Github user pluradj commented on the pull request:
https://github.com/apache/incubator-tinkerpop/pull/110#issuecomment-148801984
@dkuppitz `DependencyGrabber.copyDependenciesToPath()` throws two
exceptions explicitly, `IOException` and `IllegalStateException`.
`RuntimeException` occurs if there is an error grabbing grapes. This is the
initial bug report, and its failed directory should be rolled back.
`IOException` occurs if there are problems creating the directories under
`ext`. Rollback should occur here, but most likely there isn't even a directory
to delete.
`IllegalStateException` occurs if plugin module already exists. For
example, `tinkergraph-gremlin` is installed by default out of the box. If the
code doesn't catch the `IllegalStateException`, `tinkergraph-gremlin` would get
*uninstalled* if the user tried to install it a second time.
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