[ 
https://jira.codehaus.org/browse/MSHARED-223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=304642#comment-304642
 ] 

Alexander Shabanov commented on MSHARED-223:
--------------------------------------------

I confirm that the issue reproduces on maven 3.0.4.
The stacktrace is as follows:


Execution checkstyle of goal 
org.apache.maven.plugins:maven-checkstyle-plugin:2.4:checkstyle 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.MojoExecutor.executeForkedExecutions(MojoExecutor.java:365)
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:199)
        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.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:320)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        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.plugin.PluginExecutionException: Execution 
checkstyle of goal 
org.apache.maven.plugins:maven-checkstyle-plugin:2.4:checkstyle failed.
        at 
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:110)
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
        ... 23 more
Caused by: java.lang.NullPointerException
        at 
org.apache.maven.plugin.checkstyle.rss.DefaultCheckstyleRssGenerator.generateRSS(DefaultCheckstyleRssGenerator.java:72)
        at 
org.apache.maven.plugin.checkstyle.CheckstyleReport.executeReport(CheckstyleReport.java:639)
        at 
org.apache.maven.reporting.AbstractMavenReport.generate(AbstractMavenReport.java:131)
        at 
org.apache.maven.reporting.AbstractMavenReport.execute(AbstractMavenReport.java:76)
        at 
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
        ... 24 more

Hope this helps.
                
> NullPointerException in maven-resources-plugin
> ----------------------------------------------
>
>                 Key: MSHARED-223
>                 URL: https://jira.codehaus.org/browse/MSHARED-223
>             Project: Maven Shared Components
>          Issue Type: Bug
>          Components: maven-filtering
>    Affects Versions: maven-filtering-1.0
>         Environment: centos 5.x
> maven 3.0.3
> TeamCity Enterprise Version 6.5.2 (build 17935) 
> Java(TM) SE Runtime Environment (build 1.6.0_21-b06)
> Java HotSpot(TM) 64-Bit Server VM (build 17.0-b16, mixed mode)
>            Reporter: Eran Harel
>
> About twice a day we get a NullPointerException in our build:
> {noformat}
> [06:44:23]: [ERROR] Failed to execute goal 
> org.apache.maven.plugins:maven-resources-plugin:2.5:resources 
> (default-resources) on project spring-lib: Execution default-resources of 
> goal org.apache.maven.plugins:maven-resources-plugin:2.5:resources failed. 
> NullPointerException -> [Help 1]
> [06:44:23]: org.apache.maven.lifecycle.LifecycleExecutionException: Failed to 
> execute goal org.apache.maven.plugins:maven-resources-plugin:2.5:resources 
> (default-resources) on project spring-lib: Execution default-resources of 
> goal org.apache.maven.plugins:maven-resources-plugin:2.5:resources failed.
> [06:44:23]: at 
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:225)
> [06:44:23]: at 
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
> [06:44:23]: at 
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
> [06:44:23]: at 
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
> [06:44:23]: at 
> org.apache.maven.lifecycle.internal.LifecycleThreadedBuilder$1.call(LifecycleThreadedBuilder.java:167)
> [06:44:23]: at 
> org.apache.maven.lifecycle.internal.LifecycleThreadedBuilder$1.call(LifecycleThreadedBuilder.java:164)
> [06:44:23]: at 
> java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> [06:44:23]: at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> [06:44:23]: at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
> [06:44:23]: at 
> java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> [06:44:23]: at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> [06:44:23]: at 
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> [06:44:23]: at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> [06:44:23]: at java.lang.Thread.run(Thread.java:619)
> [06:44:23]: Caused by: org.apache.maven.plugin.PluginExecutionException: 
> Execution default-resources of goal 
> org.apache.maven.plugins:maven-resources-plugin:2.5:resources failed.
> [06:44:23]: at 
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:110)
> [06:44:23]: at 
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
> [06:44:23]: ... 13 more
> [06:44:23]: Caused by: java.lang.NullPointerException
> [06:44:23]: at java.util.ArrayList.<init>(ArrayList.java:131)
> [06:44:23]: at 
> org.apache.maven.shared.filtering.DefaultMavenResourcesFiltering.filteredFileExtension(DefaultMavenResourcesFiltering.java:115)
> [06:44:23]: at 
> org.apache.maven.shared.filtering.DefaultMavenResourcesFiltering.filterResources(DefaultMavenResourcesFiltering.java:264)
> [06:44:23]: at 
> org.apache.maven.plugin.resources.ResourcesMojo.execute(ResourcesMojo.java:310)
> [06:44:23]: at 
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
> [06:44:23]: ... 14 more
> {noformat}
> This comes at random times, and the next build doesn't fail.
> I've googled for this failure and found nothing. I have this gut feeling that 
> this may be caused by a concurrency issue in the maven-resources-plugin.
> We got this error with maven-resources-plugin 2.4.3, and now with 2.5. Our 
> maven version is 3.0.3.
> We execute the build on TeamCity with the following parameters:
> {noformat}
> Goals: install
> Additional Maven command line parameters: -T 2C -e -P!releasex,integration 
> -Dmaven.test.failure.ignore=true -Dmaven.test.error.ignore=true 
> -Dmaven.test.haltafterfailure=false -Dmaven.junit.timeout=1000000
> -DwarProject.packaging=jar
> {noformat}

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