Authenticate user by LDAP server

Question

Environment: WLS6.0 Netscape Directory Server 4.1
I have successful protect a servlet and authenticate user by "File Realm". But I can't authenticate user by "Security Realm(LDAP). Pls tell me any configure I miss.
======weblogic.xml entites========
<security-rike-assignment>
<role-name>manager</role-name>
<principal-name>joan</principal-name>
<principal-name>awang</principal-name>
</security-role-assignment>
(the user joan has defined in "File Realm", and there is a user in LDAP: uid=awang, ou=IT, dc=CMD)
And why the user "awang" can't access the servlet (the username field enter "awang"; the password filed enter "awang123")
=====config.xml entities=====
<LDAPRealm AuthProtocol="simple" Crdential="awang123" GroupDN="dc=CMD" GroupIsContext="false" LDAPURL="ldap://127.0.0.1:389" Name="defaultLDAPRealmForNetscapeDirectoryServer" Principal="uid=awang, ou=IT, dc=CMD" UserAuthentication="local" UserDN="dc=CMD" UserNameAttribute="uid"

Answer 1

You can use jsp's and servlets.
Have a .jsp (i.e. login.jsp) that has 2 fields username / password and a submit button i.e.
<form method="post" action="/servlet/LoginServlet">
<input type="text" size="15" name="username" value="">
<input type="password" size="15" name="password" value="">
<input type="submit" name="Submit" value="Authenticate">
</form>In your servlet (i.e. LoginServlet) is where you retrieve the username / password by doing something like:
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  String username = request.getParameter("username");
  String password = request.getParameter("password"); 
}You would now do your LDAP authentication. see http://java.sun.com/products/jndi/tutorial/ldap/security/ldap.html
Depending on whether the authentication was successful or not you would redirect the user to an error page or to the next .jsp (i.e changePassword.jsp) where they can change their password.