Richard Evans [https://community.jboss.org/people/r3vans] created the discussion "Multiple Threads on a Stateful Session" To view the discussion, visit: https://community.jboss.org/message/744840#744840 -------------------------------------------------------------- I am trying to get an multi-threaded application to run against a single kSession. I have made every serviceTask asynchronous but I CANNOT eliminate problems that I think are related to persistence context. Each Handler lools like this:    executeWorkItem(WorkItem workItem, WorkItemManager manager ) {        WorkHandlerRunner task = new WorkHanderRunner ( kSession, workItem, this)        threadPoolTaskExecutor.execute ( task )    } WorkHandlerRunner run looks like this   Constructor saves kSesssion, workItem and workItemHandler    run() {        WorkItemManager manager = kSession.getWorkItemManager()        results = runInTransaction ( manager )        manager.completeWorkItem ( workItem.getId(), results)     }    @Transactional     Map<String, Object> runInTransaction ( WorkItemManager manager) {             // the doExecute does the business work and does not call into kbpm code             return handler.doExecuteWorkItem (workItem, manager)      } When run it sometimes works for a while but eventually falls over with a mixture of exceptions like - JPAWorkItemManager.internalWorkItem ( JPAWorkItemManager.java 43 )  - NPA - ProcessInstanceImp.getProcess ( kruntime null ) I am trying to get a better handle on what happens and when but wonder whether at this light level of reporting someone can spot the obvious mistake. Cheers, Richard -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/744840#744840] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]