I've continued struggling with this, not sure whether this represents
progress or not, but am now getting this exception when i run mvn install:

[INFO]
------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO]
------------------------------------------------------------------------
[INFO] Internal error in the plugin manager executing goal
'org.apache.maven.plugins:maven-jar-plugin
:2.1-SNAPSHOT:jar': Unable to find the mojo
'org.apache.maven.plugins:maven-jar-plugin:2.1-SNAPSHOT:j
ar' in the plugin 'org.apache.maven.plugins:maven-jar-plugin'
org/apache/maven/archiver/MavenArchiveConfiguration
[INFO]
------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: Internal error in
the plugin manager executin
g goal 'org.apache.maven.plugins:maven-jar-plugin:2.1-SNAPSHOT:jar': Unable
to find the mojo 'org.apa
che.maven.plugins:maven-jar-plugin:2.1-SNAPSHOT:jar' in the plugin
'org.apache.maven.plugins:maven-ja
r-plugin'
        at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.
java:538)
        at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecy
cleExecutor.java:475)
        at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.j
ava:454)
        at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLi
fecycleExecutor.java:306)
        at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleEx
ecutor.java:273)
        at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.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.java:39)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.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)
Caused by: org.apache.maven.plugin.PluginManagerException: Unable to find
the mojo 'org.apache.maven.
plugins:maven-jar-plugin:2.1-SNAPSHOT:jar' in the plugin
'org.apache.maven.plugins:maven-jar-plugin'
        at
org.apache.maven.plugin.DefaultPluginManager.getConfiguredMojo(DefaultPluginManager.java:5
33)
        at
org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:390)
        at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.
java:534)
        ... 16 more
Caused by:
org.codehaus.plexus.component.repository.exception.ComponentLookupException:
Unable to loo
kup component
'org.apache.maven.plugin.Mojoorg.apache.maven.plugins:maven-jar-plugin:2.1-SNAPSHOT:jar
', it could not be created
        at
org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:335)
        at
org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:312)
        at
org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:440)
        at
org.apache.maven.plugin.DefaultPluginManager.getConfiguredMojo(DefaultPluginManager.java:5
24)
        ... 18 more
Caused by:
org.codehaus.plexus.component.factory.ComponentInstantiationException: Could
not instancia
te component: role: 'null', implementation:
'org.apache.maven.plugin.jar.JarMojo'
        at
org.codehaus.plexus.component.factory.java.JavaComponentFactory.makeException(JavaComponen
tFactory.java:77)
        at
org.codehaus.plexus.component.factory.java.JavaComponentFactory.newInstance(JavaComponentF
actory.java:62)
        at
org.codehaus.plexus.DefaultPlexusContainer.createComponentInstance(DefaultPlexusContainer.
java:1464)
        at
org.codehaus.plexus.component.manager.AbstractComponentManager.createComponentInstance(Abs
tractComponentManager.java:93)
        at
org.codehaus.plexus.component.manager.PerLookupComponentManager.getComponent(PerLookupComp
onentManager.java:48)
        at
org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:331)
        ... 21 more
Caused by: java.lang.NoClassDefFoundError:
org/apache/maven/archiver/MavenArchiveConfiguration
        at
org.apache.maven.plugin.jar.AbstractJarMojo.<init>(AbstractJarMojo.java:81)
        at org.apache.maven.plugin.jar.JarMojo.<init>(JarMojo.java:30)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
        at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:3
9)
        at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImp
l.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
        at java.lang.Class.newInstance0(Class.java:350)
        at java.lang.Class.newInstance(Class.java:303)
        at
org.codehaus.plexus.component.factory.java.JavaComponentFactory.newInstance(JavaComponentF
actory.java:44)
        ... 25 more
[INFO]
------------------------------------------------------------------------
[INFO] Total time: 5 seconds
[INFO] Finished at: Tue Apr 04 16:57:03 EDT 2006
[INFO] Final Memory: 7M/13M
[INFO]
------------------------------------------------------------------------
--
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