Here is the PR for disabling parallelism on Travis CI. I also took the opportunity to fix the JDK7 problem.

https://github.com/apache/calcite/pull/542


Mit freundlichen Grüßen,
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*Christian Beikov*
Am 20.09.2017 um 03:34 schrieb Julian Hyde:
Adding a parameter to control parallelism sounds fine. I’d prefer that the 
tests continue to run in parallel by default, but it’s fine to override in CI.


On Sep 19, 2017, at 4:34 AM, Christian Beikov <[email protected]> 
wrote:

I just wanted to give you a little update on this since I have to wait for a 
response now.

I tried to debug why the build hangs on the Travis CI infrastructure and it 
seems this is related to a known issue regarding parallel execution of 
parameterized tests: https://issues.apache.org/jira/browse/SUREFIRE-1264

When disabling the parallel execution, the tests should run without an issue. I 
suggest we introduce a property for configuring this and disable parallel 
execution on Travis CI until this issue is resolved. Would that be ok?

--

Mit freundlichen Grüßen,
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*Christian Beikov*

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