public JAASCallbackHandler(JAASRealm realm,
    String username,
    String password) 
{
        super();
        this.realm = realm;
        this.username = username;
        if (realm.hasMessageDigest()) {
            this.password = realm.digest(password);
        }
        else {
            this.password = password;
        }
}

Construct a callback handler configured with the specified values. Note that if the JAASRealm instance specifies digested passwords, the password parameter will be pre-digested here.

Parameters:

realm - Our associated JAASRealm instance

username - Username to be authenticated with

password - Password to be authenticated with

 public  void handle(Callback[] callbacks) throws UnsupportedCallbackException, IOException 
{
    // --------------------------------------------------------- Public Methods
        for (int i = 0; i <  callbacks.length; i++) {
            if (callbacks[i] instanceof NameCallback) {
                if (realm.getContainer().getLogger().isTraceEnabled())
                    realm.getContainer().getLogger().trace(sm.getString("jaasCallback.username", username));
                ((NameCallback) callbacks[i]).setName(username);
            } else if (callbacks[i] instanceof PasswordCallback) {
                final char[] passwordcontents;
                if (password != null) {
                    passwordcontents = password.toCharArray();
                } else {
                    passwordcontents = new char[0];
                }
                ((PasswordCallback) callbacks[i]).setPassword
                    (passwordcontents);
            } else {
                throw new UnsupportedCallbackException(callbacks[i]);
            }
        }
}

Retrieve the information requested in the provided Callbacks. This implementation only recognizes NameCallback and PasswordCallback instances.