Github user ahgittin commented on the issue:
https://github.com/apache/brooklyn-server/pull/560
working on the basis that the `getResource(..).getFile()` call might do
URL-escaping when we say `getResource()` and then not properly unescape it when
we do `getFile()`. that technique isn't guaranteed to work (definitely not if
tests are run from JARs), this is just another failure case we hadn't
encountered.
will rewrite to extract that entire folder.
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