[jira] (MNG-5493) Concurrency exception in Maven core while using parallel build

["Pengfei Zhang (JIRA)" <ji...@codehaus.org>]

Pengfei Zhang created MNG-5493:
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             Summary: 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: 3.0.5, 3.0.3
            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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