Try java 1.5
They call is 5.0 for some reason
http://java.sun.com/j2se/1.5.0/download.jsp
Yay, it works. Thanks a bunch shochu 
awesome 
I get this same error, I just updated from the CVS build and suddenly 1.4.2_07 doesn’t work (and 1.5 does). Pretty sure this wasn’t an issue before though I haven’t been working with jme lately (I repent for my sins… getting back to work on it now).