I have a simple flow with human task and I want to persist it into database. I'm using MSSQL DB. My code is like this: KnowledgeBase kbase = readKnowledgeBase(); // create the entity manager factory and register it in the environment EntityManagerFactory emf = Persistence.createEntityManagerFactory( "org.drools.persistence.jpa" ); Environment env = KnowledgeBaseFactory.newEnvironment(); env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf ); BitronixTransactionManager btm = TransactionManagerServices.getTransactionManager(); env.set( EnvironmentName.TRANSACTION_MANAGER, btm); StatefulKnowledgeSession ksession = JPAKnowledgeService.newStatefulKnowledgeSession( kbase, null, env ); KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "test"); ksession.getWorkItemManager().registerWorkItemHandler("Human Task", new WSHumanTaskHandler()); // start a new process instance Map<String,Object> data = new HashMap<String,Object>(); data.put("data3", new MyTask(1,"This is taks 1")); ProcessInstance pi = ksession.startProcess("com.sample.ruleflow",data); logger.close(); But when i run it, it end up with this error and there is nothing in the database (the tables were created, but there are all empty): java.lang.NullPointerException at org.drools.persistence.processinstance.ProcessInstanceInfo.getId(ProcessInstanceInfo.java:70) at org.drools.persistence.processinstance.JPAProcessInstanceManager.addProcessInstance(JPAProcessInstanceManager.java:34) at org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1620) at org.drools.process.command.StartProcessCommand.execute(StartProcessCommand.java:46) at org.drools.process.command.StartProcessCommand.execute(StartProcessCommand.java:10) at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:229) at org.drools.process.command.impl.CommandBasedStatefulKnowledgeSession.startProcess(CommandBasedStatefulKnowledgeSession.java:163) at com.sample.RuleFlowPersistenceTest.main(RuleFlowPersistenceTest.java:74) java.lang.RuntimeException: Could not rollback transaction at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:258) at org.drools.process.command.impl.CommandBasedStatefulKnowledgeSession.startProcess(CommandBasedStatefulKnowledgeSession.java:163) at com.sample.RuleFlowPersistenceTest.main(RuleFlowPersistenceTest.java:74) Caused by: java.lang.RuntimeException: Could not execute command at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:255) ... 2 more Caused by: java.lang.NullPointerException at org.drools.persistence.processinstance.ProcessInstanceInfo.getId(ProcessInstanceInfo.java:70) at org.drools.persistence.processinstance.JPAProcessInstanceManager.addProcessInstance(JPAProcessInstanceManager.java:34) at org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1620) at org.drools.process.command.StartProcessCommand.execute(StartProcessCommand.java:46) at org.drools.process.command.StartProcessCommand.execute(StartProcessCommand.java:10) at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:229) ... 2 more In JPAProcessInstanceManager.java there this method is called: public void addProcessInstance(ProcessInstance processInstance) { ProcessInstanceInfo processInstanceInfo = new ProcessInstanceInfo( processInstance ); EntityManager em = (EntityManager) this.workingMemory.getEnvironment().get( EnvironmentName.ENTITY_MANAGER ); em.persist( processInstanceInfo ); ((ProcessInstance) processInstance).setId( processInstanceInfo.getId() ); processInstanceInfo.updateLastReadDate(); internalAddProcessInstance(processInstance); } But em.persist does nothing, no connection do DB is called. And then the next line will fail. Can anybody help me. Thanks Martin Sevcik _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users