Github user mgrzenda commented on the issue:
https://github.com/apache/incubator-samoa/pull/74
Here is a brief summary of findings and solution:
1) oraclejdk7 is no longer available in Travis. Hence, the old Travis
configuration failed.
2) openjdk7 was a suggested replacement
3) However, Travis builds based on openjdk7 are started, but never finish
(are killed because of inactivity)
4) This kind of hanging build can be obtained also on standalone Linux/ mvn
if _JAVA_OPTIONS are set as in Travis i.e. to "-Xmx2048m -Xms512m" and openjdk7
is used
5) Increasing memory limits in standalone mvn run resolves the problem 4),
but not in Travis builds. Travis builds are still hanging in HDFS-related
tests, as before even with less restrictive memory settings and forced garbage
collection (see the list of commits to this JIRA issue for different options)
6) The ultimate working solution is to replace oraclejdk7 with oraclejdk8.
This seems to be acceptable solution.
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