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https://issues.apache.org/jira/browse/MSHARED-1050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17514951#comment-17514951
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Karl Heinz Marbaise commented on MSHARED-1050:
----------------------------------------------
First recommendation is to upgrade maven-resources-plugin to the most recent
one 3.2.0...
> ConcurrentModificationException for maven-filtering
> ----------------------------------------------------
>
> Key: MSHARED-1050
> URL: https://issues.apache.org/jira/browse/MSHARED-1050
> Project: Maven Shared Components
> Issue Type: Bug
> Components: maven-filtering
> Reporter: Ladislav Lencucha
> Priority: Major
>
> Maven filtering is not thread safe. Adding all properties from request maven
> session results in ConcurrentModificationException.
> Problem is line 117 (and possibly also 118):
> [https://github.com/apache/maven-filtering/blob/maven-filtering-3.1.1/src/main/java/org/apache/maven/shared/filtering/BaseFilter.java]
> *How to simulate:*
> # use maven-resources-plugin which relies on maven-filtering
> ## maven-resources-plugin version 3.1.0
> ## maven-filtering version 3.1.1
> # have multithreaded build (e.g. mvn package -T 48)
> # problem does not happen all the time, but more threads improve the chances
> *JDK*
> Oracle JDK 1.8
> *Possible cause:*
> I have no clue, everything seems to be synchronized. Maybe the collection is
> being added to itself and that is why synchronized set wrapper did not work?
> *Sample stacktrace of failed build:*
> {code:java}
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
> goal org.apache.maven.plugins:maven-resources-plugin:3.1.0:resources
> (default-resources) on project sample-projct: Execution default-resources of
> goal org.apache.maven.plugins:maven-resources-plugin:3.1.0:resources failed.
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:215)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:156)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:148)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
> (LifecycleModuleBuilder.java:117)
> at
> org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call
> (MultiThreadedBuilder.java:196)
> at
> org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call
> (MultiThreadedBuilder.java:186)
> at java.util.concurrent.FutureTask.run (FutureTask.java:266)
> at java.util.concurrent.Executors$RunnableAdapter.call
> (Executors.java:511)
> at java.util.concurrent.FutureTask.run (FutureTask.java:266)
> at java.util.concurrent.ThreadPoolExecutor.runWorker
> (ThreadPoolExecutor.java:1149)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run
> (ThreadPoolExecutor.java:624)
> at java.lang.Thread.run (Thread.java:748)
> Caused by: org.apache.maven.plugin.PluginExecutionException: Execution
> default-resources of goal
> org.apache.maven.plugins:maven-resources-plugin:3.1.0:resources failed.
> at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo
> (DefaultBuildPluginManager.java:148)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:210)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:156)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:148)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
> (LifecycleModuleBuilder.java:117)
> at
> org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call
> (MultiThreadedBuilder.java:196)
> at
> org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call
> (MultiThreadedBuilder.java:186)
> at java.util.concurrent.FutureTask.run (FutureTask.java:266)
> at java.util.concurrent.Executors$RunnableAdapter.call
> (Executors.java:511)
> at java.util.concurrent.FutureTask.run (FutureTask.java:266)
> at java.util.concurrent.ThreadPoolExecutor.runWorker
> (ThreadPoolExecutor.java:1149)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run
> (ThreadPoolExecutor.java:624)
> at java.lang.Thread.run (Thread.java:748)
> Caused by: java.util.ConcurrentModificationException
> at java.util.Hashtable$Enumerator.next (Hashtable.java:1387)
> at java.util.Hashtable.putAll (Hashtable.java:523)
> at org.apache.maven.shared.filtering.BaseFilter.getDefaultFilterWrappers
> (BaseFilter.java:117)
> at
> org.apache.maven.shared.filtering.DefaultMavenFileFilter.getDefaultFilterWrappers
> (DefaultMavenFileFilter.java:53)
> at
> org.apache.maven.shared.filtering.DefaultMavenResourcesFiltering.handleDefaultFilterWrappers
> (DefaultMavenResourcesFiltering.java:269)
> at
> org.apache.maven.shared.filtering.DefaultMavenResourcesFiltering.filterResources
> (DefaultMavenResourcesFiltering.java:132)
> at org.apache.maven.plugins.resources.ResourcesMojo.execute
> (ResourcesMojo.java:345)
> at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo
> (DefaultBuildPluginManager.java:137)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:210)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:156)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:148)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
> (LifecycleModuleBuilder.java:117)
> at
> org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call
> (MultiThreadedBuilder.java:196)
> at
> org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call
> (MultiThreadedBuilder.java:186)
> at java.util.concurrent.FutureTask.run (FutureTask.java:266)
> at java.util.concurrent.Executors$RunnableAdapter.call
> (Executors.java:511)
> at java.util.concurrent.FutureTask.run (FutureTask.java:266)
> at java.util.concurrent.ThreadPoolExecutor.runWorker
> (ThreadPoolExecutor.java:1149)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run
> (ThreadPoolExecutor.java:624)
> at java.lang.Thread.run (Thread.java:748){code}
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