To clear things up:
The Java engine in Intent is completely current but only to the PJava (Personal Java) specification. This is intended for embedded computing devices, not the desktop.
Creating a Java 1.4 port to AmigaOS would be a great but is a large task. It also breaks into two major efforts
1) port the 'JVM' or Java Virtual Machine to run the Java byte codes. Also, if speed is desired a PowerPC Just-In-Time compiler would also have to be done. The PowerPC JIT compiler may already be available, I'm unsure.
2) Port the AWT/Java2D (Abstract Windowing Toolkit). This basically maps Java graphics to the OS graphics. This is _NOT_ a small task.
It is an interesting question though...DE or OS4? You could port it to either, I just wonder how long it's really going to be before we se AmigaDE in the AmigaOS.
Also, forget HW acceleration. Even on Windows the only Java2D features that are HW accelerated are 'rectangle' and 'bit-blit'.
It would be nice to have but it'll require a serious coordinated effort. You're not going to have a lone-coder crank this out in six months.