[xwiki-users] username null

Hi there, I'm trying to authenticate using NIS, but I have a problem related to com.xpn.xwiki.user.impl.xwiki.XWikiAuthServiceImpl. Given the next code : public class NISAuthServiceImpl extends XWikiAuthServiceImpl { public Principal authenticate(String userId, String password, XWikiContext context) throws XWikiException { log.debug(DEBUG + "NIS Authenticator Improved : " + userId ); ... } authenticate is called each time a page is loaded. If no authentiction is done the userId vaue show is null, but when logging in it also is anull (and obviusly no login is performed). Any clue on how to solve this ?? TIA -- Víctor A. Rodríguez (http://www.bit-man.com.ar) El bit Fantasma (Bit-Man) - Algorithm junkie Perl Mongers Capital Federal (http://cafe.pm.org/) GNU/Linux User Group - FCEyN - UBA (http://glugcen.dc.uba.ar/