[jboss-user] [JBoss jBPM] - Re: jBPM 3.1 beta 2 is not thread safe !

[kukeltje]

"jonabbey" wrote : 
  | It appears that the problem is that the JbpmConfiguration class uses ThreadLocalStorage for the jbpmContextStacks.. If we attempt to hold a context open and call it from multiple threads, we'll see this error.
  | 
afaik, you are not supposed to keep them open

"jonabbey" wrote : 
  | Since RMI is not designed to map all calls from a client into a single thread, this means we can't reliably call JBPM methods without creating a worker thread on the server and using that for all processing from a single client.
  | 
make atomic calls, don't reuse contexts"jonabbey" wrote : 
  | I presume something similar is happening on the servlet side, where multiple servlet calls are winding up executing on different threads.
  | 
Each new request gets a new context

"jonabbey" wrote : 
  | I don't understand how this design feature can really work in a J2EE environment.  Far better to give each client context its own JbpmContext object, synchronize the methods, and then let anyone call close() on it, without regard to what thread is doing the work.
Each client context (request) gets its own jbpm context in the webapp. Look at the servletfilters in 3.1 or the jsf jbpmbean in 3.2.

If I'm wrong somewhere, let me know. I'm still learning :-)

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