[ http://jira.codehaus.org/browse/MNG-2242?page=comments#action_70530 ]
Todd Nine commented on MNG-2242:
--------------------------------
I am also receiving this error on a Maven1 plugin. However it has been wrapped
with a Maven 2 POM, and it will run at the command line. For instance, if I
execute the following command, the plugin runs successfully.
mvn clean antlr:generate
-Dgrammars=com/ata/util/validator/validwhen/ValidWhenParser.g
However if I set up the following plugin
<plugin>
<groupId>maven</groupId>
<artifactId>maven-antlr-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<goals>
<goal>generate</goal>
</goals>
<phase>generate-sources</phase>
</execution>
</executions>
<configuration>
<grammars>com/ata/util/validator/validwhen/ValidWhenParser.g</grammars>
</configuration>
</plugin>
I receive a NullPointerException. If I can run the task from the command line,
why can't I execute it as a plugin? I would really prefer to have this
generated automatically before my compile task runs.
Thanks,
Todd
Todd
> 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
> Fix For: 2.1
>
> 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.
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
http://jira.codehaus.org/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira
