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I have just submitted a couple of PR that fixes this issue on my Windows machine.
Essentially, the issue is caused by URLClassLoader that is caching file handles for later reuse (cf. https://bugs.openjdk.java.net/browse/JDK-8013099).
I have no idea yet about the possible performance issues it may trigger, but definitely these were the causes for file handle retention.
Kudos to Kohsuke Kawaguchi for his file leak detector, that really helped to pinpoint the leak location.