Chris,
   there is no real overhead in the existence of the valve and is necessary 
(not just for identity propogation but also to associate the 
SecurityAssociation info with the request thread).

TomcatDeployer.java :-

  | /* Add security association valve after the authorization
  |       valves so that the authenticated user may be associated with the
  |       request thread/session.
  |       */
  |       SecurityAssociationValve valve = new 
SecurityAssociationValve(metaData,
  |          config.getSecurityManagerService());
  |       valve.setSubjectAttributeName(config.getSubjectAttributeName());
  |       server.invoke(objectName, "addValve",
  |          new Object[]{valve},
  |          new String[]{"org.apache.catalina.Valve"});
  | 

Moral: This valve is a JBoss internal valve and should not be removed. :-)



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