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Message: [QUOTE="Thomas Hawtin, post: 643488"] NIO itself does slightly better than a standard finaliser using sun.misc.Cleaner. (Phantom)References that extend Cleaner get executed from the ReferenceHandler thread, rather than queueing for a reference queue (such as the the finaliser queue). If there is a finaliser that references the buffer then, even with resurrection, the resource will not be cleared until there is no way at all to access it. If NIO can't allocate enough memory from a direct buffer, it will call System.gc to try to get others to finish reclamation. Tom Hawtin [/QUOTE]