6429289: (se) sun.nio.ch.SelectorImpl.processDeregisterQueue creates excessive garbage
Summary: Check if the cancelledKeys is empty or not before creating iterator
Reviewed-by: alanb
6541641: (fc) java/nio/channels/FileChannel/ExpandingMap.java should clean up after itself
Summary: Close channel and explicitly de-ref the mapped buffers before exit.
Reviewed-by: alanb