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Fix classloader memory leak, due to ClassTag #10500

Open

jtjeferreira wants to merge 4 commits into playframework:master from jtjeferreira:workaround_classtag_leaks

Contributor

jtjeferreira commented Oct 26, 2020 •

edited

Pull Request Checklist

Helpful things

Fixes

Fixes classloader memory leak, due to ClassTag

Purpose

Launches scripted tests with a limited metaspace size. With this change most of the tests fail. After analyzing the heap dump in yourkit profiler, one can see that ClassTag#cache is not allowing the classloaders created by play to be GCd.

The fix is to separate the classloader that loads ClassTag from the classloaders that load the rest of the application classes (libraries and user code), and then the classloaders can be GCd.

I also opened a PR in scala (scala/scala#9276), but I also managed to fix it in play-plugin. As you can see in that PR discussion this is not a problem in scala 2.13, but the scripted tests only run with scala 2.12

References

#9935
scala/scala#9276


          fight leaks

f56bd52

jtjeferreira changed the title ~~fight leaks~~ Fix classloader memory leak, due to ClassTag

mkurz added this to the 2.8.4 milestone


          scalafmt

89ea801

dwijnand reviewed

dev-mode/sbt-plugin/src/main/scala/play/sbt/PlayCommands.scala Outdated Show resolved Hide resolved


          address feedback

3de8743

jtjeferreira mentioned this pull request

fix ClassTag#cache leak scala/scala#9276

Open


          scalafmt

f55f5a2

ignasi35 modified the milestones: 2.8.4, 2.8.5, 2.8.6

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