/**
     * Update User Password in Microsoft Active Directory
     * @param username
     * @param password
     */
    public void updateUserPassword(String username, String password)
    {
	try
	{
	    System.out.println("updating password...\n");
	    String quotedPassword = "\"" + password + "\"";
	    char unicodePwd[] = quotedPassword.toCharArray();
	    byte pwdArray[] = new byte[unicodePwd.length * 2];
	    for (int i = 0; i < unicodePwd.length; i++)
	    {
		pwdArray[i * 2 + 1] = (byte) (unicodePwd[i] >>> 8);
		pwdArray[i * 2 + 0] = (byte) (unicodePwd[i] & 0xff);
	    }
	    System.out.print("encoded password: ");
	    for (int i = 0; i < pwdArray.length; i++)
	    {
		System.out.print(pwdArray[i] + " ");
	    }
	    System.out.println();
	    ModificationItem[] mods = new ModificationItem[1];
	    mods[0] = new ModificationItem(DirContext.REPLACE_ATTRIBUTE, new BasicAttribute("UnicodePwd", pwdArray));
	    ldapContext.modifyAttributes("cn=" + username + BASE_NAME, mods);
	}
	catch (Exception e)
	{
	    System.out.println("update password error: " + e);
	}
    }