I've got the same error when tried to use jar override for the first time.
Try to replace <artifactid/> tag with <id/>. 


> I'm trying to use the JAR over-ride feature wh/ I have enabled in the
> project.properties file.    Below is a project.xml snippet with the
> generated output.  Please tell me that I've got something obviously wrong
> in my dependency grammar.....  (My XML editor confirms that the entire
> project.xml is well-formed).  TIA
> 
>     <dependencies>
>         <dependency>
>           <groupid>java/thirdparty/lawson</groupid>
>           <artifactid>navigator</artifactid>
>           <type>jar</type>
>           <version>0.9.1</version>
>           <url>http://cvs.lawson.com/</url>
>         </dependency>
>     </dependencies>
> 
> generates the follwing output....
> 

>  __  __
> |  \/  |__ _Apache__ ___
> | |\/| / _` \ V / -_) ' \  ~ intelligent projects ~
> |_|  |_\__,_|\_/\___|_||_|  v. 1.0-beta-10
> 
> java.lang.NullPointerException
>         at
> org.apache.maven.project.Project.standardToLegacyId(Project.java:1587)
>         at
> org.apache.maven.ArtifactListBuilder.build(ArtifactListBuilder.java:95)
>         at
> org.apache.maven.project.Project.buildArtifactList(Project.java:1469)
>         at org.apache.maven.project.Project.initialize(Project.java:1292)
>         at org.apache.maven.MavenUtils.getProject(MavenUtils.java:249)


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