1995  
  Alpha and Beta releases (unstable)
   
1996-01-23  
  Java 1.0 [JDK 1.0]
   
1997-02-19  
  Java 1.1 [JDK 1.1]
  inner classes
libs: AWT event; JDBC, RMI; reflection
   
1998-12-08  
  Java 1.2 [J2SE 1.2] Playground
  strictfp
libs: unified collections; Swing; Event Listeners; Thread synchronizations changed
   
2000-05-08  
  Java 1.3 [J2SE 1.3] Kestrel
  platform: HotSpot JVM
   
2002-02-06  
  Java 1.4 [J2SE 1.3] Merlin
  assert
  chained exception
libs: regular expressions; NIO; integrated XML
   
2004-09-30  
  Java 5 (1.5) [J2SE 5.0] Tiger
  generics
  annotations
  enum types
  varags echanced for loops
  static import
  autoboxing/unboxing (primitive/wrapper types)
  enhanced for (collections)
  covariant return types
libs: concurrency utilities
   
2006-12-11  
  Java 6 (1.6) [Java SE 6] Mustang
  @override
  pluggable annotations
libs: JDBC 4.0
  VM scripting language support
  Updates 1-81
   
2011-07-28  
  Java 7 (1.7) [Java SE 7] Dolphin
  switch on Strings
  try with resources
  diamond operator <>
  type inference for generic instance creation
  multiple exception handling
  automatic null handling
libs: NIO.2
  VM: dynamic languages support
  Updates 1-72
   
2014-03-18  
  Java 8 (1.8) [Java SE 8]
  lambda expressions
  annotations on Java types
  default methods
  type annotations
  static methods in interfaces
  functional interfaces
  generic type inference improvements
libs: improved Date Time API java.time; java.util.function; java.util.stream
  Updates 5-25
   
2016-xx-xx  
  Java 9 (1.9) [Java SE 10]

The Java Programming Language book editions:

1996 1st edition TJPL Java 1
1997 2nd edition TJPL2 Java 1.1
2000 3rd edition TJPL3 J2SE 1.3
2005 4th edition TJPL4 J2SE 5.0

The Java Language Specification editions:

2014-03 Java SE 8 Edition  
2011-07 Java SE 7 Edition  
2005-05 Third Edition (Java SE 5.0 release)
2000-06 Second Edition (Java 2 release)
1996-08 First Edition  

Java Ecosystem

Java SE - Java Platform, Standard Edition

1998 J2SE 1.2
2000 J2SE 1.3
2002 J2SE 1.4
2005 J2SE 1.5
2006 Java SE 6
2011 Java SE 7
2014 Java SE 8

Java EE - Java Platform, Enterprise Edition

1999 J2EE 1.2
2001 J2EE 1.3
2003 J2EE 1.4
2005 Java EE 5
2009 Java EE 6
2013 Java EE 7

JVM: Java Virtual Machine

Standards / APIs:

CDI Contexts and Dependency Injection (for Java EE)
EJB Enterprise Java Beans - server side component architecture (Java EE)
Java Servlet  
JSP JavaServer Pages
JPA Java Persistence API
JSF JavaServer Faces (component-based user interfaces) [v1: JSP views; v2: Facelets]
JMS Java Message Service
JDBC Java Database Connectivity
JTA Java Transaction API
JNI Java Native Interface

Graphics / UI

1995  
  AWT Abstract Window Toolkit
  original UI widget toolkit; part of JFC
1996  
  IFC Netscape Internet Foundation Classes
1997  
  Swing GUI widget toolkit - MVC (from IFC)
1997  
  JFC Java Foundation Classes
  Graphical framework for GUIs (AWT, Swing, Java 2D)
2001  
  SWT Standard Widget Toolkit
  used in Eclipse IDE (native system use through JNI)
2004  
  JFace UI Toolkit (Eclipse)