2 Replies Latest reply on Jan 14, 2013 10:37 AM by nsharm28

    Couldn't retrieve the node name for the process instance in JBPM 5.4

    nsharm28
    nsharm28 Jan 10, 2013 12:40 AM

      Hi,

       

      When i am trying  to retreive the node name for particular process instance. I am getting following Error.

       

              at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)

      Caused by: java.lang.NullPointerException

              at org.jbpm.process.instance.impl.ProcessInstanceImpl.getProcess(ProcessInstanceImpl.java:68)

              at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.getWorkflowProcess(WorkflowProcessInstanceImpl.java:181)

              at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.getNodeContainer(WorkflowProcessInstanceImpl.java:69)

              at org.jbpm.workflow.instance.impl.NodeInstanceImpl.getNode(NodeInstanceImpl.java:103)

              at org.jbpm.workflow.instance.impl.NodeInstanceImpl.getNodeName(NodeInstanceImpl.java:79)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

        at java.lang.reflect.Method.invoke(Method.java:597)

        at org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:173)

        at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:89)

        at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:167)

        at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:94)

        at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:58)

        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)

        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)

        at java.util.concurrent.FutureTask.run(FutureTask.java:139)

        at org.apache.cxf.workqueue.SynchronousExecutor.execute(SynchronousExecutor.java:38)

        at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:106)

        at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:263)

        at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:123)

        at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:207)

        at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:213)

        at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:154)

        at org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:126)

        at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:186)

        at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:109)

        at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

        at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:164)

        at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)

        at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)

        at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)

        at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:176)

       

      below is the LOC, to get nodename

      System.out.println(("Node name "+((org.jbpm.workflow.instance.WorkflowProcessInstance)instance).getNodeInstances().iterator().next().getNodeName()));

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        • 1. Re: Couldn't retrieve the node name for the process instance in JBPM 5.4
          swiderski.maciej
          swiderski.maciej Jan 10, 2013 5:47 AM (in response to nsharm28)

          if you use persistence you should make it as part of transaction and to do so you could use command like following:

          String nodeName = ksession.execute(new GenericCommand<String>() {
    public String execute(Context context) {
        StatefulKnowledgeSession ksession = ((KnowledgeCommandContext) context).getStatefulKnowledgesession();
        org.jbpm.process.instance.ProcessInstance processInstance = (org.jbpm.process.instance.ProcessInstance) ksession.getProcessInstance(piId);
        
        return ((org.jbpm.workflow.instance.WorkflowProcessInstance)instance).getNodeInstances().iterator().next().getNodeName());
    }
});

          Obviously it's simple case you could have a command that does all you need.

           

          if you are looking for a way to get node names of active process instance you can use history log data for it and then you don't need to have anything else but processInstanceId, take a look at methods of this class

           

          HTH

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          • 2. Re: Couldn't retrieve the node name for the process instance in JBPM 5.4
            nsharm28
            nsharm28 Jan 14, 2013 10:37 AM (in response to swiderski.maciej)

            Thanks alot Maciej

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