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https://issues.apache.org/jira/browse/MAHOUT-1345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13829750#comment-13829750
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Dawid Weiss commented on MAHOUT-1345:
-------------------------------------
This means the code starts (touches) an AWT subsystem somehow and starts a
background system thread. Workarounds:
- add java.awt.headless=true to junit4 sysprops:
{code}<sysproperty key="java.awt.headless" value="true"/>{code}
- ignore this particular system thread by adding:
{code}
@@ThreadLeakFilters(defaultFilters = true, filters = {
QuickPatchThreadsFilter.class
})
{code}
to all test classes where this is the case (or a subclass of all test classes).
QuickPatchThreadsFilter is a custom thread filter from Lucene, but I believe
default filter set also ignores AWT subsystem so just defaultFilters=true
should do.
> Enable randomised testing for all Mahout modules
> ------------------------------------------------
>
> Key: MAHOUT-1345
> URL: https://issues.apache.org/jira/browse/MAHOUT-1345
> Project: Mahout
> Issue Type: Improvement
> Affects Versions: 0.8
> Reporter: Isabel Drost-Fromm
> Priority: Minor
> Fix For: 0.9
>
> Attachments: MAHOUT-1345.diff
>
>
> When enabling randomised testing for all modules I found a few tests became
> unstable or even fail deterministically due to lingering threads. The
> attached patch:
> * defines the randomised testing dependency in our parent pom
> * re-uses said dependencies in all depending modules (makes upgrading easier
> as the version number needs to be changed in just one place)
> * adds several code changes that fixed the failures due to lingering threads
> for me on my machine. I'd greatly appreciate input a) from those who wrote
> the respective code and b) others who ran the tests with these changes to
> make sure there are no other tests that suffer from the same issues.
> Warning: I touched quite a few bits and pieces I'm not intimately familiar
> with over the last few weeks (whenever I had a few spare minutes) - second
> pair of eyes needed.
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