I have a problem with random "inserting an already existing bean" errors at a client - about every month or so.

the error occurs on a line where i am not doing any data inserts of my own. The error happens on the home.create()

Object ref2 = ctx.lookup("ejb/DestinationGroupSubstituteAccess");
javax.ejb.EJBHome substituteHome = (javax.ejb.EJBHome) PortableRemoteObject.narrow(ref2, javax.ejb.EJBHome.class);
EJBObject substituteAccess = substituteHome.create();

The stack dump is as follows

2004-11-12 07:36:21,426 ERROR [org.jboss.ejb.plugins.LogInterceptor] TransactionRolledbackException, causedBy:
java.lang.IllegalStateException: INSERTING AN ALREADY EXISTING BEAN, ID = 1098215578440
at org.jboss.ejb.plugins.AbstractInstanceCache.insert(AbstractInstanceCache.java:222)
at org.jboss.ejb.plugins.StatefulSessionFilePersistenceManager.createSession(StatefulSessionFilePersistenceManager.java:199)
at org.jboss.ejb.StatefulSessionContainer.createHome(StatefulSessionContainer.java:441)
at sun.reflect.GeneratedMethodAccessor115.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.ejb.StatefulSessionContainer$ContainerInterceptor.invokeHome(StatefulSessionContainer.java:756)
at org.jboss.ejb.plugins.SecurityInterceptor.invokeHome(SecurityInterceptor.java:105)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invokeHome(CachedConnectionInterceptor.java:215)
at org.jboss.ejb.plugins.StatefulSessionInstanceInterceptor.invokeHome(StatefulSessionInstanceInterceptor.java:128)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:111)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:178)
at org.jboss.ejb.plugins.TxInterceptorCMT.invokeHome(TxInterceptorCMT.java:52)
at org.jboss.ejb.plugins.LogInterceptor.invokeHome(LogInterceptor.java:129)
at org.jboss.ejb.StatefulSessionContainer.invokeHome(StatefulSessionContainer.java:368)
at org.jboss.ejb.Container.invoke(Container.java:730)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:517)
at org.jboss.invocation.local.LocalInvoker.invoke(LocalInvoker.java:98)
at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:102)
at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:77)
at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:80)
at org.jboss.proxy.ejb.HomeInterceptor.invoke(HomeInterceptor.java:198)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:76)
at $Proxy59.create(Unknown Source)
at com.canopyint.connect.service.mdb.DestinationDuplicateMDB.processMessage(DestinationDuplicateMDB.java:81)
at com.canopyint.connect.common.MdbBase.onMessage(MdbBase.java:201)
at sun.reflect.GeneratedMethodAccessor113.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.ejb.MessageDrivenContainer$ContainerInterceptor.invoke(MessageDrivenContainer.java:391)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:186)
at org.jboss.ejb.plugins.MessageDrivenInstanceInterceptor.invoke(MessageDrivenInstanceInterceptor.java:88)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:107)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:178)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:60)
at org.jboss.ejb.plugins.RunAsSecurityInterceptor.invoke(RunAsSecurityInterceptor.java:100)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:204)
at org.jboss.ejb.MessageDrivenContainer.invoke(MessageDrivenContainer.java:302)
at org.jboss.ejb.plugins.jms.JMSContainerInvoker.invoke(JMSContainerInvoker.java:962)
at org.jboss.ejb.plugins.jms.JMSContainerInvoker$MessageListenerImpl.onMessage(JMSContainerInvoker.java:1038)
at org.jboss.jms.asf.StdServerSession.onMessage(StdServerSession.java:243)
at org.jboss.mq.SpyMessageConsumer.sessionConsumerProcessMessage(SpyMessageConsumer.java:603)
at org.jboss.mq.SpyMessageConsumer.addMessage(SpyMessageConsumer.java:417)
at org.jboss.mq.SpySession.run(SpySession.java:296)
at org.jboss.jms.asf.StdServerSession.run(StdServerSession.java:178)
at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:642)
at java.lang.Thread.run(Thread.java:536)


My environment is:
jboss-3.0.4_tomcat-4.1.12
j2sdkee1.3.1
j2sdk1.4.1_01
jakarta-struts-1.1-b2

Any ideas?