concurrency issue / race condition in current wicket (will sometimes fail under 
stress)
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                 Key: WICKET-1693
                 URL: https://issues.apache.org/jira/browse/WICKET-1693
             Project: Wicket
          Issue Type: Bug
          Components: wicket
         Environment: jetty 6.1.9, mac os x 10.5.3, jdk 1.5, wicket 1.4.x trunk 
(#665751)
            Reporter: Peter Ertl
            Priority: Critical


In current wicket there seems to be a concurrency issue / race condition.

I did some stress test with JMeter on my very simple wicket app with a very 
simple stateful page (mostly to determine render performance of wicket in 
pages/sec). The test was done with approximately 200-500 concurrent threads.

After running for a few seconds NullPointerExceptions were appearing in the 
console log.

I uploaded the log which contains quite a few stacktraces.

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