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When you login-logout-login-logout-... to a collab session, there are various objects left on heap. Main culprit may be IMCollabSession instance. See the attached OptimizeIt screenshot for the reference path of IMCollabSession instance.
Created attachment 24636 [details] OptimizeIt screenshot
Mostly fixed by fixing issue 63910. The only remaining problem (beyond 64357) is a dangling reference from collab explorer's manager (last explored node)
Fixed the last part: collab/ui/src/org/netbeans/modules/collab/ui/CollabExplorerPanel.java,v1.3 Will be fixed in version 1.0.4 of the collab-UI module on autoupdate.