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 -------------------------------------------------------------- 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 -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/803811#803811] Start a new discussion in jBPM Development at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]