I have a good amount of experience in Java 2D and I like using it to make games. But the documentation for Swing and AWT are not oriented toward game creation, and it is often hard to find the best way to do a simple task like find a good timer, implement a game loop, or use double buffering (or triple buffering). I have Killer Game Programming in Java, and it is an excellent resource, but I am still not satisfied with any official documentation. I don't really want to learn any other libraries, since I prefer to make my own engines/frameworks/whatever from scratch, but it seems that the best solution for me to have a game-oriented and highly functional base library is to learn LWJGL.
However, I am not interested (for now) in anything 3D. Is LWJGL too complex to learn just for 2D applications? How much work does it take to lay the foundation of a game in LWJGL vs. regular old Java? Should I just stick with the comfortable, familiar, Java 2D?
If making the leap to LWJGL is worth the effort (and at some point it has to be), I believe I would have to learn quite a bit about openGL and low-level rendering in general, but I love to learn stuff like that as long as the information is presented in an accessible and orderly fashion. What are the best resources for me to learn to use it? I prefer books if they exist, but online tutorials can be useful as well.