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https://jira.codehaus.org/browse/MCHECKSTYLE-230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=351574#comment-351574
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Herve Boutemy commented on MCHECKSTYLE-230:
-------------------------------------------
notice that there is an alternative solution studied in MCHECKSTYLE-244, which
does not require PLXCOMP-237 but instead extend plexus-resources in a more
consistent manner with the actual component structure
> ConcurrentModificationException in FileResourceLoader.getResource
> -----------------------------------------------------------------
>
> Key: MCHECKSTYLE-230
> URL: https://jira.codehaus.org/browse/MCHECKSTYLE-230
> Project: Maven Checkstyle Plugin
> Issue Type: Bug
> Affects Versions: 2.12.1
> Reporter: Andrew Gaul
> Fix For: 2.13
>
>
> I encountered a ConcurrentModificationException when running:
> {noformat}
> mvn checkstyle:checkstyle -e -T 4
> {noformat}
> against the jclouds code base:
> {noformat}
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-checkstyle-plugin:2.12.1:checkstyle
> (default-cli) on project ultradns-ws: Execution default-cli of goal
> org.apache.maven.plugins:maven-checkstyle-plugin:2.12.1:checkstyle failed.
> ConcurrentModificationException -> [Help 1]
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
> goal org.apache.maven.plugins:maven-checkstyle-plugin:2.12.1:checkstyle
> (default-cli) on project ultradns-ws: Execution default-cli of goal
> org.apache.maven.plugins:maven-checkstyle-plugin:2.12.1:checkstyle failed.
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:224)
> 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:169)
> at
> org.apache.maven.lifecycle.internal.LifecycleThreadedBuilder$1.call(LifecycleThreadedBuilder.java:165)
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>
> at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.maven.plugin.PluginExecutionException: Execution
> default-cli of goal
> org.apache.maven.plugins:maven-checkstyle-plugin:2.12.1:checkstyle failed.
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:115)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
> ... 11 more
> Caused by: java.util.ConcurrentModificationException
> at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859)
> at java.util.ArrayList$Itr.next(ArrayList.java:831)
> at
> org.codehaus.plexus.resource.loader.FileResourceLoader.getResource(FileResourceLoader.java:56)
> at
> org.apache.maven.plugin.checkstyle.resource.LicenseResourceManager.getResource(LicenseResourceManager.java:70)
> at
> org.codehaus.plexus.resource.DefaultResourceManager.getResourceAsFile(DefaultResourceManager.java:91)
> at
> org.apache.maven.plugin.checkstyle.DefaultCheckstyleExecutor.getOverridingProperties(DefaultCheckstyleExecutor.java:460)
> at
> org.apache.maven.plugin.checkstyle.DefaultCheckstyleExecutor.getConfiguration(DefaultCheckstyleExecutor.java:299)
> at
> org.apache.maven.plugin.checkstyle.DefaultCheckstyleExecutor.executeCheckstyle(DefaultCheckstyleExecutor.java:185)
> at
> org.apache.maven.plugin.checkstyle.AbstractCheckstyleReport.executeReport(AbstractCheckstyleReport.java:488)
> at
> org.apache.maven.plugin.checkstyle.CheckstyleReport.executeReport(CheckstyleReport.java:156)
> at
> org.apache.maven.reporting.AbstractMavenReport.generate(AbstractMavenReport.java:196)
> at
> org.apache.maven.reporting.AbstractMavenReport.execute(AbstractMavenReport.java:104)
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:106)
> ... 12 more
> {noformat}
> The underlying problem appears to be within plexus resources and I have
> opened an issue and submitted a possible fix:
> http://jira.codehaus.org/browse/PLXCOMP-237
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