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http://jira.codehaus.org/browse/MNG-3920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=162787#action_162787
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Brett Porter commented on MNG-3920:
-----------------------------------
You need to add this to your plexus-velocity dependency:
<exclusions>
<exclusion>
<groupId>org.codehaus.plexus</groupId>
<artifactId>plexus-component-api</artifactId>
</exclusion>
</exclusions>
This is because it clashes with the plexus-container-default in Maven so it
uses the wrong Initializable (and LogEnabled) classes.
While not technically a bug in Maven, we could work around this by adding
another exclusion. I think we should consider this for 2.0.11.
> Problem using velocity component
> --------------------------------
>
> Key: MNG-3920
> URL: http://jira.codehaus.org/browse/MNG-3920
> Project: Maven 2
> Issue Type: Bug
> Components: Plugins and Lifecycle
> Affects Versions: 2.1.0-M1
> Reporter: Alfie Kirkpatrick
> Fix For: 2.0.11, 2.1.0-M2
>
> Attachments: pom.xml, swfclipse.zip
>
>
> Jason van Zyl asked me to raise this here so he could take a look. Not
> convinced it is a genuine bug...
> I am attempting to write a plugin that uses Velocity to template
> some config files. I have been developing the plugin using m2eclipse
> embedded maven runtime and it works fine. But it gives a NPE when I run
> it in maven standalone, even with the 2.1M1 release.
> I have the following in my class:
> /**
> * @component
> */
> protected VelocityComponent velocityComponent;
> The line giving the NPE is:
> Template template =
> velocityComponent.getEngine().getTemplate("/"+templateName+".vm");
> When running standalone the velocityComponent is initialised with a
> DefaultVelocityComponent but with a null engine, so getTemplate gives
> the NPE.
> Am struggling to understand if I'm doing this correctly and why it
> should work in maven embedder (in m2eclipse) but not standalone?
> As an aside, my class implements org.codehaus.plexus.logging.LogEnabled and
> running with maven embedder, the enableLogging method is called with a
> PlexusLoggerAdapter, but running standalone this method is not called. Can't
> help feeling this is related...
> I have made use of a class from the eclipse plugin project and have a
> dependency on other eclipse plugin support classes. This is a mojo to
> generate project files for FlexBuilder and I ultimately want to contribute
> this to the flex-mojos project.
> Thanks again.
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