I've been trying to build my own plugin using an Ant mojo, and when I
attempt to load it up into maven, I'm getting a null pointer exception.
How does one go about debugging this to determine where I've made a
mistake in the plugin?
This is all being driven in a move to convert a pre-ant build mechanism
up to Maven. Should I consider just bagging the plugin and pushing this
into the POM with an Ant task?
[INFO] Scanning for projects...
[INFO]
------------------------------------------------------------------------
----
[INFO] Building tea
[INFO] task-segment: [clean, package]
[INFO]
------------------------------------------------------------------------
----
[INFO] artifact WDIG:wdig-beandoc-plugin: checking for updates from
central
[INFO]
------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO]
------------------------------------------------------------------------
[INFO] null
[INFO]
------------------------------------------------------------------------
[INFO] Trace
java.lang.NullPointerException
at
org.apache.maven.plugin.DefaultPluginManager.addPlugin(DefaultPluginMana
ger.java:292)
at
org.apache.maven.plugin.DefaultPluginManager.verifyVersionedPlugin(Defau
ltPluginManager.java:198)
at
org.apache.maven.plugin.DefaultPluginManager.verifyPlugin(DefaultPluginM
anager.java:163)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.verifyPlugin(Default
LifecycleExecutor.java:1252)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.bindPluginToLifecycl
e(DefaultLifecycleExecutor.java:1216)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.constructLifecycleMa
ppings(DefaultLifecycleExecutor.java:
982)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultL
ifecycleExecutor.java:453)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandle
Failures(DefaultLifecycleExecutor.jav
a:306)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(
DefaultLifecycleExecutor.java:273)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifec
ycleExecutor.java:140)
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:256)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
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: 2 seconds
[INFO] Finished at: Thu Jun 29 08:40:54 PDT 2006
[INFO] Final Memory: 1M/4M
[INFO]
------------------------------------------------------------------------
-joe
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