I'm sure it would be sufficient to submit Java code. They wouldn't necessarily be able to tell whether it was source or object code.

The late, great Ken Anderson faced this problem when he was working at BBN and the client (the government) insisted the app be written in Java. He and Tim Hickey and Peter Norvig wrote JScheme-- you program in Scheme, but get Java out at the end:

http://jscheme.sourceforge.net/jscheme/main.html