DefaultPluginManager.getConfiguredMojo() doesn't handle NoClassDefFoundError
correctly
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Key: MNG-2690
URL: http://jira.codehaus.org/browse/MNG-2690
Project: Maven 2
Issue Type: Bug
Components: Plugins and Lifecycle
Affects Versions: 2.0.4
Reporter: Aaron Digulla
If maven tries to download a file which doesn't exist and it believes there is
no other place where it can get the file, you can have the situation that Maven
tries to invoke a Plugin without a complete classpath. In the log, you'll see
something like this:
Downloading:
http://repository.codehaus.org/org/codehaus/mojo/dependency-maven-plugin/1.0/dependency-maven-plugin-1.0.pom
Downloading:
http://repo1.maven.org/maven2/org/codehaus/mojo/dependency-maven-plugin/1.0/dependency-maven-plugin-1.0.jar
15K downloaded
As you can see, Maven tries to download the POM from a different site than the
JAR. Now, the classpath of the JAR is incomplete because the POM is missing.
Things get really nasty when Maven tries to access the plugin. You'll get:
java.lang.NoClassDefFoundError:
Lorg/codehaus/plexus/archiver/manager/ArchiverManager;
which tells you exactly nothing since you have no idea who wants that class.
The cause of the problem is that PlexusContainer doesn't catch errors (well,
Java says you shouldn't but the user would really like to see what's going on).
My fix was to duplicate the catch in DefaultPluginManager.getConfiguredMojo()
(around line 530):
catch ( NoClassDefFoundError e )
{
throw new PluginManagerException( "Unable to find the mojo '" +
mojoDescriptor.getRoleHint() +
"' in the plugin '" + pluginDescriptor.getPluginLookupKey() +
"' because of NoClassDefFoundError:", e );
}
This way, I get at least an idea which plugin is causing the problem.
But I guess the container should be fixed to catch these errors.
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