Open source Java project with unit tests and logging for educational purposes?

Question

Java

Good afternoon!
You need an open source project that can be run "as is", that is, not as a lib, but as a separate application. The project must contain unit tests, and also have logging. Any framework or library is suitable for logging, even JUL. Need a project for educational purposes for the university.
3 main points:

• the code is written in Java
  
• availability of unit tests
  
• logging, logging