We are looking at speeding up a project with new developers. How long is a typical Java + OpenGl learning curve if anyone has any experience ? The core work is on detailed globe visualization.
JOGL is a thin wrapper around OpenGL, if you know OpenGL, you can do JOGL.
Java - it's easy if you have OO experience in your team, although learning the APIs will take time, as with all new platforms.
"If anyone has any experience" - what do you mean by that? If you have people who have experience with Java and with OpenGL in another programming language (C or C++ for example), then learning JOGL (the Java OpenGL API that's on its way becoming a standard - JSR-231) is going to be easy, because JOGL is only a thin wrapper around OpenGL - it has the same concepts and same structure as the OpenGL API in C.
If your developers do not have any experience with OpenGL or 3D computer graphics, then it's going to be a lot harder.
I went through some of the tutorials on http://nehe.gamedev.net/ to try JOGL without a C background, and I found it easy enough to understand.