J J [http://community.jboss.org/people/joshjdevl] created the discussion "jbpm hibernate persistence" To view the discussion, visit: http://community.jboss.org/message/593144#593144 -------------------------------------------------------------- Hi, We are using Hibernate as our persistence implementatio and Bitronix. I would like to configure JBPM peristence to use a hibernate entity manager so it can participate in our application transactions and go to our existing databases. I've done something like this where I inject our jtaTransactionManager.         // create the entity manager factory and register it in the environment         final EntityManagerFactory emf = new EntityManagerFactoryImpl(                 getSessionFactory(), PersistenceUnitTransactionType.JTA, true, null);         final Environment env = KnowledgeBaseFactory.newEnvironment();         env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);         // env.set(EnvironmentName.PERSISTENCE_CONTEXT_MANAGER, emf);         env.set(EnvironmentName.TRANSACTION_MANAGER, jtaTransactionManager);         // create a new knowledge session that uses JPA to store the runtime         // state         final StatefulKnowledgeSession ksession =                 JPAKnowledgeService.newStatefulKnowledgeSession(getKnowledgeBase(), null, env); However, I receive the following error. Any clues/hints? Caused by: java.lang.reflect.InvocationTargetException           at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)           at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)           at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)           at java.lang.reflect.Constructor.newInstance(Constructor.java:532)           at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:116)           ... 34 more Caused by: java.lang.RuntimeException: Could not commit session           at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:136)           ... 39 more Caused by: java.lang.NullPointerException           at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:125)           ... 39 more -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/593144#593144] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]