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https://issues.apache.org/jira/browse/MENFORCER-314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16741971#comment-16741971
]
Falko Modler commented on MENFORCER-314:
----------------------------------------
After running some weeks with a custom build of the plugin incorporating PR
#44, the problem finally struck and the output now reveals the underlying cause:
{noformat}
11:13:47 [WARNING] Rule 4:
org.apache.maven.plugins.enforcer.DependencyConvergence failed with message:
11:13:47 org.apache.maven.enforcer.rule.api.EnforcerRuleException
11:13:47 at
org.apache.maven.plugins.enforcer.DependencyConvergence.execute(DependencyConvergence.java:132)
11:13:47 at
org.apache.maven.plugins.enforcer.EnforceMojo.execute(EnforceMojo.java:204)
11:13:47 at
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
11:13:47 at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
11:13:47 at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
11:13:47 at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
11:13:47 at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
11:13:47 at
org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:185)
11:13:47 at
org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:181)
11:13:47 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
11:13:47 at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
11:13:47 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
11:13:47 at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
11:13:47 at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
11:13:47 at java.lang.Thread.run(Thread.java:748)
11:13:47 Caused by: java.lang.NullPointerException
11:13:47 at java.util.Hashtable.put(Hashtable.java:460)
11:13:47 at
org.apache.maven.properties.internal.SystemProperties.addSystemProperties(SystemProperties.java:38)
11:13:47 at
org.apache.maven.project.artifact.MavenMetadataSource.getSystemProperties(MavenMetadataSource.java:756)
11:13:47 at
org.apache.maven.project.artifact.MavenMetadataSource.retrieveRelocatedProject(MavenMetadataSource.java:574)
11:13:47 at
org.apache.maven.project.artifact.MavenMetadataSource.retrieve(MavenMetadataSource.java:190)
11:13:47 at
org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.recurse(DefaultLegacyArtifactCollector.java:532)
11:13:47 at
org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.recurse(DefaultLegacyArtifactCollector.java:584)
11:13:47 at
org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.recurse(DefaultLegacyArtifactCollector.java:584)
11:13:47 at
org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.recurse(DefaultLegacyArtifactCollector.java:584)
11:13:47 at
org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.recurse(DefaultLegacyArtifactCollector.java:584)
11:13:47 at
org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.recurse(DefaultLegacyArtifactCollector.java:584)
11:13:47 at
org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.collect(DefaultLegacyArtifactCollector.java:144)
11:13:47 at
org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.collect(DefaultLegacyArtifactCollector.java:100)
11:13:47 at
org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.collect(DefaultLegacyArtifactCollector.java:782)
11:13:47 at
org.apache.maven.shared.dependency.tree.DefaultDependencyTreeBuilder.buildDependencyTree(DefaultDependencyTreeBuilder.java:118)
11:13:47 at
org.apache.maven.plugins.enforcer.DependencyConvergence.getNode(DependencyConvergence.java:86)
11:13:47 at
org.apache.maven.plugins.enforcer.DependencyConvergence.execute(DependencyConvergence.java:114)
11:13:47 ... 14 more
{noformat}
So in this case it was MNG-6105 (we are still on Maven 3.3.9).
> DependencyConvergence fails sporadically with a null message
> ------------------------------------------------------------
>
> Key: MENFORCER-314
> URL: https://issues.apache.org/jira/browse/MENFORCER-314
> Project: Maven Enforcer Plugin
> Issue Type: Bug
> Components: Standard Rules
> Affects Versions: 1.4.1, 3.0.0-M1
> Environment: Apache Maven 3.3.9
> (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T17:41:47+01:00)
> Java version: 1.8.0_162, vendor: Oracle Corporation
> Reporter: Falko Modler
> Priority: Major
> Fix For: 3.0.0
>
>
> Our Jenkins builds fail sporadically without providing a message:
> {noformat}
> 17:08:28 [WARNING] Rule 4:
> org.apache.maven.plugins.enforcer.DependencyConvergence failed with message:
> 17:08:28 null
> {noformat}
> Looking at the code, I suspect that this can happen [on line 132 of the
> rule|https://github.com/apache/maven-enforcer/blob/enforcer-3.0.0-M2/enforcer-rules/src/main/java/org/apache/maven/plugins/enforcer/DependencyConvergence.java#L132]
> when some underlying exception is caught which itself does not provide a
> (localized) message.
> As the plugin [does not include the
> cause|https://github.com/apache/maven-enforcer/blob/enforcer-3.0.0-M2/maven-enforcer-plugin/src/main/java/org/apache/maven/plugins/enforcer/EnforceMojo.java#L212]
> (unless {{failFast}} is set), you will just see a null message.
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