Github user 1ambda commented on the issue:
https://github.com/apache/zeppelin/pull/1639
@felizbear
I think something is happening while building `zeppelin-web` module
```
// recently passed PR CI:
https://travis-ci.org/apache/zeppelin/builds/177018840
https://api.travis-ci.org/jobs/177018842/log.txt?deansi=true
[INFO] Zeppelin: web Application .......................... SUCCESS [01:49
min]
// this PR CI: https://travis-ci.org/apache/zeppelin/builds/177211754
// https://api.travis-ci.org/jobs/177211756/log.txt?deansi=true
[INFO] Zeppelin: web Application .......................... SUCCESS [05:17
min]
```
All npm related commands (including grunt) are executed by maven (see
[zeppelin-web/pom.xml].(https://github.com/apache/zeppelin/blob/3eae4e0711924721db49b4e3b840282ca987a80c/zeppelin-web/pom.xml#L108-#L145))
I think this cause problems. I will move those command into `package.json`
and then give you feedback.
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