A required plugin was not found: Plugin could not be found

Wed, 15 Mar 2006 02:04:00 -0800 

Hi,
I'm newbie in Maven and I'm exploring this great tool. I'm using it for a personnal project but I encounter a problem that I cannot fix. I've searched on the ML and googled with no result on this problem. 

I'm using Maven 2.0.2.


I want to generate code coverage reports on the project (and some other 
like jdepend, changes, etc). I saw cobertura-maven-plugin and wanted to 
use it.
In the central repository, it seems to be working with Maven1 only. I 
get a NullPointerException that is raised which is caracteristic of 
trying to use a plugin of Maven1 with Maven2 no ? I saw some mails about 
this in the ML saying plugins were not up-to-date.



I've searched for a repository that could have the plugins I'm 
interested in for Maven2. I found one here 
(http://snapshots.maven.codehaus.org/maven2).



I then added to settings.xml a profile where I added the repository. At 
last I've  set the profile as always active.

Here is the declaration:
 <profiles>
   <profile>
     <id>additional-repository</id>

     <repositories>
       <repository>
         <id>codehaus</id>
         <name>Code Haus snapshots.</name>
         <url>http://snapshots.maven.codehaus.org/maven2</url>
         <layout>default</layout>
       </repository>
     </repositories>
   </profile>
 </profiles>

 <activeProfiles>
   <activeProfile>additional-repository</activeProfile>
 </activeProfiles>

Declaration in the pom file:
     <plugin>
       <groupId>org.codehaus.mojo</groupId>
       <artifactId>cobertura-maven-plugin</artifactId>
       <version>2.0-20060130.214008-3</version>
     </plugin>

Then I execute the command mvn site.


Maven starts to download the pom file related to the plugin and then say 
that it cannot find the plugin.

Here is the exact message:
+-+-+-+-+-+-+-+-+-+  START OF MESSAGE  +-+-+-+-+-+-+-+-+-+

[INFO] Building Common Classes
[INFO]    task-segment: [site]

[INFO] 
----------------------------------------------------------------------------
Downloading: 
http://snapshots.maven.codehaus.org/maven2/org/codehaus/mojo/cobertura-maven-plugin/2.0-SNAPSHOT/cobertura-maven-plugin-2.0-20060130.214008-3.pom

3K downloaded

[INFO] 
----------------------------------------------------------------------------

[ERROR] BUILD FAILURE

[INFO] 
----------------------------------------------------------------------------
[INFO] A required plugin was not found: Plugin could not be found - 
check that the goal name is correct: Unable to download the artifact 
from any repository



 
org.codehaus.mojo:cobertura-maven-plugin:maven-plugin:2.0-20060130.214008-3


from the specified remote repositories:
 central (http://repo1.maven.org/maven2)


 
org.codehaus.mojo:cobertura-maven-plugin:maven-plugin:2.0-20060130.214008-3


from the specified remote repositories:
 central (http://repo1.maven.org/maven2)

+-+-+-+-+-+-+-+-+-+  END OF MESSAGE  +-+-+-+-+-+-+-+-+-+


I've tried tons of things but with no success. I've search in the 
mailing list but found nothing (well for the problem else I found some 
interesting references to plugin or some fixes for other problems I 
could have).



In the FAQ there is a section that answers to this but it is not 
applying to me since I'm not behind a proxy and it was working fine 
until I want those plugins from a special repository.


So I ask for help since I cannot find a solution.

Any help would be greatly appreciated.

thanks in advance

Boris


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