Hi, 

You will find the following explanation on 

http://jakarta.apache.org/commons/logging/commons-logging-1.0.4/docs/guide.html#Why%20%22xxxLogger%20does%20not%20implement%20Log%22?

anonymous wrote : 
  | 
  | Why "xxxLogger does not implement Log"?
  | 
  | Upon application startup (especially in a container environment), an 
exception is thrown with message 'xxxLogger does not implement Log'! What's the 
cause and how can I fix this problem?
  | 
  | This almost always a classloader issue. Log has been loaded by a different 
classloader from the logging implementation. Please ensure that:
  | 
  |     * all the logging classes (both Log and the logging implementations) 
are deployed by the same classloader
  | 
  |     * there is only copy of the classes to be found within the classloader 
hierarchy. In application container environments this means ensuring that if 
the classes are found in a parent classloader, they are not also present in the 
leaf classloader associated with the application. So, if the jar is deployed 
within the root classloader of the container then it should be removed from the 
application's library.


Best regards
moerker

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http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3867423#3867423

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