Investigate the feasibility of setting up CI builds/tests with another JDK

[cyrille-artho]

To reproduce the build/test failures we have on some systems, we currently use a local build. It would be desirable to have another build pipeline on CI to automate this task.
It is not sure if that is feasible due to licensing issues; can someone please investigate this?
As a starter, we want to see exactly which package needs to be used to reproduce the problems with the remaining two unit tests.

[cyrille-artho]

With a quick search, I could only find ways to set up Oracle Java version 17 and later.
Perhaps we can try to fix the current (very few) issues with version 11 by testing offline, once all the other version 11-related issues are resolved. After that, we can try out version 17, the next LTS version after 11.

[cyrille-artho]

Another way to deal with this is to make the code compilable against Oracle's JDK v11 but without fully implementing the functionality that is covered by the failing tests. The few tests that fail can then be run conditionally (skipping them for OpenJDK): https://www.baeldung.com/junit-5-conditional-test-execution