OpenJDK 6 or 7 PowerPC build on OS X Leopard

[MiB]

Is anyone working on this currently? I have a Dual 2.0 G5 with OS X  
10.5.8 and VM build 1.5.0_30-161. What can I do to advance the status?  
Are there any current preparations described on how to get started?  
Binaries I can help test?

M;y personal objective is to be able to run Spring Roo 1.2RC1+ on PPC  
under jdk 1.6 or 1.7.

The binary builds of openjdk 7 available all seem to not work at all  
with Spring Roo.
/MiB