Github user karuppayya commented on the issue:
https://github.com/apache/zeppelin/pull/2403
@jongyoul The error in bulld doesnt seem to be related to my change.
https://travis-ci.org/karuppayya/zeppelin/jobs/244000638
`Caused by: org.openqa.selenium.NoSuchElementException: Unable to locate
element: {"method":"xpath","selector":"//i[@uib-tooltip='WebSocket
Connected']"}`
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