Java 9

Release Date: 2017/09/21

Bytecode Version: 53

Documentation: Language Spec, VM Spec, JavaDoc

API Changes: Diff

JVM

Language

Java Modules (Project Jigsaw, JEP 261)
Private methods in interfaces (JEP 213)

Java API

Reactive Streams
Indify String Concatenation (JEP 280)
Var Handles (JEP 193)
Object.finalize() deprecated
Enhanced Deprecation (JEP 277)

Tools

JShell (JEP 222)
jlink (JEP 282)

Complete List: JDK 9