[core] [java] PMD is leaking file handles
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See https://github.com/pmd/pmd/pull/104 and https://github.com/gradle/gradle/pull/649#issuecomment-234936643
The following components don't close the input streams:
Additionally, the ant task should close the classloader, to release any file handles.
This will be fixed with PMD 5.3.8, 5.4.3, 5.5.1 and later.
Commit: https://github.com/pmd/pmd/commit/a491cef61c7aa24e320d3986b06f89ad3c9e4c2f