mvn command gives a Null Pointer Exception after configuring plugins
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Key: MPLUGIN-16
URL: http://jira.codehaus.org/browse/MPLUGIN-16
Project: Maven 2.x Plugin Plugin
Type: Bug
Environment: Windows XP, Mavne 2.0.2
Reporter: Kin Leung
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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