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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");
    	
    	if(username.matches("[\\w]*")) errors.add("Incorrect username format.");
    	if(password.matches("[\\w]*")) errors.add("Incorrect password format.");
    	
    	if(errors.size() > 0) return "error.do";
    	
    	UserBean dbUser = this.userDAO.lookup(username);
    	if(!dbUser.checkPassword(password)) {
    		errors.add("Passwords do not match.");
    		return "error.do";
    	}
    	
    	HttpSession session = request.getSession();
    	session.invalidate();
    	session = request.getSession(true);
    	session.setMaxInactiveInterval(2*60*60);
    	session.setAttribute("user", dbUser);
    	
    	return "welcome.do";
}