"Seems like there's some compilation issue with :exceptions:compileJmhJava."

The build for classes/compileJava -- using the Tags class -- knows to skip files marked with

// {CompileTimeError}

The problem here is that the compileJmhJava task is not, apparently, using the same approach and so is trying to compile TryAnything.java (and it would presumably try to compile the rest). What's not clear to me is how to make the "Tagged" build approach the universal one, so that compileJmhJava will also use it. Another approach might be to make compileJmhJava only work on the specific jmh subdirectories, although I can't tell if that would make sense.