I don't know anything about the combo AMIGA Java, but for sure I can say Java is a wonderfull language.
And now it is becoming faster, it has hardware acceleration on a lots of platforms, and in the future I bet that processors will have a microcode to exec bytecode directly.
I'm writing games (applets and not) in Java and I'm happy for the result. I've coded in assembly, C/C++ and other languages so I can see the differences.
Java is much simplier, and simplier to debug.