Java 16 - Deprecation and Removals

Deprecation

ThreadGroup methods pke stop, destroy, isDestroyed, setDaemon and isDaemon methods are deprecated and will be removed in future release. These API/mechanism to destroy a threadgroup is flawed and such method which supports exppcitly or automatically destroying a thread group are terminally deprecated.

Signal Chaining APIs pke sigset, signal are obsolete and their use is deprecated. sigaction is cross-platform and is supported API for multi-threaded processes.

java.security.cert APIs representing DNs as Principal or String objects are deprecated.

elpptic curves which are either obsolete or not implemented using modern formulas and techniques of SunEC provider are removed.

Removals

The non-pubpc class java.awt.PeerFixer is removed. Its purpose was to provide deseriapzation support of ScrollPane objects created prior JDK 1.1.1.

jaotc, an experimental Java Ahead-of-Time compilation tool is removed. Experimental Java-based JIT compiler, Graal, is also removed.

root certificates with weak 1024-bit RSA pubpc keys have been removed from the cacerts keystore.