Re: [rules-users] Human Task - ERROR : JPAKnowledgeService.newStatefulKnowledgeSession ...

Hello all, I get an exception while last line of below method executed : public StatefulKnowledgeSession createSession() throws Exception { /* * Create the knowledgebase using the required bpmn and drl files */ KnowledgeBase kbase = readKnowledgeBase("HumanTask.bpmn"); EntityManagerFactory emf = Persistence.createEntityManagerFactory( "org.jbpm.persistence.jpa" ); Environment env = KnowledgeBaseFactory.newEnvironment(); env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf ); env.set( EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager() ); env.set( EnvironmentName.GLOBALS, new MapGlobalResolver() ); Properties properties = new Properties(); properties.put("drools.processInstanceManagerFactory", "org.jbpm.persistence.processinstance.JPAProcessInstanceManagerFactory"); properties.put("drools.processSignalManagerFactory", "org.jbpm.persistence.processinstance.JPASignalManagerFactory"); KnowledgeSessionConfiguration config = KnowledgeBaseFactory.newKnowledgeSessionConfiguration(properties); return JPAKnowledgeService.newStatefulKnowledgeSession(kbase, config, env); } its stack-trace is : 14:26:13,111 WARN [JtaTransactionManager] Participating in existing JTA transaction, but no JTA TransactionManager or TransactionSychronizationRegistry available: java.lang.NullPointerException at org.drools.persistence.jta.JtaTransactionManager.registerTransactionSynchronization(JtaTransactionManager.java:221) at org.drools.persistence.SingleSessionCommandService.registerRollbackSync(SingleSessionCommandService.java:333) at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:123) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)... Can anyone help me to solve this problem ? Thanks in advance S.M.H.Jamali _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users