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Kohsuke Kawaguchi
2f9dff73c6
Plexus compiler 1.8.6 that maven-compiler-plugin 2.4 has a static field to store a reference to the Javac class in tools.jar In JDK that I use (6u26), Javac has a static field that stores what appears to be a cache of jar files (ZipFileIndex.zipFileIndexCache). And in addition, Maven instantiates a separate ClassRealm to host plugin jar files when a project has any build extensions. The combined result is that during a build, we end up having multiple copies of URLClassLoader that loads tools.jar, and each ends up caching jar files it was used. This puts a pressure to permgen (although I couldn't pinpoint which portions of those caches use permgen), resulting in OOME. In Plexus compiler 1.9, Olivier added a new feature to control the caching/reuse of Javac compiler. While this apparently was done primarily for fixing concurrency issues in multi-threaded builds, it is also a useful mechanism to prevent the retention of Javac classes. So I pushed the SNAPSHOT version of maven-compiler-plugin as 2.5-jenkins-1 and tweaking POM to use it.
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Copyright © 2004-, Kohsuke Kawaguchi, Sun Microsystems, Inc., and a number of other of contributers. Licensed under MIT License.
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