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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