Based on my own experience these are good points of entry:
http://lwjgl.org/ Best OpenGL wrapper for Java (I should probarbly not call it the best, since there are a lot of different opinions on this topic, but it is the most used wrapper for comercial use).
http://nehe.gamedev.net/ OpenGL Most of their guides have LWJGL code as well. Otherwise OpenGL is OpenGL regardless of Java or not.
http://www.cokeandcode.com/ A great blog! also the home of the Slick library
Also remember that c++ is not the necessarily the next step. It is some thing that is good to learn at some point, but you can make great games with Java, without knowing any c++.

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