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The CookiesChangeListener has the "nodes" variable which strongly references Nodes. The array is updated from time to time. It contains for instance a refernce to a JavaNode, which in turn references a JavaDataObject. If you, however, delete the JavaDataObject, it is not gced from memory because there is the reference from the nodes array.
Fixed in main trunk. CookieAction$CookiesChangeListener holds nodes as List of WeakReferences instead of array of strong references.
rev 1.16
Resolved for 3.4.x or earlier, no new info since then -> closing.