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

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 -------------------------------------------------------------- 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. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/617073#617073] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]