No identifier/primary key specified for Entity (...) Every Entity must have and identifier/primary key

Hope this helps TableNameID for clarity
Improve JOIN readability Clarity, say, when multiple FK "ID" columns (PK matches FK) ID is a reserved keyword

it fixes the issue Have you checked the docs?
You can define a primary key by using the @ORM\Id annotation. In case the value is generated automatically (e.g. if using auto_increment), you also need to set the @ORM\GeneratedValue(strategy="IDENTITY") annotation.

seems to work fine In Doctrine 2/Symfony 3 with Postgres as the database I am trying to create a table with following fields: , First of all, your ActionTaskReview should extend ActionReview:

namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;

use JMS\Serializer\Annotation\Exclude;

/**
 * ActionTaskReview
 * @ORM\Entity
 */
class ActionTaskReview extends ActionReview
{
...
}

Hope that helps What I try to do is to have two classes User in one file and Video in another. My task is to do database where user have to login and after that he can upload video. The video have entity $uploaded_by and there should go $id from the User class. , try to change this:

/**@ORM\Id @ORM\Column(type="integer") **/
protected $id;

/**
 * @var int
 *
 * @ORM\Column(name="id", type="integer")
 * @ORM\Id
 * @ORM\GeneratedValue(strategy="IDENTITY")
 */
protected $id;

fixed the issue. Will look into that further the subkey entity: tells the security component to use doctrine to fetch a User entity from the database, which doesn't really work if you don't use the database to store users.
the security component is also made to check if a user - which is logged in - might have changed between requests. So you user most likely will also be logged out regularly. for all the details have a look at https://symfony.com/doc/current/security/user_provider.html . maybe you can come up with a custom user provider that stores the user information in some temporary directory for a while or something ...