[jira] [Created] (GEODE-4094) ClientHealthMonitor may cause an NPE in a ServerConnection

["Bruce Schuchardt (JIRA)" <ji...@apache.org>]

Bruce Schuchardt created GEODE-4094:
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             Summary: ClientHealthMonitor may cause an NPE in a ServerConnection
                 Key: GEODE-4094
                 URL: https://issues.apache.org/jira/browse/GEODE-4094
             Project: Geode
          Issue Type: Bug
          Components: client/server
            Reporter: Bruce Schuchardt


When ClientHealthMonitor is shutting down a connection it invokes ServerConnection.handleTermination().  This method eventually sets the connection's clientUserAuths instance variable to null but there are places in ServerConnection that use this variable without a null check.  I was able to write a unit test to cause ServerConnection.doNormalMsg() to throw an NPE 100% of the time by adding appropriate stall points with an observer class and the dunit blackboard.

* send a put from client
* wait for CHM's thread to time out the connection and block it using getBlackboard().waitForGate(*)
* send a second put from client and block just before accessing clientUserAuths
* allow CHM's thread to progress past the point of nulling out the variable
* allow the client's ServerConnection thread to continue - NPE results




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