[xwiki-users] ldap error - nullpointerexception - XWiki 1.7 - Tomcat 6.0.18

Hi guys, can anyone tell me, what this might be about when trying to loging via Ldap on Active directory? ---snip-- java.lang.NullPointerException at com.xpn.xwiki.user.impl.LDAP.XWikiLDAPAuthServiceImpl.authenticate(XWikiLDAPAuthServiceImpl.java:157 at com.xpn.xwiki.user.impl.xwiki.MyFormAuthenticator.authenticate(MyFormAuthenticator.java:239) at com.xpn.xwiki.user.impl.xwiki.MyFormAuthenticator.processLogin(MyFormAuthenticator.java:165) at com.xpn.xwiki.user.impl.xwiki.MyFormAuthenticator.processLogin(MyFormAuthenticator.java:148) at com.xpn.xwiki.user.impl.xwiki.XWikiAuthServiceImpl.checkAuth(XWikiAuthServiceImpl.java:203) at com.xpn.xwiki.XWiki.checkAuth(XWiki.java:3578) at com.xpn.xwiki.user.impl.xwiki.XWikiRightServiceImpl.checkAccess(XWikiRightServiceImpl.java:139) at com.xpn.xwiki.XWiki.checkAccess(XWiki.java:3586) at com.xpn.xwiki.XWiki.prepareDocuments(XWiki.java:4572) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:190) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at com.xpn.xwiki.plugin.webdav.DavFilter.doFilter(DavFilter.java:68) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:287) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:112) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619) --snap-- my ldap is configured as follows: --snip-- xwiki.authentication.authclass=com.xpn.xwiki.user.impl.LDAP.XWikiLDAPAuthServiceImpl xwiki.authentication.ldap=1 xwiki.authentication.ldap.server=dc50546 xwiki.authentication.ldap.port=389 xwiki.authentication.ldap.base_DN=ou=benutzer,dc=ruv,dc=de xwiki.authentication.ldap.bind_DN=benutzer\\{0} xwiki.authentication.ldap.bind_pass={1} xwiki.authentication.ldap.validate_password=0 xwiki.authentication.ldap.UID_attr=sAMAccountName xwiki.authentication.ldap.password_field=userPassword xwiki.authentication.ldap.fields_mapping=name=sAMAccountName,last_name=sn,first_name=givenName,fullname=displayName,mail=mail,ldap_dn=dn xwiki.authentication.ldap.update_user=1 xwiki.authentication.ldap.mode_group_sync=always xwiki.authentication.ldap.trylocal=0 xwiki.authentication.ldap.ssl=0 xwiki.authentication.ldap.ssl.keystore= --snap-- Cheers and many thanx for suggestions in advance... Sebastian PS: the users to be authenticated are all able to bind to the AD, so I figured the ldap configuration to be right so. Nethertheless this NullPointerException comes up. I'm using XWiki 1.7 war in Apache Tomcat 6.0.18 at the moment, as I think switching to Jboss later, once this whole stuff works shouldn't be too hard.