LoginController.java

package br.edu.utfpr.spring.security.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
public class LoginController {

	@RequestMapping(value="/login",method=RequestMethod.GET)
	public String login(
			@RequestParam(value="error", required=false) String error, 
			Model model){
	
		if(error != null){
			model.addAttribute("error", "Usuário ou senha invalido");
		}
		
		return "login";
	}
}