A UserType class used to implement a form for the User entity - http://www.symfonycentral.com/symfony-does-validation.html

UserType.php

<?php

namespace MyCompany\BlogBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilder;

class UserType extends AbstractType
{
    public function buildForm(FormBuilder $builder, array $options)
    {
        $builder
            ->add('username')
            ->add('email')
            ->add('password', 'password')
        ;
    }

    public function getName()
    {
        return 'mycompany_blogbundle_usertype';
    }
}