private String validatePassword( final Map<String, String> propertiesSentToClient, final Map<String, String> propertiesReadFromClient, final String clientName) { final DBUserController userController = new DBUserController(); if (!userController.login(clientName, propertiesReadFromClient.get(HASHED_PASSWORD_KEY))) { if (userController.doesUserExist(clientName)) { return "Incorrect password"; } else { return "Username does not exist"; } } else { return null; } }