Summary
-------

Remove the compatibility knob introduced by CCC-6332756 in JDK 6 to configure the FileChannel/FileLock API to support JDK 1.4/5 behavior for cases where different FileChannels in the same VM attempt to lock an overlapping region of a file.

Problem
-------

Prior to JDK 6 when a file lock was requested the check of whether the requested lock overlaps an existing file lock was performed only with respect to the locks obtained on the channel. According to the specification however the check should be JVM-wide, against all channels open on the channel's file across the entire JVM. Checking of locks JVM-wide was added as the default behavior in Java 6 along with a system property to enable the old behavior if so desired. This old behavior is now long obsolete and support for it should be removed.

Solution
--------

Remove support for the system property sun.nio.ch.disableSystemWideOverlappingFileLockCheck.

Specification
-------------

There is no specification change per se, but the removal of the sun.nio.ch.disableSystemWideOverlappingFileLockCheck property will be documented in a release note.