Symfony 2.1中的注释验证不起作用

实体属性：

 /**
 * @var string $content
 *
 * @ORM\Column(name="content", type="string", length=300)
 * @Assert\NotBlank(message="Please enter question")
 * @Assert\Length(
 *   min = "15",
 *   max = "300",
 *   minMessage = "Text question must be larger than 15 symbol",
 *   maxMessage = "Text question must be less than 300 symbol"
 * )
 */
protected $content;

表格提交（在控制器中）：

没有显示错误((

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为什么不阅读注释验证。其他属性是很好的验证。

您是否尝试将bind（）置于POST检查之外？

 is you set form reset tag in your twig template 

like this 
 {{ form_rest(form) }}

 is you set form reset tag in your twig template 

like this 
 {{ form_rest(form) }}