AnnotationsTest.java creates a temporary directory for the test but does not clean it up later:


cat -n jdk/test/java/lang/ModuleTests/AnnotationsTest.java
   [...]
    77 Path dir = Files.createTempDirectory("mods");

The preferred approach would be to create temporary test files under the jtreg property user.dir instead, if it is defined.

During a jtreg run, user.dir has the value $PWD/JTwork/scratch