[jboss-dev-forums] [jBPM Development] - IllegalStateException Using StatefulKnowledgeSession

[irshad mansuri]

irshad mansuri [https://community.jboss.org/people/irs] created the discussion

"IllegalStateException Using StatefulKnowledgeSession"

To view the discussion, visit: https://community.jboss.org/message/803811#803811

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Hi i have created a workflow using humantask with database. But when i am deploying the process i am getting this error "*java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException".*
I debugged the java code and found the its not able to create "*StatefulKnowledgeSession". * This is the code which i am implementing.

*
*
@Test
     public void processInstancePersistentTest() throws Exception{

        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add(new ClassPathResource("HumanWorkflow.bpmn"), ResourceType.BPMN2);

        System.out.println("=== Knowledge Base Called ====");

        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());

        Environment env = EnvironmentFactory.newEnvironment();
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("org.jbpm.task");        
        env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);        
        env.set(EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager());

        System.out.println("=== Stateful Knowledge Session Called ====");

        final StatefulKnowledgeSession ksession = JPAKnowledgeService.newStatefulKnowledgeSession(kbase, null, env);
        int sessionId = ksession.getId();

        assertNotNull(sessionId);
        assertTrue(sessionId != 0);

        System.out.println("=== Human Task Handler Called ====");
        @SuppressWarnings("deprecation")
        CommandBasedWSHumanTaskHandler taskHandler = new CommandBasedWSHumanTaskHandler(ksession);
        ksession.getWorkItemManager().registerWorkItemHandler("Human Task",    taskHandler);


         ProcessInstance processInstance = ksession.createProcessInstance("com.sample.hello", null);
         System.out.println(">>> Let's Start the Process Instance");
         long processInstanceOne = processInstance.getId();
         ksession.startProcessInstance(processInstanceOne);
         ksession.dispose();

    }   


and this is the error which i am getting on debugging the code.


    java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException
    at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:142)
    at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:66)
    at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:122)
    at com.sample.HelloProcesTest.processInstancePersistentTest(HelloProcesTest.java:58)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
    at org.jbpm.test.KnowledgeSessionCleanup$1.evaluate(KnowledgeSessionCleanup.java:28)
    at org.junit.rules.TestWatchman$1.evaluate(TestWatchman.java:48)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:128)
    ... 29 more
Caused by: java.lang.NullPointerException
    at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:168)
    ... 34 more

Let me know if i am missing out something.

Thanks
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