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Review the cluster member join/leave event handlers to ensure client sessions are being cleaned up properly.
I have updated the plugins page http://www.igniterealtime.org/projects/openfire/plugins.jsp , I am unsure why the hazelcast name and description are not showing.
Update plugin version to 1.2.2; will need to be rebuilt and updated on the Openfire plugins page.
Review the cluster member join/leave event handlers to ensure client sessions are being cleaned up properly.