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
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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