The property `sun.nio.ch.disableSystemWideOverlappingFileLockCheck` has been removed. Consequently, compatibility with the older locking approach has also been removed.

JDK 6 introduced the system property `sun.nio.ch.disableSystemWideOverlappingFileLockCheck` to control file locking behavior. Specifically, the property was used to enable suppression of JVM-wide file locking and provide compatibility with JDK 1.4 and JDK 5. The old behavior was constrained to check for locks obtained only on the channel instance and not JVM-wide, which is what was actually specified.