[jboss-user] [jBPM] - Re: How to continue process in a web application

[Jo Blithe]

Jo Blithe [http://community.jboss.org/people/johnesky] created the discussion

"Re: How to continue process in a web application"

To view the discussion, visit: http://community.jboss.org/message/617073#617073

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Thanks Demian. I got this error using JPAKnowledgeService.newStatefulKnowledgeSession( kbase, null, env ). What do you think I am doing wrong to get Java null pointer exception:

Exception in thread "main" java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException
          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:130)
          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:54)
          at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:109)
          at com.sample.ProcessTest.main(ProcessTest.java:69)
Caused by: java.lang.reflect.InvocationTargetException
          at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
          at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
          at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
          at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:116)
          ... 3 more
Caused by: java.lang.RuntimeException: Could not commit session or rollback
          at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:133)
          ... 8 more
Caused by: java.lang.RuntimeException: Unable to rollback transaction
          at org.drools.persistence.jta.JtaTransactionManager.rollback(JtaTransactionManager.java:184)
          at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:131)
          ... 8 more
Caused by: java.lang.NullPointerException
          at org.drools.persistence.jta.JtaTransactionManager.rollback(JtaTransactionManager.java:181)
          ... 9 more


Here is part of my code below:

KnowledgeBase kbase = readKnowledgeBase();

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

                      StatefulKnowledgeSession ksession =  JPAKnowledgeService.newStatefulKnowledgeSession( kbase, null, env );

   ksession.startProcess("com.sample.bpmn.hello");

Thanks again for your time.
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