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> The project for some compilers courses is implementing a compiler for a subset for Java. Would the current ruling mean that doing the project is copyright infringement?

Fair use would probably protect you because you're doing it for non-commercial educational purposes. But further, this lawsuit is not over the Java language, but it's libraries.

Probably not, but if you're worried derive your work from the OpenJDK implementation that has a valid GPL + linking exception license granted by Oracle, and comply with the license (which basically just means licensing your course project GPL + linking exception and supplying source code whenever you supply a binary).

I doubt so. There's fair use. And educational institutions tend to use this fair use exception a lot.