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https://jira.codehaus.org/browse/MNG-5493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=339896#comment-339896
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Jason van Zyl commented on MNG-5493:
------------------------------------
Please read
https://cwiki.apache.org/confluence/display/MAVEN/Submitting+Issue+for+Maven's+Core
The POMs are all read before the build executes concurrently. So it's hard to
diagnose without a sample. If the assembly plugin is modifying these properties
at runtime that's probabably not good.
> 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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