In fact, Travis tests are sometimes unstable, so they fail randomly. It looks that adding commons-lang3 isn't related. Could you try again without it?
In my experience, if some of Travis tests fail, amend the latest commit and force push is an effective way to rerun Travis. :-P [ Full content available at: https://github.com/apache/predictionio/pull/466 ] This message was relayed via gitbox.apache.org for devnull@infra.apache.org
