[MANT-52] NullPointerException when maven-javadoc-plugin configuration defines multiple group elements within a groups list element.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1
• Fix Version/s: 2.2
• Environment: $ mvn --version; Maven version: 2.0.10; Java version: 1.6.0_0; OS name: "linux" version: "2.6.29-gentoo-r3" arch: "amd64" Family: "unix"
• Flags: Patch
• Assignee: Benjamin Bentmann
• Reporter: Alistair Bush
• Created: 15/Jun/09 07:17
• Updated: 05/Apr/15 14:44
• Resolved: 25/Jun/09 11:49

Description

When attempting to run mvn ant:ant on sesame-2.2.4 available here [1]. A NullPointerException is raised. [2] for build log segment.

It seems that when a pom ( or a parents pom ) defines the following configuration the existing code the error was occuring. I have assumed in my patch that this is the only valid way of defining groups. But at least the fix is small and easy for you to figure out.

<reporting>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-javadoc-plugin</artifactId>
      <configuration>
        <aggregate>true</aggregate>
        <source>1.5</source>
        <groups>
          <group>
            <title>Repository API</title>
            <packages>org.openrdf.repository*</packages>
          </group>
          <group>
            <title>RDF Model API</title>
            <packages>org.openrdf.model*</packages>
          </group>
          ...
          ...
        </groups>
        <links>
          <link>http://java.sun.com/j2se/1.5.0/docs/api/</link>
          <link>http://repository.aduna-software.org/docs/info.aduna/api/</link>
        </links>
      </configuration>

[1] svn co http://repo.aduna-software.org/svn/org.openrdf/sesame/tags/2.2.4/

[2]

[INFO] Building OpenRDF Sesame Core                                            
[INFO]    task-segment: [ant:ant]                                              
[INFO] ------------------------------------------------------------------------
[INFO] [ant:ant]                                                               
[INFO] Wrote Ant project for sesame-core to /home/alistair/gentoo/tmp/sesame-2.2.4/core
[INFO] ------------------------------------------------------------------------        
[INFO] Building OpenRDF Sesame: Model                                                  
[INFO]    task-segment: [ant:ant]                                                      
[INFO] ------------------------------------------------------------------------        
[INFO] [ant:ant]                                                                       
[INFO] ------------------------------------------------------------------------        
[ERROR] FATAL ERROR                                                                    
[INFO] ------------------------------------------------------------------------        
[INFO] null                                                                            
[INFO] ------------------------------------------------------------------------        
[INFO] Trace                                                                           
java.lang.NullPointerException
        at org.codehaus.plexus.util.xml.PrettyPrintXMLWriter.escapeXml(PrettyPrintXMLWriter.java:151)
        at org.codehaus.plexus.util.xml.PrettyPrintXMLWriter.escapeXmlAttribute(PrettyPrintXMLWriter.java:166)
        at org.codehaus.plexus.util.xml.PrettyPrintXMLWriter.addAttribute(PrettyPrintXMLWriter.java:190)
        at org.apache.maven.plugin.ant.AntBuildWriterUtil.writeJavadocTask(AntBuildWriterUtil.java:473)
        at org.apache.maven.plugin.ant.AntBuildWriter.writeJavadocTarget(AntBuildWriter.java:991)
        at org.apache.maven.plugin.ant.AntBuildWriter.writeGeneratedBuildXml(AntBuildWriter.java:304)
        at org.apache.maven.plugin.ant.AntBuildWriter.writeBuildXmls(AntBuildWriter.java:113)
        at org.apache.maven.plugin.ant.AntMojo.execute(AntMojo.java:112)
        at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:453)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:559)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:513)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:483)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:331)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:292)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:142)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:301)
        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:616)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3 seconds
[INFO] Finished at: Tue Jun 16 00:03:36 NZST 2009
[INFO] Final Memory: 19M/184M
[INFO] ------------------------------------------------------------------------