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private String login(HttpServletRequest request, HttpServletResponse response) {
    	List<String> errors = new ArrayList<String>();
        request.setAttribute("errors", errors);

    	String username = request.getParameter("username");
    	String password = request.getParameter("password");

        // Basic input validation
    	if(username.matches("[\\w]*")) errors.add("Incorrect username format.");
    	if(password.matches("[\\w]*")) errors.add("Incorrect password format.");

    	if(errors.size() > 0) return "error.jsp";

    	UserBean dbUser = this.userDAO.lookup(username);
    	if(!dbUser.checkPassword(password)) {
    		errors.add("Passwords do not match.");
    		return "error.jsp";
    	}

    	HttpSession session = request.getSession();
    	session.invalidate(); // Invalidate old session id
    	session = request.getSession(true); // Generate new session id
    	session.setMaxInactiveInterval(2*60*60); // Set session timeout to two hours
    	session.setAttribute("user", dbUser); // Store user bean within the session

    	return "welcome.jsp";
}