Hi everybody! I'm using jBPM 5.3.0.Final, Drools 5.4.0.Final and JBoss 7.1.1. I'm trying to run jbpm with human task service. When I start processes without human tasks everything works fine. But when I try to run process with human task I get the following exception (see full error log in attachments): Caused by: java.lang.NullPointerException at org.drools.persistence.jta.JtaTransactionManager.getStatus(JtaTransactionManager.java:205) [drools-persistence-jpa-5.4.0.Final.jar:5.4.0.Final] at org.jbpm.task.service.persistence.TaskJTATransactionManager.getStatus(TaskJTATransactionManager.java:63) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final] at org.jbpm.task.service.persistence.TaskJTATransactionManager.begin(TaskJTATransactionManager.java:36) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final] at org.jbpm.task.service.persistence.TaskPersistenceManager.beginTransaction(TaskPersistenceManager.java:79) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final] at org.jbpm.task.service.TaskServiceSession.doOperationInTransaction(TaskServiceSession.java:976) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final] ... 28 more I init HumanTaskService and jBPM in following way: Environment JBPM_ENVIRONMENT = KnowledgeBaseFactory.newEnvironment(); JBPM_ENVIRONMENT.set(EnvironmentName.ENTITY_MANAGER_FACTORY, Persistence.createEntityManagerFactory("org.jbpm.persistence.jpa")); JBPM_ENVIRONMENT.set(EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager()); JBPM_ENVIRONMENT.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 JBPM_CONFIG = KnowledgeBaseFactory.newKnowledgeSessionConfiguration(properties); EntityManagerFactory emf = Persistence.createEntityManagerFactory("org.jbpm.task"); TaskService taskService = new TaskService(emf, SystemEventListenerFactory.getSystemEventListener()); MinaTaskServer taskServer = new MinaTaskServer(taskService); // start the server Thread thread = new Thread(taskServer); thread.start(); TaskClient taskClient = new TaskClient(new MinaTaskClientConnector("myHtsClient", new MinaTaskClientHandler(SystemEventListenerFactory.getSystemEventListener()))); if (!taskClient.connect(TASK_CLIENT_SERVER_ADDRESS, TASK_CLIENT_SERVER_PORT)) { logger.error("Could not connect task client"); } StatefulKnowledgeSession session = JPAKnowledgeService.newStatefulKnowledgeSession(readKnowledgeBase(), JBPM_CONFIG, JBPM_ENVIRONMENT); session.getWorkItemManager().registerWorkItemHandler("Human Task", new MinaHTWorkItemHandler(session)); I had an experiment: before a process start and after it I looked up the UserTransaction: try { logger.info("found: " + new InitialContext().lookup("java:comp/UserTransaction")); } catch (NamingException e) { logger.info("not found", e); } // start process code try { logger.info("found: " + new InitialContext().lookup("java:comp/UserTransaction")); } catch (NamingException ex) { logger.info("not found", ex); } The name java:comp/UserTransaction I took from org.drools.persistence.jta.JtaTransactionManager which falls with NPE. It still falls and in my log: found: org.jboss.tm.usertx.client.ServerVMClientUserTransaction@1033fb5 com.example.my.jbpm.rest.ProcessManagementResources http--127.0.0.1-8080-2 No UserTransaction found at JNDI location [java:comp/UserTransaction] org.drools.persistence.jta.JtaTransactionManager NioProcessor-2 found: org.jboss.tm.usertx.client.ServerVMClientUserTransaction@1033fb5 com.example.my.jbpm.rest.ProcessManagementResources http--127.0.0.1-8080-2 -- View this message in context: http://drools.46999.n3.nabble.com/JtaTransactionManager-couldn-t-find-Use... Sent from the Drools: User forum mailing list archive at Nabble.com.