Java 9

Java 9 was releaseed 2017-09-21. It is not an LTS release and was obsoleted at the release of Java 10 on 2018-03-20.

Resources

• JDK 9.0.4 General-Availability Release

• Java Platform, Standard Edition What’s New in Oracle JDK 9

• Java Platform, Standard Edition Oracle JDK 9 Migration Guide

• WTF, Java 9?!

Significant Changes from Java 8

• JEP 200: Introduced the modular JDK.

• JEP 243: Java-Level JVM Compiler Interface

  • First prototyped in Java 8, this is the foundation for things like Graal: language compilers written in Java that target the JVM at runtime. It's an experimental feature in Java 9, and the actual API is changed in Java 11.

• Removed javac support for --source/--target 5/1.5.

• Static convenience factory methods for collections, with new immutable implementations.