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https://issues.apache.org/jira/browse/MNG-8148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17854145#comment-17854145
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Tamas Cservenak commented on MNG-8148:
--------------------------------------
Any chance to get some reproducer for this? Am getting curious...
> DefaultProjectDependenciesResolver takes up to several minutes for some
> modules of the project
> ----------------------------------------------------------------------------------------------
>
> Key: MNG-8148
> URL: https://issues.apache.org/jira/browse/MNG-8148
> Project: Maven
> Issue Type: Bug
> Reporter: Sergey Nuyanzin
> Priority: Major
>
> The project is relatively small (5 modules and maybe about 1k classes in
> total)
> unfortunately it is private so I couldn't share the source
> 1 thing that may be makes sense to mention is that some modules generates
> code for protobuf integration.
> also I was able to take thread dump of maven build
> and this is the thing which I faced. most of the times when the build was
> hanging
> {noformat}
> "main" #1 prio=5 os_prio=31 cpu=394695.18ms elapsed=448.93s
> tid=0x000000015d80a800 nid=0x2403 runnable [0x000000016dec4000]
> java.lang.Thread.State: RUNNABLE
> at
> org.eclipse.aether.util.graph.transformer.ConflictMarker.analyze(ConflictMarker.java:133)
> at
> org.eclipse.aether.util.graph.transformer.ConflictMarker.analyze(ConflictMarker.java:133)
> at
> org.eclipse.aether.util.graph.transformer.ConflictMarker.analyze(ConflictMarker.java:133)
> at
> org.eclipse.aether.util.graph.transformer.ConflictMarker.analyze(ConflictMarker.java:133)
> at
> org.eclipse.aether.util.graph.transformer.ConflictMarker.analyze(ConflictMarker.java:133)
> at
> org.eclipse.aether.util.graph.transformer.ConflictMarker.transformGraph(ConflictMarker.java:63)
> at
> org.eclipse.aether.util.graph.transformer.ConflictIdSorter.transformGraph(ConflictIdSorter.java:58)
> at
> org.eclipse.aether.util.graph.transformer.ConflictResolver.transformGraph(ConflictResolver.java:172)
> at
> org.eclipse.aether.util.graph.transformer.ChainedDependencyGraphTransformer.transformGraph(ChainedDependencyGraphTransformer.java:71)
> at
> org.eclipse.aether.internal.impl.collect.DependencyCollectorDelegate.collectDependencies(DependencyCollectorDelegate.java:246)
> at
> org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.collectDependencies(DefaultDependencyCollector.java:87)
> at
> org.eclipse.aether.internal.impl.DefaultRepositorySystem.collectDependencies(DefaultRepositorySystem.java:306)
> at
> org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:151)
> at
> org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies(LifecycleDependencyResolver.java:224)
> at
> org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resolveProjectDependencies(LifecycleDependencyResolver.java:136)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAreResolved(MojoExecutor.java:355)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.doExecute(MojoExecutor.java:313)
> {noformat}
> and
> {noformat}
> "main" #1 prio=5 os_prio=31 cpu=456718.35ms elapsed=518.34s
> tid=0x0000000127811000 nid=0x2403 runnable [0x000000016b3ac000]
> java.lang.Thread.State: RUNNABLE
> at java.util.HashMap.hash(java.base@11.0.23/HashMap.java:340)
> at java.util.LinkedHashMap.get(java.base@11.0.23/LinkedHashMap.java:440)
> at
> org.eclipse.aether.util.graph.transformer.ConflictIdSorter.buildConflitIdDAG(ConflictIdSorter.java:110)
> at
> org.eclipse.aether.util.graph.transformer.ConflictIdSorter.buildConflitIdDAG(ConflictIdSorter.java:122)
> at
> org.eclipse.aether.util.graph.transformer.ConflictIdSorter.buildConflitIdDAG(ConflictIdSorter.java:122)
> at
> org.eclipse.aether.util.graph.transformer.ConflictIdSorter.buildConflitIdDAG(ConflictIdSorter.java:122)
> at
> org.eclipse.aether.util.graph.transformer.ConflictIdSorter.transformGraph(ConflictIdSorter.java:78)
> at
> org.eclipse.aether.util.graph.transformer.ConflictResolver.transformGraph(ConflictResolver.java:172)
> at
> org.eclipse.aether.util.graph.transformer.ChainedDependencyGraphTransformer.transformGraph(ChainedDependencyGraphTransformer.java:71)
> at
> org.eclipse.aether.internal.impl.collect.DependencyCollectorDelegate.collectDependencies(DependencyCollectorDelegate.java:246)
> at
> org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.collectDependencies(DefaultDependencyCollector.java:87)
> at
> org.eclipse.aether.internal.impl.DefaultRepositorySystem.collectDependencies(DefaultRepositorySystem.java:306)
> at
> org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:151)
> at
> org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies(LifecycleDependencyResolver.java:224)
> at
> org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resolveProjectDependencies(LifecycleDependencyResolver.java:136)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAreResolved(MojoExecutor.java:355)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.doExecute(MojoExecutor.java:313)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:174)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.access$000(MojoExecutor.java:75)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor$1.run(MojoExecutor.java:162)
> at
> org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute(DefaultMojosExecutionStrategy.java:39)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:159)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:105)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:73)
> at
> org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:53)
> at
> org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:118)
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:261)
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:173)
> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:101)
> at org.apache.maven.cli.MavenCli.execute(MavenCli.java:906)
> at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:283)
> at org.apache.maven.cli.MavenCli.main(MavenCli.java:206)
> at
> jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@11.0.23/Native
> Method)
> at
> jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@11.0.23/NativeMethodAccessorImpl.java:62)
> at
> jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@11.0.23/DelegatingMethodAccessorImpl.java:43)
> {noformat}
> any hints what to do to find the root cause would be welcome
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