[ http://jira.codehaus.org/browse/MNG-2421?page=comments#action_69262 ] 

Dennis Lundberg commented on MNG-2421:
--------------------------------------

I've done some digging and using commons-logging-1.0.4 produces this more 
usable message:
  "Invalid class loader hierarchy.  You have more than one version of 
'org.apache.commons.logging.Log' visible, which is not allowed."

This seems to indicate a problem with the class loader hierarchy. Updating to 
commons-logging-1.1 solves this. That release of commons-logging had many fixes 
to class loading issues. Unless anyone thinks it is bad to add a dependency on 
commons-logging-1.1 I will commit the changes I have. Will leave it open for 
comments first.

> [plugins/docck] fail to run 
> "org.apache.commons.logging.LogConfigurationException: Class 
> org.apache.commons.logging.impl.Jdk14Logger does not implement Log"
> ------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>          Key: MNG-2421
>          URL: http://jira.codehaus.org/browse/MNG-2421
>      Project: Maven 2
>         Type: Bug

>   Components: Sandbox
>  Environment: maven 2.0.4
>     Reporter: Jerome Lacoste
>  Attachments: mvn.log
>
>
> This happens when I try running it on the under the 
> mojo/webstart-maven-plugin/plugin directory

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