Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/105
@maropu Could you check CI error due to Spark test failure. Travis env has
been changed to Ubuntu Trusty and oraclejdk8 version might be changed.
`mvn -q scalastyle:check test -Pspark-2.1` is killed by some reason.
```
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option
MaxPermSize=512m; support was removed in 8.0
..
/home/travis/.travis/job_stages: line 57: 2845 Killed mvn
-q scalastyle:check test -Pspark-2.1
The command "mvn -q scalastyle:check test -Pspark-2.1" exited with 137.
178.12s$ mvn -q scalastyle:check clean -Pspark-2.0 -pl spark/spark-2.0 -am
test -Dtest=none
```
http://equj65.net/tech/java8hotspot/
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