[JDK-8054494] Remove sun.misc.Unsafe.monitorEnter, monitorExit and tryMonitorEnter - Java Bug System

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Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8082812	emb-9	Paul Sandoz	P4	Resolved	Fixed	team

Analysis of the use of methods sun.misc.Unsafe.monitorEnter, monitorExit and tryMonitorEnter on jars in maven central indicates they are not widely used (mostly just one artifact and that is only required to work around a class loading issue on Java 6).

It is proposed these methods be removed. See the discussion on core-libs:

http://mail.openjdk.java.net/pipermail/core-libs-dev/2014-February/thread.html#25349

Preliminary patches are here:

  http://cr.openjdk.java.net/~psandoz/jdk9/jdk-unsafe-cleanup/webrev/
  http://cr.openjdk.java.net/~psandoz/jdk9/hotspot-unsafe-cleanup/webrev/

Plus another that removes prefetch code that no longer appears to be used:

  http://cr.openjdk.java.net/~psandoz/jdk9/hotspot-unsafe-prefetch-cleanup/webrev/

backported by

JDK-8082812 Remove sun.misc.Unsafe.monitorEnter, monitorExit and tryMonitorEnter

relates to

JDK-8157055 consider unified release notes for deprecated APIs

JDK-8069302 Deprecate Unsafe monitor methods in JDK 8u release

Closed

Paul Sandoz