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Message: [QUOTE="Mark Space, post: 3438086"] Maybe I missed something, but why not just set bigData to null when you are done? If all you need is theFeatureValue, after you calculate it, just empty out the LinkedList. public MyClass { int someID; List<ManyOfThem> bigData; public void removeAll() { bigData = null; } } That leaves you with a MyClass for the reference in MyFeature, and the int someID still set. The List will be garbage collected when the JVM is ready. If it makes difference in user experience, you can ask that the gc clean up objects with a call to System.gc(); Or maybe Lew already said that and I just missed it. [/QUOTE]