NPE in PooledConnction event notification handling if a null listener is added
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                 Key: DERBY-3307
                 URL: https://issues.apache.org/jira/browse/DERBY-3307
             Project: Derby
          Issue Type: Bug
          Components: JDBC
    Affects Versions: 10.3.2.1, 10.4.0.0
            Reporter: Kristian Waagan
            Priority: Minor


If a null reference is passed in to one of the 
ClientPooledConnection.addXEventListener, a NPE will be thrown if an event 
occurs.
I will attach a simple repro as a patch to the test jdbc4.StatementEventsTests. 
I believe the situation is the same for connection event listeners.

I have found no information in the specs regarding null listeners, but I assume 
it would be okay to ignore them.

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