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https://jira.codehaus.org/browse/SUREFIRE-1132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=359869#comment-359869
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Andreas Gudian commented on SUREFIRE-1132:
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A workaround that should indeed work is updating to 2.18.1 and setting
forkCount=1, as the classloaders can't be more isolated than that.
Depending on the size of your modules, you might see much less required memory
for the main maven process, but you'll have to account for the memory
consumption of the forked processes. With -T10, you'll end up with up to 10
forked processes at once (one for each module being in phase "test").
Note: with 2.18.1, you can also set redirectTestOutputToFile=true again, as the
bug that we had there was fixed in 2.18 (and another, related to the
GC-logging, in 2.18.1).
The workaround aside, we should still check out the behaviour of the
classloader in parallel maven builds (-T >1) and forkCount=0.
> Surefire: regular isolated classloader failures in parallelbuild
> ----------------------------------------------------------------
>
> Key: SUREFIRE-1132
> URL: https://jira.codehaus.org/browse/SUREFIRE-1132
> Project: Maven Surefire
> Issue Type: Bug
> Components: classloading
> Affects Versions: 2.17
> Environment: SLES 3.0.80-0.7-default SMP x86_64 GNU/Linux
> windows server 2008 x64
> Maven 3.2.2, 3.2.3, 3.2.5
> Oracle HotSpot JDK 7u25
> Reporter: Alexander Ashitkin
> Attachments: consoleText-1.txt, consoleText-2.txt, consoleText-3.txt
>
>
> We have a large project of 300+ modules which regularly fails with different
> kind of classloading issues in different places in surefire plugin. The issue
> is reproduced only with parallel build and is not reproduced in single
> threaded. This is a main contributor in build instability for us. All the not
> loaded dependnecies are actually present in dependency tree. I attached 3
> different samples of how build fails.
> Surefire config:
> {code}
> <configuration>
> <forkCount>0</forkCount>
> <!--doesnt work in parrallel build. Causes build
> failures with error java.io.IOException: Stream Closed-->
> <redirectTestOutputToFile>false</redirectTestOutputToFile>
> <useManifestOnlyJar>false</useManifestOnlyJar>
> </configuration>
> {code}
> maven cmd is like install -T 10
> Please advise how to sort this out - ready to run any provided diagnostic
> and evaluate any options.
> Thanks in advance, Alexander
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