[groovy-dev] JDK 5 vs 6 with Eclipse IDE plugin: Bad version number in .class file

I've tried the "stable" release of the Eclipse plugin as well the as dev
version (as of today) and they are both exhibiting this same problem: 

I create a new Java project, add a groovy source folder, create a file, run
it via Run As Groovy. All's well. Then I make a change and try running it
again only to find that the plugin didn't recompile. Annoyed I right click
on the file in the Package Explorer and select "Compile Groovy File" (not
sure why this option exists.) In response I get an error dialog that says:

An internal error occurred during: "Compiling selected Groovy files.".
Bad version number in .class file

Once this occurs Eclipse starts acting horribly flakey. Various menu items
including Run As menu item won't draw. If you try running the groovy class
through the Run As dialog you get a NoClassDefFoundError. It's pretty awful.

I am developing on MacOS (Leopard.) Eclipse will have nothing to do with
Apple's 64 bit JVM (all that 32 bit Carbon code, I guess) so it's running on
a Java 5 JVM but I have configured it to use Apple's latest Java 1.6 as the
JRE because my team is using Java 6. 

Is the Groovy plugin hard coded to use the same JVM as Eclipse by any
chance?

I am completely dead in the water at this point. Does anyone have any ideas
about what's happening here or (more importantly) how to resolve it?

Thanks,
Mark

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