Low Hanging Fruit
Some (comparatively :-)) easy tasks for those who want to get involved.
The code-gen for QAST::Op type xor needs porting. Potentially a bit fiddly, but should be mostly transliteration.
The code-gen for QAST::Op type chain needs porting.
invokedynamic code gen
Work out how to get BCEL to emit invokedynamic. Make sure we are able to do that from JAST also. Should be isolated to JASTToJVMBytecode.java and lib/JAST.