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Sometimes a request works with correct response, but the other times the same request doesnt get processed and throws Internal Server Error.
Are the requests getting lost sometimes? As I see something like this in Logs:
2012-10-09 21:53:14,930 INFO [DoTxRunnable]
-- running do all async transactions
2012-10-09 21:53:14,935 INFO [CompleteProcessRunnable]
-- running do all complete process
2012-10-09 21:53:14,936 INFO [TerminateRunnable]
-- running do all terminate
2012-10-09 21:53:51,301 INFO [NotifyRequestorRunnable]
-- running do all notify requestor fire and forget
2012-10-09 21:53:51,385 INFO [NotifyRequestorRunnable]
-- running do all notify requestor idle timeout