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These are minimal changes to support working on JRuby 9.2 and up,
which are the currently-supported JRuby versions. I was unable to
run the tests due to errors building (something in the toolchain
is using an http URL for Maven that no longer exists).
and removed in 9.3. The Signature version works on 9.2+.
IOException instances to their equivalent Ruby IOError subtypes.
There may be more work needed to get this fully-functional on
JRuby 9.2+ but this is at least a minimum set of changes.