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https://issues.apache.org/jira/browse/MLINKCHECK-26?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15422730#comment-15422730
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Daniel Wegener commented on MLINKCHECK-26:
------------------------------------------
Probably the reason:
https://github.com/apache/maven-doxia-tools/blob/doxia-tools-1.2/doxia-linkcheck/src/main/java/org/apache/maven/doxia/linkcheck/LinkMatcher.java#L54
Hey, but at least we saved an object allocation! ¯\(ツ)/¯
> Linkcheck does not support parrallel builds
> -------------------------------------------
>
> Key: MLINKCHECK-26
> URL: https://issues.apache.org/jira/browse/MLINKCHECK-26
> Project: Maven Linkcheck Plugin
> Issue Type: Bug
> Reporter: Daniel Wegener
>
> Running multi-module-builds in parallel where multiple modules use the
> linkcheck plugin can trigger the following exception.
> {code}
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-linkcheck-plugin:1.2:linkcheck (run-linkcheck)
> on project foo.documentation.arc: Execution run-linkcheck of goal
> org.apache.maven.plugins:maven-linkcheck-plugin:1.2:linkcheck failed.
> ConcurrentModificationException -> [Help 1]
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
> goal org.apache.maven.plugins:maven-linkcheck-plugin:1.2:linkcheck
> (run-linkcheck) on project foo.documentation.arc: Execution run-linkcheck of
> goal org.apache.maven.plugins:maven-linkcheck-plugin:1.2:linkcheck failed.
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
> 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:116)
> at
> org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:185)
> at
> org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:181)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.maven.plugin.PluginExecutionException: Execution
> run-linkcheck of goal
> org.apache.maven.plugins:maven-linkcheck-plugin:1.2:linkcheck failed.
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
> ... 11 more
> Caused by: java.util.ConcurrentModificationException
> at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1207)
> at java.util.TreeMap$KeyIterator.next(TreeMap.java:1261)
> at
> org.apache.maven.doxia.linkcheck.DefaultLinkCheck.check(DefaultLinkCheck.java:505)
> at
> org.apache.maven.doxia.linkcheck.DefaultLinkCheck.checkFile(DefaultLinkCheck.java:447)
> at
> org.apache.maven.doxia.linkcheck.DefaultLinkCheck.findAndCheckFiles(DefaultLinkCheck.java:423)
> at
> org.apache.maven.doxia.linkcheck.DefaultLinkCheck.execute(DefaultLinkCheck.java:232)
> at
> org.apache.maven.plugins.linkcheck.LinkcheckReport.executeLinkCheck(LinkcheckReport.java:430)
> at
> org.apache.maven.plugins.linkcheck.LinkcheckReport.execute(LinkcheckReport.java:285)
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
> ... 12 more
> {code}
> Looks like the injected LinkCheck in
> https://github.com/apache/maven-plugins/blob/a3f8da79c8d050001524f7ea993c541bc4f79b0e/maven-linkcheck-plugin/src/main/java/org/apache/maven/plugins/linkcheck/LinkcheckReport.java#L74
> (which evaluates to a DefaultLinkCheck:
> https://github.com/apache/maven-doxia-tools/blob/doxia-tools-1.2/doxia-linkcheck/src/main/java/org/apache/maven/doxia/linkcheck/DefaultLinkCheck.java#L65)
> is not thread-safe.
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