Thomas Mortagne created MRRESOURCES-106:
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Summary: ProcessRemoteResourcesMojo#getProjects() can end up
consuming a lot of memory for big projects
Key: MRRESOURCES-106
URL: https://issues.apache.org/jira/browse/MRRESOURCES-106
Project: Maven Remote Resources Plugin
Issue Type: Bug
Affects Versions: 1.5
Reporter: Thomas Mortagne
At XWiki we are using the remote resource plugin to generate a NOTICE files we
put in the META-INF of all jars. The file can be found on
https://github.com/xwiki/xwiki-commons/blob/master/xwiki-commons-tools/xwiki-commons-tool-license-resources/src/main/resources/META-INF/NOTICE.vm.
We have a lot of memory issues and we kept increasing the max memory but it was
starting to be a bit insane (we now get a OOM with -Xmx2500m) so I finally took
a profiler to try to figure out where all this memory goes.
We did noticed for a while that remote resource plugin is taking longer and
longer to execute during the build so I had my doubts already.
What Yourkit is telling me is that almost half of the memory (400MB here
because I reduced the max memory for it to fail earlier) is retained by an
ArrayList of MavenProject instances located in
ProcessRemoteResourcesMojo#getProjects().
It can be reproduced by building https://github.com/xwiki/xwiki-platform (you
will need to add some repositories in your settings.xml, you can find them on
http://dev.xwiki.org/xwiki/bin/view/Community/Building/#HInstallingMaven).
Also I can probably put the memory dump I have somewhere if someone wants to
download it.
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