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https://issues.apache.org/jira/browse/MENFORCER-314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16666137#comment-16666137
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Falko Modler commented on MENFORCER-314:
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I've sent to PRs to improve output for such a case to figure out what is going
on.
> 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
> 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
>
> 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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