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