Hello, I've got two EARs: one SEAM Project using jBPM and a second EJB Project (lets call it JBPMContextProvider) which should be able to connect to the database (Hypersonic) where all the task information of JBPM is stored. My problem is, when I retrieve a TaskInstance-Object in JBPMContextProvider from the database, I get a ClassCastException. The setup: - each of the EARs has a reference of the jbpm-jpdl.jar - the SEAM Project binds the SessionFactory to java:/projectSessionFactory - JBPMContextProvider makes an JNDI lookup to retrieve a SessionFactory object - to select the TaskInstances from the database, I use a named query set up in the original JBPM hibernate.cfg.xml-file and try to iterate through the result set - there the ClassCastException happens: | InitialContext ctx; | ctx = new InitialContext(); | SessionFactory sessionFactory = (SessionFactory) ctx.lookup(JNDI); | sessionFactory.openSession(); | | Session session = sessionFactory.getCurrentSession(); | Transaction tx = session.beginTransaction(); //works fine | | Query query2 = session.getNamedQuery("TaskMgmtSession.findTaskInstancesByActorId"); | query2.setString("actorId", actorId); | result = query2.list(); | | for (Iterator iter = result.iterator(); iter.hasNext();) { | TaskInstance ti = (TaskInstance) iter.next(); //CastException | System.out.println("*** ActorId is: "+ti.getActorId()+" ***"); | } | ErrorTrace: | 18:31:42,132 ERROR [STDERR] java.lang.ClassCastException: org.jbpm.taskmgmt.exe.TaskInstance | 18:31:42,132 ERROR [STDERR] at org.project.context.ContextProviderBean.getUserHistory(ContextProviderBean.java:71) | 18:31:42,132 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) | 18:31:42,132 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) | 18:31:42,132 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) | 18:31:42,132 ERROR [STDERR] at java.lang.reflect.Method.invoke(Unknown Source) | 18:31:42,132 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112) | 18:31:42,132 ERROR [STDERR] at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166) | 18:31:42,132 ERROR [STDERR] at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63) | 18:31:42,132 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | 18:31:42,132 ERROR [STDERR] at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54) | 18:31:42,132 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | 18:31:42,132 ERROR [STDERR] at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47) | 18:31:42,132 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | 18:31:42,132 ERROR [STDERR] at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:126) | 18:31:42,132 ERROR [STDERR] at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:195) | 18:31:42,132 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | 18:31:42,132 ERROR [STDERR] at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:95) | 18:31:42,132 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | 18:31:42,132 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62) | 18:31:42,132 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | 18:31:42,132 ERROR [STDERR] at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77) | 18:31:42,132 ERROR [STDERR] at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:110) | 18:31:42,132 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | 18:31:42,132 ERROR [STDERR] at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46) | 18:31:42,132 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | 18:31:42,132 ERROR [STDERR] at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106) | 18:31:42,132 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | 18:31:42,132 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:304) | 18:31:42,132 ERROR [STDERR] at org.jboss.ejb3.remoting.IsLocalInterceptor.invokeLocal(IsLocalInterceptor.java:81) | 18:31:42,132 ERROR [STDERR] at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:72) | 18:31:42,132 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | 18:31:42,132 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:107) | 18:31:42,132 ERROR [STDERR] at $Proxy63.getUserHistory(Unknown Source) | This brought me already to the idea to compare the ClassLoaders which might be a reason, but I don't know how to solve. | System.out.println(result.get(0).getClass().toString()); | System.out.println(result.get(0).getClass().getClassLoader().toString()); | System.out.println(new TaskInstance().getClass().getClassLoader().toString()); | System.out.println(result.get(0).getClass().getClassLoader().equals(new TaskInstance().getClass().getClassLoader())); | This code delivers to STDOUT: | org.jboss.mx.loading.UnifiedClassLoader3@79b43f{ url=file:/C:/jboss-4.2.2.GA/server/default/tmp/deploy/tmp26274seam_project.ear ,addedOrder=45} | org.jboss.mx.loading.UnifiedClassLoader3@3b5587{ url=file:/C:/jboss-4.2.2.GA/server/default/tmp/deploy/tmp26273JBPMContextProviderEAR.ear ,addedOrder=44} | false | Thanks for any hints! 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