I'm writing a thick java client application which interfaces with a JBOSS 5.1 back-end. For one deployment a SPNEGO Login module is used. I've had success before autheticating to LDAP login modules using the UsernamePasswordCallbackHandler but when I tried to use this to authenticate to SPNEGO a null pointer was thrown. I've been searching around for a callbackhandler specific to SPNEGO but have been unable to find one, does anyone know if such a thing exists or if not, can you point me in the right direction for authenticating to SPNEGO using a thick java client? UsernamePasswordHandler handler = new UsernamePasswordHandler(username, | password); | | LoginContext lc = new LoginContext("SPNEGO", handler); | lc.login(); javax.security.auth.login.LoginException: java.lang.NullPointerException | at org.jboss.security.negotiation.spnego.SPNEGOLoginModule.login(SPNEGOLoginModule.java:106) | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) | at java.lang.reflect.Method.invoke(Method.java:597) | at javax.security.auth.login.LoginContext.invoke(LoginContext.java:769) | at javax.security.auth.login.LoginContext.access$000(LoginContext.java:186) | at javax.security.auth.login.LoginContext$4.run(LoginContext.java:683) | at java.security.AccessController.doPrivileged(Native Method) | at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680) | at javax.security.auth.login.LoginContext.login(LoginContext.java:579) | View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4258446#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...