That wouldn't make sense. The
java compiler takes source files and produces class files on a 1-to-1 basis. What would you expect a multi-targeted compile to do? Replicate all of the outputs in all of the directories? Or randomly scatter classes among them?
If you just want to make multiple copies of a set of classes, just run a copy after the compile. That's the Unix approach - don't make 1 complex specialized program when you can make 2 simple general ones do the job.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.