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http://jira.codehaus.org/browse/MNG-4632?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benjamin Bentmann updated MNG-4632:
-----------------------------------
Assignee: Kristian Rosenvold
> Class loading is not thread-safe
> --------------------------------
>
> Key: MNG-4632
> URL: http://jira.codehaus.org/browse/MNG-4632
> Project: Maven 2 & 3
> Issue Type: Bug
> Components: Class Loading
> Affects Versions: 3.0-alpha-7
> Reporter: Benjamin Bentmann
> Assignee: Kristian Rosenvold
> Fix For: 3.0-beta-1
>
>
> During his work on parallel build execution, Kristian Rosenvold discovered
> {noformat}
> Caused by: java.lang.LinkageError: loader (instance of
> org/codehaus/plexus/classworlds/realm/ClassRealm): attempted duplicate class
> definition for name: "antlr/TokenWithIndex"
> at java.lang.ClassLoader.defineClass1(Native Method)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
> at
> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
> at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
> at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
> at
> org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:386)
> at
> org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
> at
> org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:244)
> at
> org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:230)
> at antlr.Utils.loadClass(Utils.java:18)
> at antlr.CharScanner.setTokenObjectClass(CharScanner.java:335)
> at org.antlr.tool.Grammar.parseAndBuildAST(Grammar.java:608)
> at org.antlr.Tool.getRootGrammar(Tool.java:612)
> at
> org.antlr.tool.BuildDependencyGenerator.<init>(BuildDependencyGenerator.java:89)
> at org.antlr.Tool.buildRequired(Tool.java:359)
> at org.antlr.Tool.process(Tool.java:423)
> at org.antlr.mojo.antlr3.Antlr3Mojo.execute(Antlr3Mojo.java:391)
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:105)
> ... 14 more
> {noformat}
> He also provided a patch for classworlds that was already applied
> [r8689|http://fisheye.codehaus.org/changelog/plexus/?cs=8689].
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