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Bug - Hazelcast plugin (OF 4.2.1) Null Pointer Exception in ClusterListener.cleanupNode

There is a bug in the Hazelcast plugin (OF 4.2.1) which causes a null pointer exception, when ClusterListener’s cleanupNode is called. The problem seems to happen if a hazelcast node in the cluster is getting shutdown / goes offline, but there are no sessions connected to it. The code makes the assumption that whatever nodeRoutes.get(…) returned is non-null, but that isn’t the case when there were no sessions associated with the node.

See ClusterListener.java, cleanupNode, Line 282 and Line 282.
Please create a JIRA if appropriate. I may have some free time to try and fix this one.

https://issues.igniterealtime.org/browse/OF-1467

Pull request submitted for OF-1467