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    <p>solution of this problem is very simple. All problems associated with circular references at yours <code>User</code> and <code>Role</code> objects. So you have not to serialize <code>User::$roles</code> and <code>Role::$users</code> fields.</p> <p>Look at <code>Symfony\Component\Security\Core\Authentication\Token\AbstractToken::__construct()</code> and <code>Symfony\Component\Security\Core\Authentication\Token\AbstractToken::serialize()</code>.</p> <p>How you can see, Symfony take your user's roles by invoking <code>UserInterface::getRoles()</code> before serialization. And serialize <code>User</code> and <code>Roles</code> separately.</p> <p>You have to implement <code>\Serializable</code> interface in <code>User</code> and <code>Role</code> entities.</p> <h2>Example:</h2> <pre class="lang-php prettyprint-override"><code>/** * Acme\Bundle\UserBundle\Entity\User * * @ORM\Table(name="`user`") * @ORM\Entity(repositoryClass="Acme\Bundle\UserBundle\Entity\UserRepository") */ class User implements AdvancedUserInterface, EquatableInterface, \Serializable { /** * @var integer $id * * @ORM\Column(name="id", type="integer") * @ORM\Id * @ORM\GeneratedValue(strategy="AUTO") */ private $id; /** * @var string $username * * @ORM\Column(type="string", length=30, unique=true) */ private $username; /** * @var string $email * * @ORM\Column(type="string", length=100, unique=true) */ private $email; /** * @var string $salt * * @ORM\Column(type="string", length=40) */ private $salt; /** * @var string $password * * @ORM\Column(type="string", length=128) */ private $password; /** * @var boolean $isActive * * @ORM\Column(type="boolean") */ private $isActive; /** * User's roles. (Owning Side) * * @var ArrayCollection * * @ORM\ManyToMany(targetEntity="Role", inversedBy="users") */ private $roles; // ..... /** * @see \Serializable::serialize() */ public function serialize() { /* * ! Don't serialize $roles field ! */ return \serialize(array( $this-&gt;id, $this-&gt;username, $this-&gt;email, $this-&gt;salt, $this-&gt;password, $this-&gt;isActive )); } /** * @see \Serializable::unserialize() */ public function unserialize($serialized) { list ( $this-&gt;id, $this-&gt;username, $this-&gt;email, $this-&gt;salt, $this-&gt;password, $this-&gt;isActive ) = \unserialize($serialized); } } </code></pre> <pre class="lang-php prettyprint-override"><code>/** * Acme\Bundle\UserBundle\Entity\Role * * @ORM\Table(name="role") * @ORM\Entity * */ class Role implements RoleInterface, \Serializable { /** * @var integer $id * * @ORM\Column(type="integer") * @ORM\Id * @ORM\GeneratedValue(strategy="AUTO") */ private $id; /** * @var string $role * * @ORM\Column(name="role", type="string", length=20, unique=true) */ private $role; /** * Users in group (Inverse Side) * * @var ArrayCollection * * @ORM\ManyToMany(targetEntity="User", mappedBy="roles") */ private $users; // ..... /** * @see \Serializable::serialize() */ public function serialize() { /* * ! Don't serialize $users field ! */ return \serialize(array( $this-&gt;id, $this-&gt;role )); } /** * @see \Serializable::unserialize() */ public function unserialize($serialized) { list( $this-&gt;id, $this-&gt;role ) = \unserialize($serialized); } } </code></pre> <p>And all will be serialized/unserialized correctly.</p> <p>See discus at <a href="https://github.com/symfony/symfony/issues/3691">https://github.com/symfony/symfony/issues/3691</a></p> <p>See also: <a href="http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/cookbook/entities-in-session.html#serializing-entity-into-the-session">http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/cookbook/entities-in-session.html#serializing-entity-into-the-session</a></p>
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    1. USRoman Shamritskiy
    1. USRoman Shamritskiy
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    1. COFor some reason this is not working with me. Symfony2.1.3 & php 5.4.9. I get successfully login but then I get an exception in the logs `[2012-12-17 17:19:26] security.INFO: Authentication exception occurred; redirecting to authentication entry point (A Token was not found in the SecurityContext.) [] []` and I'm pointed back to the login page.
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    2. COLook for errors in your code. Or show me the code of `security.yml` and the user model. I'll try to help.
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    3. COI believe that this solution is correct. See discus on the GitHub: https://github.com/symfony/symfony/issues/3691#issuecomment-9831914
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