Spring MVC; error messages of validation form not being displayed - spring-boot

Question

I have built a form for login. I've read about validations with spring mvc following a tutorial.
The form is blank & doesn't pass values, however it doesn't show any error messages.
This is my code for the controller:
#Controller
public class LoginController {
#RequestMapping("/login")
public ModelAndView login() {
return new ModelAndView("login", "user", new UserModel());
}
#RequestMapping("/submitLogin")
public ModelAndView submitLogin(#Valid UserModel user, BindingResult result) {
ModelAndView model = new ModelAndView();
model.addObject("user", user);
model.setViewName(result.hasErrors() ? "login" : "index");
return model;
}
}
This is my model:
#Data
public class UserModel {
#NotBlank(message = "The field login name is required")
private String login;
#NotBlank(message = "The field password is required")
private String password;
}
And this is my form:
<mvc:form modelAttribute="user" class="col s12" action="/submitLogin" method="POST">
<div class="container login-form">
<div class="row">
<div class="input-field col s12">
<mvc:input path="login" id="userName" type="text" class="validate" />
<mvc:label path="login" for="userName">Login name</mvc:label>
</div>
</div>
<div class="row">
<mvc:errors path="login" cssStyle="color: #ff0000;"/>
</div>
<div class="row">
<div class="input-field col s12">
<mvc:input path="password" id="password" type="password" class="validate" />
<mvc:label path="password" for="password">Password</mvc:label>
</div>
</div>
<div class="row">
<mvc:errors path="password" cssStyle="color: #ff0000;"/>
</div>
<div class="row">
<input type="submit" class="btn waves-effect waves-light pulse green" value="Entrar"/>
</div>
</div>
</mvc:form>
Did I miss any configuration on spring boot or annotation?