[
http://jira.codehaus.org/browse/MNG-4864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Benjamin Bentmann closed MNG-4864.
----------------------------------
Resolution: Fixed
Fix Version/s: 3.0.1
Assignee: Benjamin Bentmann
That the update from 1.5.0_12 to 1.5.0_22 solves the issue puzzles me as I
don't see any changes in the source code for {{ConcurrentHashMap}} nor any
relevant bug mentioned in the release notes.
According to the API doc for
[{{ConcurrentHashMap.entrySet()}}|http://download.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/ConcurrentHashMap.html#entrySet%28%29]:
bq. The view's returned iterator is a "weakly consistent" iterator that will
never throw ConcurrentModificationException, and guarantees to traverse
elements as they existed upon construction of the iterator, and may (but is not
guaranteed to) reflect any modifications subsequent to construction.
To my understanding, this means simple iterating over {{ConcurrentHashMap}} as
excercised in our code should be safe (i.e. return sane values) despite
concurrent updates even without higher-level locking.
The best explanation I can imagine is [JRE bug
#6312056|http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6312056] for which
a guard has been added in
[r1023501|http://svn.apache.org/viewvc?view=revision&revision=1023501].
> npe when transferring artifacts
> -------------------------------
>
> Key: MNG-4864
> URL: http://jira.codehaus.org/browse/MNG-4864
> Project: Maven 2 & 3
> Issue Type: Bug
> Affects Versions: 3.0
> Reporter: jgon2
> Assignee: Benjamin Bentmann
> Fix For: 3.0.1
>
>
> I get the following NPE when running a mvn clean install with an empty local
> repository. The two stracktraces below show that the build breaks with
> different artifacts but always at the same place.
> If I relaunch the build several times, it finally succeeds.
> {code}
> Caused by: java.lang.NullPointerException
> at
> org.apache.maven.cli.ConsoleMavenTransferListener.transferProgressed(ConsoleMavenTransferListener.java:60)
>
> [ERROR] Failed to execute goal on project stdlib-core: Could not resolve
> dependencies for project com.mycompany:stdlib-core:jar:3.0.0-SNAPSHOT: Could
> not transfer artifact org.apache.maven:maven-repository-metadata:jar:2.0.8
> from nexus (http://maven/nexus/content/groups/public): NullPointerException
> -> [Help 1]
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
> goal on project stdlib-core: Could not resolve dependencies for project
> com.mycompany:stdlib-core:jar:3.0.0-SNAPSHOT: Could not transfer artifact
> org.apache.maven:maven-repository-metadata:jar:2.0.8 from nexus
> (http://maven/nexus/content/groups/public): NullPointerException
> at
> org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies(LifecycleDependencyResolver.java:190)
>
> at
> org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resolveProjectDependencies(LifecycleDependencyResolver.java:104)
>
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAreResolved(MojoExecutor.java:244)
>
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:187)
>
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:148)
>
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:140)
>
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
>
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
>
> at
> org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
>
> at
> org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
>
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:314)
> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:151)
> at org.apache.maven.cli.MavenCli.execute(MavenCli.java:445)
> at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:168)
> at org.apache.maven.cli.MavenCli.main(MavenCli.java:132)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>
> at java.lang.reflect.Method.invoke(Method.java:585)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
>
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
>
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
> Caused by: org.apache.maven.project.DependencyResolutionException: Could not
> resolve dependencies for project
> com.mycompany:stdlib-core:jar:3.0.0-SNAPSHOT: Could not transfer artifact
> org.apache.maven:maven-repository-metadata:jar:2.0.8 from nexus
> (http://maven/nexus/content/groups/public): NullPointerException
> at
> org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:156)
>
> at
> org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies(LifecycleDependencyResolver.java:165)
>
> ... 22 more
> Caused by: org.sonatype.aether.resolution.ArtifactResolutionException: Could
> not transfer artifact org.apache.maven:maven-repository-metadata:jar:2.0.8
> from nexus (http://maven/nexus/content/groups/public): NullPointerException
> at
> org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:488)
>
> at
> org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveArtifacts(DefaultRepositorySystem.java:258)
>
> at
> org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveDependencies(DefaultRepositorySystem.java:288)
>
> at
> org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:150)
>
> ... 23 more
> Caused by: org.sonatype.aether.transfer.ArtifactTransferException: Could not
> transfer artifact org.apache.maven:maven-repository-metadata:jar:2.0.8 from
> nexus (http://maven/nexus/content/groups/public): NullPointerException
> at
> org.sonatype.aether.connector.wagon.WagonRepositoryConnector$4.wrap(WagonRepositoryConnector.java:858)
>
> at
> org.sonatype.aether.connector.wagon.WagonRepositoryConnector$4.wrap(WagonRepositoryConnector.java:849)
>
> at
> org.sonatype.aether.connector.wagon.WagonRepositoryConnector$GetTask.flush(WagonRepositoryConnector.java:602)
>
> at
> org.sonatype.aether.connector.wagon.WagonRepositoryConnector$GetTask.flush(WagonRepositoryConnector.java:596)
>
> at
> org.sonatype.aether.connector.wagon.WagonRepositoryConnector.get(WagonRepositoryConnector.java:355)
>
> at
> org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:407)
>
> ... 26 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.maven.cli.ConsoleMavenTransferListener.transferProgressed(ConsoleMavenTransferListener.java:60)
>
> at
> org.sonatype.aether.connector.wagon.WagonTransferListenerAdapter.transferProgress(WagonTransferListenerAdapter.java:69)
>
> at
> org.apache.maven.wagon.events.TransferEventSupport.fireTransferProgress(TransferEventSupport.java:124)
>
> at
> org.apache.maven.wagon.AbstractWagon.fireTransferProgress(AbstractWagon.java:505)
>
> at
> org.apache.maven.wagon.AbstractWagon.transfer(AbstractWagon.java:490)
> at
> org.apache.maven.wagon.AbstractWagon.getTransfer(AbstractWagon.java:328)
> at
> org.apache.maven.wagon.AbstractWagon.getTransfer(AbstractWagon.java:299)
> at
> org.apache.maven.wagon.AbstractWagon.getTransfer(AbstractWagon.java:276)
> at org.apache.maven.wagon.StreamWagon.getIfNewer(StreamWagon.java:97)
> at org.apache.maven.wagon.StreamWagon.get(StreamWagon.java:61)
> at
> org.sonatype.aether.connector.wagon.WagonRepositoryConnector$GetTask.run(WagonRepositoryConnector.java:511)
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
>
> at java.lang.Thread.run(Thread.java:595)
> [ERROR] Failed to execute goal on project stdlib-native: Could not resolve
> dependencies for project com.mycompany:stdlib-native:jar:3.0.0-SNAPSHOT:
> Could not transfer artifact org.jboss.security:jbosssx-client:jar:2.0.3.SP1
> from nexus (http://maven/nexus/content/groups/public): NullPointerException
> -> [Help 1]
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
> goal on project stdlib-native: Could not resolve dependencies for project
> com.mycompany:stdlib-native:jar:3.0.0-SNAPSHOT: Could not transfer artifact
> org.jboss.security:jbosssx-client:jar:2.0.3.SP1 from nexus
> (http://maven/nexus/content/groups/public): NullPointerException
> at
> org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies(LifecycleDependencyResolver.java:190)
>
> at
> org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resolveProjectDependencies(LifecycleDependencyResolver.java:104)
>
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAreResolved(MojoExecutor.java:244)
>
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:187)
>
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:148)
>
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:140)
>
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
>
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
>
> at
> org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
>
> at
> org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
>
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:314)
> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:151)
> at org.apache.maven.cli.MavenCli.execute(MavenCli.java:445)
> at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:168)
> at org.apache.maven.cli.MavenCli.main(MavenCli.java:132)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>
> at java.lang.reflect.Method.invoke(Method.java:585)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
>
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
>
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
> Caused by: org.apache.maven.project.DependencyResolutionException: Could not
> resolve dependencies for project
> com.mycompany:stdlib-native:jar:3.0.0-SNAPSHOT: Could not transfer artifact
> org.jboss.security:jbosssx-client:jar:2.0.3.SP1 from nexus
> (http://maven/nexus/content/groups/public): NullPointerException
> at
> org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:156)
>
> at
> org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies(LifecycleDependencyResolver.java:165)
>
> ... 22 more
> Caused by: org.sonatype.aether.resolution.ArtifactResolutionException: Could
> not transfer artifact org.jboss.security:jbosssx-client:jar:2.0.3.SP1 from
> nexus (http://maven/nexus/content/groups/public): NullPointerException
> at
> org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:488)
>
> at
> org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveArtifacts(DefaultRepositorySystem.java:258)
>
> at
> org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveDependencies(DefaultRepositorySystem.java:288)
>
> at
> org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:150)
>
> ... 23 more
> Caused by: org.sonatype.aether.transfer.ArtifactTransferException: Could not
> transfer artifact org.jboss.security:jbosssx-client:jar:2.0.3.SP1 from nexus
> (http://maven/nexus/content/groups/public): NullPointerException
> at
> org.sonatype.aether.connector.wagon.WagonRepositoryConnector$4.wrap(WagonRepositoryConnector.java:858)
>
> at
> org.sonatype.aether.connector.wagon.WagonRepositoryConnector$4.wrap(WagonRepositoryConnector.java:849)
>
> at
> org.sonatype.aether.connector.wagon.WagonRepositoryConnector$GetTask.flush(WagonRepositoryConnector.java:602)
>
> at
> org.sonatype.aether.connector.wagon.WagonRepositoryConnector$GetTask.flush(WagonRepositoryConnector.java:596)
>
> at
> org.sonatype.aether.connector.wagon.WagonRepositoryConnector.get(WagonRepositoryConnector.java:355)
>
> at
> org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:407)
>
> ... 26 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.maven.cli.ConsoleMavenTransferListener.transferProgressed(ConsoleMavenTransferListener.java:60)
>
> at
> org.sonatype.aether.connector.wagon.WagonTransferListenerAdapter.transferProgress(WagonTransferListenerAdapter.java:69)
>
> at
> org.apache.maven.wagon.events.TransferEventSupport.fireTransferProgress(TransferEventSupport.java:124)
>
> at
> org.apache.maven.wagon.AbstractWagon.fireTransferProgress(AbstractWagon.java:505)
>
> at
> org.apache.maven.wagon.AbstractWagon.transfer(AbstractWagon.java:490)
> at
> org.apache.maven.wagon.AbstractWagon.getTransfer(AbstractWagon.java:328)
> at
> org.apache.maven.wagon.AbstractWagon.getTransfer(AbstractWagon.java:299)
> at
> org.apache.maven.wagon.AbstractWagon.getTransfer(AbstractWagon.java:276)
> at org.apache.maven.wagon.StreamWagon.getIfNewer(StreamWagon.java:97)
> at org.apache.maven.wagon.StreamWagon.get(StreamWagon.java:61)
> at
> org.sonatype.aether.connector.wagon.WagonRepositoryConnector$GetTask.run(WagonRepositoryConnector.java:511)
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
>
> at java.lang.Thread.run(Thread.java:595)
> {code}
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