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A DESCRIPTION OF THE REQUEST : I'm not sure if this is against the spec, but it's certainly annoying... The following code snippet returns HashMap$KeySet, which is a subclass of AbstractSet, and thus not Serializable.The parent HashMap object is Serializable though. { Set set = map.keySet(); } JUSTIFICATION : Main use case for this is if one wants to store a keySet in a J2EE HttpSession - I could store the HashMap, so why can't I store it's keySet()? EXPECTED VERSUS ACTUAL BEHAVIOR : EXPECTED - HashMap$KeySet implements Serializable ACTUAL - HashMap$KeySet extends AbstractSet (and doesn't implement Serializable) ---------- BEGIN SOURCE ---------- See above - no other need for code example ---------- END SOURCE ---------- CUSTOMER SUBMITTED WORKAROUND : new HashSet( map.keySet() ); Obviously this isn't a good example for performance / efficiency.
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