symfony 2 : Namespace “Acme” does not contain any mapped entities

Question

I am following the book and on the page http://symfony.com/doc/current/book/doctrine.html

While following the book I am trying to work on relationship of product and cat

Answer 1

One of the two things may be the problem,

1. make sure you have a use statement at the top, that is

   use Acme\StoreBundle\Entity\Product;

   It is not included in the example, they only displayed use Doctrine\Common\Collections\ArrayCollection;

2. When specifying target entity always specify full namespace if the entities are in different name spaces. example:

   @ORM\OneToMany(targetEntity="Acme\StoreBundle\Entity\Product", mappedBy="category")

   instead of:

   @ORM\OneToMany(targetEntity="Product", mappedBy="category")

   The second one only works if the two entities are in same namespace and that entity has been called by use statement above the class.