[jboss-user] [JBoss jBPM] - Problem accessing CommandServiceBean from external client

[karstendausb]

Hello,

I am encountering problems accessing jbpm 3.2.1. on jboss, and I don't understand what is going wrong.

I am using the following sample code:


  | Properties props = new Properties();
  | props.setProperty(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
  | props.setProperty(Context.URL_PKG_PREFIXES, "org.jboss.naming.client");
  | props.setProperty(Context.PROVIDER_URL, "jnp://localhost:1099");
  | props.setProperty("j2ee.clientName", "jboss-client-test"); 
  | 
  | InitialContext initialContext = new InitialContext(props);
  | Object homeref = initialContext.lookup("ejb/CommandServiceBean");
  | 	     
  | RemoteCommandServiceHome remoteCommandServiceHome = (RemoteCommandServiceHome) avax.rmi.PortableRemoteObject.narrow(homeref, RemoteCommandServiceHome.class);
  | 		  
  | RemoteCommandService remoteCommandService= remoteCommandServiceHome.create();
  | 

Trying the sample command 

  | VariablesCommand vc=new VariablesCommand();
  | Object result=remoteCommandService.execute(vc);
  | 
seems to work well, at least the server logs


  | ==> jboss-4.0.4.GA/server/default/log/server.log <==
  | 2007-08-11 22:03:39,389 DEBUG [org.jbpm.ejb.impl.CommandServiceBean] handing over the command execution to the command service
  | 2007-08-11 22:03:39,390 DEBUG [org.jbpm.configuration.JbpmContextInfo] creating jbpm context with service factories '[tx, message, scheduler, logging, persistence, authentication]'
  | 2007-08-11 22:03:39,390 DEBUG [org.jbpm.JbpmContext] creating org.jbpm.JbpmContext at 135df99
  | 2007-08-11 22:03:39,390 DEBUG [org.jbpm.ejb.impl.CommandServiceBean] executing org.jbpm.command.VariablesCommand at 1eaf3fa
  | 2007-08-11 22:03:39,390 DEBUG [org.jbpm.JbpmContext] closing JbpmContext
  | 

But when I try to use any other Command which utilizes AbstractGetObjectBaseCommand  , like GetProcessDefinitionsCommand for example:

  | GetProcessDefinitionsCommand vc=new GetProcessDefinitionsCommand();
  | Object result=remoteCommandService.execute(vc);
  | 

an exception is thrown which includes the following segment:


  | Caused by: java.io.InvalidClassException: org.jbpm.command.AbstractGetObjectBaseCommand; local class incompatible: stream classdesc serialVersionUID = 4676683671013111655, local class serialVersionUID = -7037309091658557544
  | 

The full stacktrace is shown below  (nothing in the logs on server side).
I doublechecked that both (client and server) use the same jbpm-jpdl-version (3.2.1). The server is a Jboss 4.0.4 GA with an unmodified jbpm-ear. 

Anybody seen this behaviour before? I am not an ejb nor an rmi expert, so I don't understand where the problem is.  There are many entries in the forum concerning classcastexceptions, but this topic does not seem to be covered?

Thanks in advance,

Karsten

Here is the full stacktrace:

  | java.rmi.MarshalException: MarshalException; nested exception is: 
  | 	org.jboss.invocation.JBossLazyUnmarshallingException: getArguments failed
  | 	at org.jboss.ejb.Container.invoke(Container.java:1004)
  | 	at sun.reflect.GeneratedMethodAccessor107.invoke(Unknown Source)
  | 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  | 	at java.lang.reflect.Method.invoke(Method.java:585)
  | 	at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
  | 	at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
  | 	at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
  | 	at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
  | 	at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
  | 	at org.jboss.invocation.jrmp.server.JRMPInvoker$MBeanServerAction.invoke(JRMPInvoker.java:819)
  | 	at org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:420)
  | 	at sun.reflect.GeneratedMethodAccessor106.invoke(Unknown Source)
  | 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  | 	at java.lang.reflect.Method.invoke(Method.java:585)
  | 	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:294)
  | 	at sun.rmi.transport.Transport$1.run(Transport.java:153)
  | 	at java.security.AccessController.doPrivileged(Native Method)
  | 	at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
  | 	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:466)
  | 	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:707)
  | 	at java.lang.Thread.run(Thread.java:595)
  | Caused by: org.jboss.invocation.JBossLazyUnmarshallingException: getArguments failed
  | 	at org.jboss.invocation.MarshalledInvocation.getArguments(MarshalledInvocation.java:513)
  | 	at org.jboss.ejb.Container.invoke(Container.java:918)
  | 	... 20 more
  | Caused by: java.io.InvalidClassException: org.jbpm.command.AbstractGetObjectBaseCommand; local class incompatible: stream classdesc serialVersionUID = 4676683671013111655, local class serialVersionUID = -7037309091658557544
  | 	at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:546)
  | 	at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1552)
  | 	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1466)
  | 	at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1552)
  | 	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1466)
  | 	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1699)
  | 	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
  | 	at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1634)
  | 	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
  | 	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
  | 	at org.jboss.invocation.MarshalledValue.get(MarshalledValue.java:91)
  | 	at org.jboss.invocation.MarshalledInvocation.getArguments(MarshalledInvocation.java:509)
  | 	... 21 more
  | 


	


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