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Yes, this is related to

withDebug(true)

in a pretty subtle manner.

withDebug(true)

causes the test and thus Gradle run to be done in-process. When the test run is finished, the class loader on which the JGit classes reside gets closed as it should not be necessary anymore. The problem is, that JGit registers a shutdown hook that wants to do some cleanup. When these cleanup actions are run, classes that were not loaded before are needed (

NLS

in your stacktrace,

JGitText

when I try to execute it here). But as the class loader is closed already, the JarFile instances are closed already and thus the so-far unloaded class cannot be loaded from the jar file and get that exception after the test was actually successful already. I don't think you can do much about it besides making sure the classes that are needed get loaded before the class loader is closed.

alright, not going to worry about it then