[MNG-6636] NPE on reporting convertion (DefaultReportingConverter) when inheritance of with no reports

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.6.1
• Fix Version/s: 3.6.2
• Component/s: Inheritance and Interpolation
• Assignee: Herve Boutemy
• Reporter: Herve Boutemy
• Created: 12/Apr/19 17:03
• Updated: 28/Mar/20 15:04
• Resolved: 28/Apr/19 20:28

Description

when launching Maven on maven-site:

$ mvn clean
[INFO] Scanning for projects...
[ERROR] Internal error: java.lang.NullPointerException -> [Help 1]
org.apache.maven.InternalErrorException: Internal error: java.lang.NullPointerException
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:120)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:606)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
Caused by: java.lang.NullPointerException
    at org.apache.maven.model.plugin.DefaultReportingConverter.convert (DefaultReportingConverter.java:243)
    at org.apache.maven.model.plugin.DefaultReportingConverter.convert (DefaultReportingConverter.java:213)
    at org.apache.maven.model.plugin.DefaultReportingConverter.convertReporting (DefaultReportingConverter.java:140)
    at org.apache.maven.model.building.DefaultModelBuilder.build (DefaultModelBuilder.java:479)
    at org.apache.maven.model.building.DefaultModelBuilder.build (DefaultModelBuilder.java:432)
    at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:616)

caused by the fact that there is no <reports></reports> elements in following reportSet:

  <reporting>
    <excludeDefaults>true</excludeDefaults>
    <outputDirectory>${site.output}</outputDirectory>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-project-info-reports-plugin</artifactId>
        <reportSets>
          <reportSet><!-- don't execute inherited reports, since some are useless and cannot be removed -->
            <configuration>
              <skip>true</skip>
            </configuration>
          </reportSet>

Issue Links

• is caused by: MNG-6601 add input location tracking for site's reportPlugins injected by reports conversion
• is duplicated by: MNG-6637 NPE while trying to build Maven Site
• is related to: MNG-6644 NPE in DefaultReportingConverter when reports has no InputLocation (using polyglot Maven)
• is related to: MNG-6647 NPE in DefaultReportingConverter (when reports injected by Repaint IO maven-tiles)