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From "Brett Porter (JIRA)" <j...@codehaus.org>
Subject [jira] Closed: (MNG-2242) mvn command gives a Null Pointer Exception when a plugin is invalid
Date Fri, 15 Jun 2007 14:23:58 GMT

     [ http://jira.codehaus.org/browse/MNG-2242?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Brett Porter closed MNG-2242.
-----------------------------

         Assignee: Brett Porter
       Resolution: Cannot Reproduce
    Fix Version/s:     (was: 2.1.x)

now gives a better error (plugin descriptor can not be found)

> mvn command gives a Null Pointer Exception when a plugin is invalid
> -------------------------------------------------------------------
>
>                 Key: MNG-2242
>                 URL: http://jira.codehaus.org/browse/MNG-2242
>             Project: Maven 2
>          Issue Type: Bug
>         Environment: Windows XP, Mavne 2.0.2
>            Reporter: Kin Leung
>            Assignee: Brett Porter
>         Attachments: pom.xml
>
>
> I tried to use xdoclet with Maven 2.0.2 by adding those lines in pom.xml:
>   <build>
>     <finalName>bookstore-web</finalName>
>     <plugins>
>        <plugin>
>          <groupId>xdoclet</groupId>
>          <artifactId>maven-xdoclet-plugin</artifactId>
>          <version>1.2</version>
>          <executions>
> 	      <execution>
> 	        <id>generate-deployment-decriptor</id>
> 	        <phase>generate-sources</phase>
> 	        <configuration>
> 	          <fileset dir="src/main/java">
> 	            <include name="**/*.java"/>
> 	          </fileset> 
> 	          <webdoclet>
> 	             <destinationFile>web.xml</destinationFile>
> 	             <destDir>src/main/webapp/WEB-INF</destDir>
> 	          </webdoclet>
> 	         </configuration>
> 	        <goals>
> 	          <goal>webdoclet</goal>
> 	        </goals>
> 	      </execution>
> 	    </executions>
>       </plugin>
>      </plugins>
> After I saved the file and run mvn (mvn install and mvn clean), it gives me Null Pointer
Exception:
> Downloading: http://repo1.maven.org/maven2/xdoclet/maven-xdoclet-plugin/1.2/mave
> n-xdoclet-plugin-1.2.pom
> 159b downloaded
> Downloading: http://repo1.maven.org/maven2/xdoclet/maven-xdoclet-plugin/1.2/mave
> n-xdoclet-plugin-1.2.jar
> 34K downloaded
> [INFO] -------------------------------------------------------------------------
> ---
> [ERROR] FATAL ERROR
> [INFO] -------------------------------------------------------------------------
> ---
> [INFO] null
> [INFO] -------------------------------------------------------------------------
> ---
> [INFO] Trace
> java.lang.NullPointerException
>         at org.apache.maven.plugin.DefaultPluginManager.addPlugin(DefaultPluginM
> anager.java:295)
>         at org.apache.maven.plugin.DefaultPluginManager.verifyVersionedPlugin(De
> faultPluginManager.java:200)
>         at org.apache.maven.plugin.DefaultPluginManager.verifyPlugin(DefaultPlug
> inManager.java:165)
>         at org.apache.maven.lifecycle.DefaultLifecycleExecutor.verifyPlugin(Defa
> ultLifecycleExecutor.java:1218)
>         at org.apache.maven.lifecycle.DefaultLifecycleExecutor.bindPluginToLifec
> ycle(DefaultLifecycleExecutor.java:1182)
>         at org.apache.maven.lifecycle.DefaultLifecycleExecutor.constructLifecycl
> eMappings(DefaultLifecycleExecutor.java:950)
>         at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(Defau
> ltLifecycleExecutor.java:450)
>         at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHan
> dleFailures(DefaultLifecycleExecutor.java:303)
>         at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegmen
> ts(DefaultLifecycleExecutor.java:270)
>         at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLi
> fecycleExecutor.java:139)
>         at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:322)
>         at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:115)
>         at org.apache.maven.cli.MavenCli.main(MavenCli.java:249)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
> java:39)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
> sorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:585)
>         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] -------------------------------------------------------------------------
> ---
> Looks like something is screwed up when maven attempts to run the plugin for generating
the web.xml of my servlet.  I didn't do anything on the settings.xml, does that matter?
> Also the documentation is por and in worse case the poor documentation offsets the benefits
of the tool.

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