Books

• Killer Game Programming in Java - Andrew Davison
• Developing Games in Java - David Brackeen

Game Tutorials

• Java 2D Game Tutorials
• JGO Forum Tutorials
• Games4j Wiki Tutorials
• Coke and Code Tutorials
• The Ninja Cave Tutorials
• Metanet Software Physics
• 2D Game Tutorials (by sproingie)

Game Libraries

2D Engines and Libraries

• Slick2D (Hardware Accelerated 2D Games Library)
• PulpCore (2D Games Engine, especially good for Applets)
• LibGDX (2D and 3D OpenGL library, both desktop and Android support, and more)

3D Engines and Libraries

• Ardor3D (Java based 3D engine)
• JMonkeyEngine (Java based 3D engine)
• jPCT (Java based 3D engine)
• LibGDX (2D and 3D OpenGL library, both desktop and Android support, and more)
• Clyde (For creating action-oriented networked 3D games in Java.)
• Xith3D (Java based 3D engine)
• Ogre4J (Java binding to the popular C++ engine <a href="http://www.ogre3d.org/]Ogre3D[/url])
• 3DzzD (Java based 3D engine for webpages)

Graphics and Sound Bindings

• LWJGL (OpenGL, OpenAL, OpenCL, JInput)
• JogAmp (OpenGL, OpenAL, OpenCL)

Sound Libraries

• Paulscode 3D Sound Engine (abstraction layer over JavaSound, OpenAL, etc)

Physics Libraries

• JBox2D (2D physics engine, straight port of the C++ <a href="http://www.box2d.org/]Box2D[/url] engine)
• Fizzy (2D physics engine, based on JBox2D. Presents a more familiar environment to Java programmers)
• JBullet (3D physics engine)

Network Libraries

• KryoNet (clean and simple API for efficient TCP and UDP client/server network communication using NIO)
• RedDwarf (RedDwarf is a server side technology written in Java that radically simplifies the development of online games and lowers the barrier to entry into the MMOG market)
• Narya (The Narya library provides various facilities for making networked multiplayer games.)

GUI Libraries

• TWL (TWL is a GUI library built on top of OpenGL and provides all the standard widgets like labels, edit fields, tables, popups, tooltips, frames and a lot more.)
• Nifty (Nifty GUI is a Library for games or similar applications. The configuration of the GUI are stored in xml files with little supporting Java code.)
• Feng GUI (FengGUI is built on OpenGL and provides all typical GUI components.)
• PureSwing (Reimplementation of Swing)

Java Game Portals

• GameJolt - Upload Java Games and make money
• Games4J - Upload Java Games and make money
• FunOrb - Java Games Portal
• Java4K - The site for the annual Java4k contest, upload &amp; play Java4K games
• Java Game Tome - Showcase your java games online
• Pogo - Online Games Portal
• Chrome Web Store - Google's App Store allows Java Games (You can even sell them)

Featured Misc.

• LibGDX Blog - by badlogic
• TableLayoutc - by Nate