org.jboss.ejb.plugins.RunAsSecurityInterceptor.invoke(RunAsSecurityInterceptor.java:94) at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:192) at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122) at org.jboss.ejb.MessageDrivenContainer.internalInvoke(MessageDrivenContainer.java:389) at org.jboss.ejb.Container.invoke(Container.java:873) at org.jboss.ejb.plugins.jms.JMSContainerInvoker.invoke(JMSContainerInvoker.java:1090) at org.jboss.ejb.plugins.jms.JMSContainerInvoker$MessageListenerImpl.onMessage(JMSContainerInvoker.java:1392) at org.jboss.jms.asf.StdServerSession.onMessage(StdServerSession.java:256) at org.jboss.mq.SpyMessageConsumer.sessionConsumerProcessMessage(SpyMessageConsumer.java:904) at org.jboss.mq.SpyMessageConsumer.addMessage(SpyMessageConsumer.java:160) at org.jboss.mq.SpySession.run(SpySession.java:333) at org.jboss.jms.asf.StdServerSession.run(StdServerSession.java:180) at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:748) at java.lang.Thread.run(Thread.java:534) . What could be the problem? Memory shortage on JBoss, not using Hibernate or Spring correctly? Hibernate 3.0.5 Spring 1.2.3 JBoss 4.0.2 JDK 1.4.2_08 Any ideas or suggestions? Thanks, Maarten View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3968832#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...