[Opensymphony-oscache] Error in mass concurrence!

Following is my wrapping code:

[code]
 // synchronized (this) {      //Uncomment this line ,when 1000 threads geting/removing/putting you will by chance see ERROR :java.lang.IllegalStateException: Cannot cancel cache update - current state (-1) is not UPDATE_IN_PROGRESS
            try {
                obj = cache.getFromCache(k);
                if (obj != null) {
                    found = true;
                }
            } catch (NeedsRefreshException e) {             
                cache.cancelUpdate(k);
            } catch (Exception e) {
                e.printStackTrace();
            }
      //}[/code]

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