11:53 a.m.
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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