Have you seen this: http://wiki.apache.org/myfaces/Handling_Server_Errors
for disable error handling do this:
<!-- if you want to disable the behaviour completely -->
<context-param>
<param-name>org.apache.myfaces.ERROR_HANDLING</param-name>
<param-value>false</param-value>
</context-param>
<!-- if you are using myfaces + facelets don't forget to do this -->
<context-param>
<param-name>facelets.DEVELOPMENT</param-name>
<param-value>false</param-value>
</context-param>
regards
Leonardo Uribe
