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https://jira.codehaus.org/browse/MNG-5493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=347647#comment-347647
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Mike Beaubien commented on MNG-5493:
------------------------------------
We're facing a similar issue, we see it when doing parallel builds, here's the
relevant stack trace:
Caused by: java.util.ConcurrentModificationException
at java.util.Hashtable$Enumerator.next(Hashtable.java:1200)
at java.util.Hashtable.putAll(Hashtable.java:614)
at
org.apache.maven.project.artifact.MavenMetadataSource.getSystemProperties(MavenMetadataSource.java:757)
at
org.apache.maven.project.artifact.MavenMetadataSource.retrieveRelocatedProject(MavenMetadataSource.java:575)
at
org.apache.maven.project.artifact.MavenMetadataSource.retrieve(MavenMetadataSource.java:191)
at
org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.recurse(DefaultLegacyArtifactCollector.java:532)
at
org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.recurse(DefaultLegacyArtifactCollector.java:584)
at
org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.collect(DefaultLegacyArtifactCollector.java:144)
at
org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:494)
at
org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolveWithExceptions(DefaultArtifactResolver.java:350)
at
org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolveTransitively(DefaultArtifactResolver.java:344)
at
org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolveTransitively(DefaultArtifactResolver.java:319)
at
org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolveTransitively(DefaultArtifactResolver.java:288)
at
org.apache.maven.plugin.assembly.artifact.DefaultDependencyResolver.resolveTransitively(DefaultDependencyResolver.java:200)
at
org.apache.maven.plugin.assembly.artifact.DefaultDependencyResolver.resolve(DefaultDependencyResolver.java:122)
at
org.apache.maven.plugin.assembly.archive.DefaultAssemblyArchiver.createArchive(DefaultAssemblyArchiver.java:177)
at
org.apache.maven.plugin.assembly.mojos.AbstractAssemblyMojo.execute(AbstractAssemblyMojo.java:436)
at
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:133)
... 14 more
I looked at the source, this is caused because
org.apache.maven.project.artifact.MavenMetadataSource.getSystemProperties is
copying System.getProperties() into a new Properties object. The result of
System.getProperties() is not cloned, so if another thread gets in there and
adds something to the System properites during the copy, you get the exception.
I'd recommend you go and catch the concurrent mod exception here and re-try.
I'll submit a patch in the meantime.
Thanks,
Mike
> Concurrency exception in Maven core while using parallel build
> --------------------------------------------------------------
>
> Key: MNG-5493
> URL: https://jira.codehaus.org/browse/MNG-5493
> Project: Maven 2 & 3
> Issue Type: Bug
> Components: Deployment, Errors, General, Plugins and Lifecycle
> Affects Versions: 3.0.3, 3.0.5
> Reporter: Pengfei Zhang
>
> My project uses parallel build for my "deployment" job in Hudson. From time
> to time, the build failed because of the following
> ConcurrencyModificationException. This apparently is not a plugin-in bug.
> Instead, it is a deeper issue in the core. I checked the source code, I think
> the "Properties" should be replaced by a concurrentHashMap. Accordingt to the
> java doc of "Properties", it cannot support concurrency.
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
> goal org.apache.maven.plugins:maven-assembly-plugin:2.4:single
> (make-assembly) on project ssm-viewer-spread: Execution make-assembly of goal
> org.apache.maven.plugins:maven-assembly-plugin:2.4:single failed.
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:225)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
> at
> org.apache.maven.lifecycle.internal.LifecycleThreadedBuilder$1.call(LifecycleThreadedBuilder.java:167)
> at
> org.apache.maven.lifecycle.internal.LifecycleThreadedBuilder$1.call(LifecycleThreadedBuilder.java:163)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
> at java.util.concurrent.FutureTask.run(FutureTask.java:166)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
> at java.util.concurrent.FutureTask.run(FutureTask.java:166)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:722)
> Caused by: org.apache.maven.plugin.PluginExecutionException: Execution
> make-assembly of goal
> org.apache.maven.plugins:maven-assembly-plugin:2.4:single failed.
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:110)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
> ... 13 more
> Caused by: java.util.ConcurrentModificationException
> at java.util.Hashtable$Enumerator.next(Hashtable.java:1200)
> at java.util.Hashtable.putAll(Hashtable.java:614)
> at
> org.apache.maven.project.DefaultProjectBuildingRequest.setSystemProperties(DefaultProjectBuildingRequest.java:166)
> at
> org.apache.maven.project.DefaultMavenProjectBuilder.toRequest(DefaultMavenProjectBuilder.java:79)
> at
> org.apache.maven.project.DefaultMavenProjectBuilder.buildFromRepository(DefaultMavenProjectBuilder.java:229)
> at
> org.apache.maven.project.DefaultMavenProjectBuilder.buildFromRepository(DefaultMavenProjectBuilder.java:251)
> at
> org.apache.maven.project.DefaultMavenProjectBuilder.buildFromRepository(DefaultMavenProjectBuilder.java:258)
> at
> org.apache.maven.plugin.assembly.archive.task.AddDependencySetsTask.addDependencySet(AddDependencySetsTask.java:162)
> at
> org.apache.maven.plugin.assembly.archive.task.AddDependencySetsTask.execute(AddDependencySetsTask.java:124)
> at
> org.apache.maven.plugin.assembly.archive.phase.DependencySetAssemblyPhase.execute(DependencySetAssemblyPhase.java:76)
> at
> org.apache.maven.plugin.assembly.archive.DefaultAssemblyArchiver.createArchive(DefaultAssemblyArchiver.java:183)
> at
> org.apache.maven.plugin.assembly.mojos.AbstractAssemblyMojo.execute(AbstractAssemblyMojo.java:436)
> at org.apache.maven
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