/**
* @ORM\Column(type="string", length=255)
*
* @Assert\NotBlank(message="Please enter your name.", groups={"Registration", "Profile"})
* @Assert\MinLength(limit="3", message="The name is too short.", groups={"Registration", "Profile"})
* @Assert\MaxLength(limit="255", message="The name is too long.", groups={"Registration", "Profile"})
*/
protected $name;
Your Annotations annotation contains two parts, entity field (Column) and validation rule (Assert), which need to be defined in two Yml files respectively in Symfony.
Entity fields:
http://symfony.com/doc/current/book/doctrine.html
Verification rules:
http://symfony.com/doc/current/book/validation.html