[TxMt] Javascript Tools bundle and Google Closure Compiler?

Hi all-

I just installed subtleGradient's Javascript Tools bundle and tried the "Validate with Google Closure Compiler" and got this:

Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:676) [snip] at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:375)

I'm not hugely Java-literate, but I surmise, using Leopard 10.5.8 here, that GCC wants Java version 6 here, and my Java preferences are set to 32-bit Java 5, and then 64-bit Java 6.

So can I run this with the Java 6 installed in Leopard? And can I alter subtleGradient's "lint-gcc.rb" to run Java 6 rather than setting my global preferences? How?

Many thanks in advance!

Charles