Fix CodeTailor Java version: : use JOBE to compile Java code in book_server

[xinyinghou]

• CodeTailor runs Java tests automatically in book_server_api, but Java test runs fail on the platform with: Error while running Java tests: [Errno 2] No such file or directory: 'javac'.
• This update uses the JOBE Java compiler.
• Also fixes formatting issues in existing CodeTailor files.

[bnmnetp]

We do not run javac on the book server. The JOBE server is set up to compile java. The book server cannot be having cpu cycles used for compiling programs.

[xinyinghou]

In this case, do you have any suggestions for handling this use case? Ideally, we want to run tests in book_server to verify that the personalized puzzles are correct in both Java and Python before sending them to students.

[xinyinghou]

I can submit a version that removes Java testing from the workshop pipeline for now, and I can follow up with Barb later to discuss a longer-term approach.

[bnmnetp]

Our JOBE server has its own well documented API for submitting code Java with unit tests and getting back the results. That is the right place for the short term and the long term.

[xinyinghou]

Thanks, I have switched to JOBE and now using the book_server-associated rsproxy.py. I tested and it works on my server.