How to use form validation in Symfony?

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use SymfonyComponentValidatorConstraints as Assert;

class User
{
    /**
     * @AssertNotBlank()
     */
    private $username;

    /**
     * @AssertNotBlank()
     * @AssertEmail()
     */
    private $email;

    // ...
}

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use SymfonyComponentFormExtensionCoreTypeTextType;
use SymfonyComponentFormExtensionCoreTypeEmailType;
use SymfonyComponentFormExtensionCoreTypeSubmitType;
use SymfonyComponentFormFormBuilderInterface;
use SymfonyComponentOptionsResolverOptionsResolver;

class UserType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('username', TextType::class)
            ->add('email', EmailType::class)
            ->add('save', SubmitType::class)
        ;
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => User::class,
            'constraints' => [
                new AssertValid(),
            ],
        ]);
    }
}

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public function createAction(Request $request)
{
    $user = new User();
    $form = $this->createForm(UserType::class, $user);

    $form->handleRequest($request);

    if ($form->isSubmitted() && $form->isValid()) {
        // Save the user to the database
        $entityManager = $this->getDoctrine()->getManager();
        $entityManager->persist($user);
        $entityManager->flush();

        return $this->redirectToRoute('user_list');
    }

    return $this->render('user/create.html.twig', [
        'form' => $form->createView(),
    ]);
}