Try with -U -up paramters when launching maven.
It should update / download the needed plugins.

On 9/1/06, Sergey Elin <elinsn@gmail.com> wrote:
>
> Here is another build error reproduced on both my boxes (Windows and UNIX)
> since this morning:
>
> Downloading: http://mirrors.sunsite.dk/maven2/org/apache/maven/plugins/maven-jar
>
> -plugin/2.1/maven-jar-plugin-2.1.pom
> [WARNING] Unable to get resource from repository central (
> http://repo1.maven.org
> /maven2)
> [INFO]
> ------------------------------------------------------------------------
> [ERROR] BUILD ERROR
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Failed to resolve artifact.
>
> GroupId: org.apache.maven.plugins
> ArtifactId: maven-jar-plugin
> Version: 2.1
>
> Reason: Unable to download the artifact from any repository
>
>   org.apache.maven.plugins:maven-jar-plugin:pom:2.1
>
> from the specified remote repositories:
>   central ( http://repo1.maven.org/maven2),
>   apache.snapshots (http://people.apache.org/maven-snapshot-repository),
>   codehaus ( http://repository.codehaus.org),
>   apache-snapshots (http://people.apache.org/repo/m2-snapshot-repository),
>   codehaus-snapshots ( http://snapshots.repository.codehaus.org)
>
>
> [INFO]
> ------------------------------------------------------------------------
> [INFO] For more information, run Maven with the -e switch
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Total time: 38 seconds
> [INFO] Finished at: Fri Sep 01 11:12:08 MSD 2006
> [INFO] Final Memory: 25M/46M
> [INFO]
> ------------------------------------------------------------------------
>
> Any suggessions? =(
>
>


-- 
Cheers,
Guillaume Nodet