Java

Can't test if this is compatible, but just a heads up that I tried running Minecraft on a 1.67GHz PowerBook G4 waaay back when it was still in alpha (possibly the same Java version you posted). Java absolutely sucked up all the system resources, the fans blasted to full, and the game ran incredibly laggy. I was also on Tiger.

Now I can't say for certain if the performance issues were just due to Java, or possibly poor coding in the early Minecraft builds, though just a gentle warning that any Java apps may not perform as expected.

 

Good luck with that!

http://forums.macrumors.com/threads/java-6-ppc.1586753/
http://forums.macrumors.com/threads/java-6-powerpc.1884036/

The local Minecraft thread: http://forums.macrumors.com/threads/apple-cider-powerpcs-minecraft-solution.1827849/

 

I've spent days and days in a row trying to cobble and compile a working version of Java 6 on PPC. Read every article and guide and blog on the topic I could find.

Never managed to produce anything useful.

If you can actually make progress with this I'd be delighted! But be aware that many have walked that path before, and the solution is further away than it might seem at first.