I like the idea, and reusing the swords. For once the logo actually has a sphere in it!

I believe the old, Sun-era Java logo is CDDL licensed, so there wouldn't be issues with that. It's older...but it's also Sun...

You could always use Duke, the Java mascot.  The character is open-source, just like Tux for Linux.

I like the idea, and reusing the swords. For once the logo actually has a sphere in it!

That was the idea. I never understood why the logo had nothing to do with a sphere.

You could always use Duke, the Java mascot.  The character is open-source, just like Tux for Linux.

I had no idea what its name was. Would most people associate that with Java? I've always thought of Java's main logo as being the cup. I mean even the Wikipedia page still has it. If licensing isn't an issue though, I might just go with that.

Sphere has a logo and you may put swords on it if you like:

I made a version that has simulated lighting using gradients, but I don't have access to the vector of it at the moment.

Maybe you could put the swords over a stylized round coffee cup.

The J in the icon with swords should be fatter and more prominent. Maybe even centered, and behind one of the swords? Also the font is too plain, use something more epic (but keep it readable).
I like the colour. Not too screamy, blends in with the soft grays.