During the JVM Language Summit this week, Java architect Mark Reinhold presented 'The Secret History and Tragic Fate of sun.misc.Unsafe' session. The API is a low level library designed strictly for use within the JDK. Mark laid out the plan for the safe replacement of the library over time. It will still be available in Java 9.
In a second session, Paul Sandoz explains potential replacements for some usage of sun.misc.Unsafe. His presentation is 'Safety First' mentioned below