Hi! I get InvocationTargetException after the following: return constructor.newInstance( kbase, conf, env ); in KnowledgeStoreServiceImpl. I see that in return (T) constructorAccessor.newInstance(initargs) of Constructor class it throws the InvocationTargetException. The exception is null so I can't see what it the problem! I call the code from this: EntityManagerFactory emf = Persistence.createEntityManagerFactory("org.drools.persistence.jpa"); Environment env = KnowledgeBaseFactory.newEnvironment(); env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf); env.set(EnvironmentName.GLOBALS, new MapGlobalResolver()); env.set(EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager()); ksession = JPAKnowledgeService.newStatefulKnowledgeSession(kbase, null, env); I define the transaction manager in my spring beans like this: username username myurl oracle.jdbc.OracleDriver I see that bitronix is up via the debugging messages. (2011-03-16 12:14:53,399 DEBUG ( PoolingDataSource.java:84) - building XA pool for java/DS1 with 0 connection(s) etc..) in persistence.xml I have: org.hibernate.ejb.HibernatePersistence java/DS1 persistenceorm.xml org.drools.persistence.info.SessionInfo org.jbpm.persistence.processinstance.ProcessInstanceInfo org.drools.persistence.info.WorkItemInfo true What could cause the problem? When I defined the btm with tomcat and not with spring - it worked fine. (but I had context reloading problems). when I define it only with spring - it get this weird exception. -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/InvocationTargetExcep... Sent from the Drools - User mailing list archive at Nabble.com.