New Symfony2 User Class gives Fatal Error - php

Question

I am trying to move from manually specified users in security.yml to database users. I have read http://symfony.com/doc/current/book/security.html#loading-users-from-the-database and implemented their example, then expanded on it using a friend's user class. When I try to run php app/console doctrine:generate:entities I get the following error: Class MyFreelancer\PortalBundle\Entity\User contains 7 abstract methods and must therefor be declared abstract or implement the remaining methods and then a list of methods that goes off the page.
My code is as follows:
<?php
namespace MyFreelancer\PortalBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\Criteria;
use Doctrine\Common\Collections\ArrayCollection;
use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
use Symfony\Component\Validator\Constraints as Assert;
use JMS\Serializer\Annotation as Ser;
use Gedmo\Mapping\Annotation as Gedmo;
use Symfony\Component\Security\Core\User\Role;
use Symfony\Component\Security\Core\User\UserInterface;
/**
* User
*
* #ORM\Entity
* #ORM\Table(name="users")
* #Ser\ExclusionPolicy("all")
*/
class User implements UserInterface, \Serializable
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
* #Ser\Expose
*/
private $id;
/**
* #var string
*
* #ORM\Column(name="role_id", type="integer")
* #Assert\Range(min=1)
*/
private $roleId;
/**
* #var string
*
* #ORM\Column(name="username", type="string", length=100)
* #Assert\Length(min=3, max=100)
* #Ser\Expose()
*/
private $username;
/**
* #var string
*
* #ORM\Column(name="password", type="string", length=2048)
* #Assert\Length(min=8, max=2048)
*/
private $password;
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=100)
* #Assert\Length(min=3, max=100)
* #Ser\Expose()
*/
private $name;
/**
* #var string
*
* #ORM\Column(name="surname", type="string", length=100)
* #Assert\Length(min=3, max=100)
* #Ser\Expose()
*/
private $surname;
/**
* #var string
*
* #ORM\Column(name="email", type="string", length=200)
* #Assert\Email(checkMX=true)
* #Ser\Expose()
*/
private $email;
/**
* #var string
*
* #ORM\Column(name="cell", type="string", length=20, nullable=true)
* #Assert\Length(min=10, max=20)
* #Ser\Expose()
*/
private $cell;
}
?>
I have looked at Symfony2 Fatal error in Users Entity Provider, but I do not know what has to go into those methods if I have to implement them manually. Also, isn't doctine:generate:entities supposed to do that for you? If declaring the class as abstract is easier, how do I do that? What does that entail?
While we are on the topic, how do I save/retrieve the save user roles to the database, such as (from security.yml)
role_hierarchy:
ROLE_ADMIN: ROLE_USER
ROLE_SUPER_ADMIN: [ROLE_USER, ROLE_ADMIN, ROLE_ALLOWED_TO_SWITCH]
This is actually a second question and if it cannot be answered here then I will open a new topic. Thank you to everyone who has read this question.

Answer 1

The cookbook article about the entity provider at http://symfony.com/doc/current/cookbook/security/entity_provider.html shows how to set this up correctly.