404 Page not found after login in custom login page - spring

Question

I am new in Spring and I'm trying to implement a custom login page. I am able to redirect to the custom login page but it goes to error 404 when I hit the Submit button in my page. The url went to : http://localhost:12345/login?username=abcd&password=qwer
Here is my code of the htm, controller and also the security config:
SecurityConfig.java
http
.authorizeRequests()
.antMatchers("/main",
"/main#/home",
"/login**",
"/resources/**",
"/css/**",
"/images/**",
"/js/**",
"/std/**",
"/system/**",
"/favicon.ico",
"/rest/**",
"/rest/user/**" ).permitAll()
.anyRequest().authenticated()
.and().csrf().disable()
.formLogin()
.loginPage("/main#/login").permitAll()
.defaultSuccessUrl("/main#/home")
.failureUrl("/main#/page/b").permitAll();
LoginController.Java
#RestController
#RequestMapping(value = "/rest/user")
public class LoginController
{
#RequestMapping(value = "login")
public String login(Model model, String error, String logout) {
if (error != null)
model.addAttribute("errorMsg", "Your username and password are invalid.");
if (logout != null)
model.addAttribute("msg", "You have been logged out successfully.");
return "login";
}
}
login-content.htm
<div class="col-md-6 col-md-offset-3">
<h2>Login</h2>
<form name="form" action="/login" ng-controller="LoginController" role="form">
<div class="form-group" ng-class="{ 'has-error': form.username.$dirty && form.username.$error.required }">
<label for="username">Username</label>
<input type="text" name="username" id="username" class="form-control" ng-model="user.username" required />
<span ng-show="form.username.$dirty && form.username.$error.required" class="help-block">Username is required</span>
</div>
<div class="form-group" ng-class="{ 'has-error': form.password.$dirty && form.password.$error.required }">
<label for="password">Password</label>
<input type="password" name="password" id="password" class="form-control" ng-model="user.password" required />
<span ng-show="form.password.$dirty && form.password.$error.required" class="help-block">password is required</span>
</div>
<input type="submit" ng-click="login(user)" value="Submit">
</form>
Thanks!

Answer 1

At the end I have modified the "action" in the Login-content.htm to another word (e.g. perform_login) and also added .loginProcessingUrl("/perform_login").permitAll() in the SecurityConfig.java.
Besides, the another problem is Spring Security will need to have a specific POST method in order to authenticate it. I have added method="POST" in the HTM page.
Thanks!