Homemade WebSphere LDAP Authentication

import java.util.HashSet;
import java.util.Set;

import javax.faces.context.FacesContext;
import javax.security.auth.login.AccountExpiredException;
import javax.security.auth.login.CredentialExpiredException;
import javax.security.auth.login.FailedLoginException ;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;

import com.ibm.websphere.security.auth.callback.WSCallbackHandlerImpl;
import uk.org.gth.exceptions.LoginException;

public class LoginUtils {

 public static void doLogin(String username, String password, FacesContext facesContext)
   throws LoginException {
  LoginContext loginContext = null;
  
  try {
   loginContext = new LoginContext("WSLogin", new WSCallbackHandlerImpl(username, password)); 
   loginContext.login();
  } catch (AccountExpiredException e) {
   throw new LoginException("Account has Expired.");
  } catch (CredentialExpiredException e) {
   throw new LoginException("Credentials have Expired."); 
  } catch (FailedLoginException e) {
   throw new LoginException("Login Failure.");
  } catch (LoginException e) {
   if (e.getMessage().indexOf("52e") > 0) {
    throw new LoginException("Invalid Password."); 
   } else if (e.getMessage().indexOf("532") > 0) {
    throw new LoginException("Password Has Expired.");
   } else if (e.getMessage().indexOf("533") > 0) {
    throw new LoginException("Your account has been disabled."); 
   } else if (e.getMessage().indexOf("701") > 0) {
    throw new LoginException("Your account has expired.");
   } else if (e.getMessage().indexOf("773") > 0) {
    throw new LoginException("Your password must be reset."); 
   } else {
    throw new LoginException(e.getMessage());
   }
  } catch (SecurityException e) {
   throw new LoginException("Cannot create LoginContext.");
  }
 }
 
}