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Message: [QUOTE="markspace, post: 4025621"] If the HashMap becomes unreachable, it will be garbage collected. A HashMap only "leaks" when you have a reference to the HashMap you want to keep, and you want to remove a reference inside the hash map. In fact, I believe this problem only really occurs when you have a WeakHashMap, which can accidentally hold on to it's own references. If you are using a local variable, then you are fine. The hash map will be eligible for garbage collection as soon as the local variable goes out of scope. [/QUOTE]