[JIRA] Created: (CAY-791) ThreadLocal bound DataContext is not obtainable in a multi-thread for a request environment such as ZK

From: Steve Wells (JIRA) ("Steve)
Date: Mon May 21 2007 - 04:32:43 EDT

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    ThreadLocal bound DataContext is not obtainable in a multi-thread for a request environment such as ZK
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                     Key: CAY-791
                     URL: https://issues.apache.org/cayenne/browse/CAY-791
                 Project: Cayenne
              Issue Type: Bug
              Components: Cayenne Core Library
        Affects Versions: 2.0 [STABLE], 3.0
             Environment: ZK Ajax framework and any other multi-thread per request environment
                Reporter: Steve Wells
             Assigned To: Andrus Adamchik

    Having hit my first roadblock now is getting DataContext, as each ZK request runs in a separate thread (see: http://www.zkoss.org/smalltalks/zkacegi/zkacegi.dsp ) I think this is the problem why I can't get DC with WebApplicationContextFilter and DataContext.getThreadDataContext (). I get "IllegalStateException: Current thread has no bound DataContext."
     
    Looking into src for DataContext I see this comment // TODO: Andrus, 11/7/2005 - should we use InheritableThreadLocal instead?
     
    So I subclassed DataContext and overrode the :
    ThreadLocal threadDataContext
     
    to be
     
    InheritableThreadLocal threadDataContext
     
    changed WebApplicationContextFilter to call my subclassed DataContext and it works.

    HOWEVER! This possible solution may be dangerous and currently needs more investigation. 

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