Création de l'entité User et mise à jour de la base !

Bonjour,

Voila je rencontre un petit problème avec mon code.

Ce que je fais

Créer une entité User.php

<?php

namespace App\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Security\Core\User\UserInterface;
use Symfony\Component\Validator\Constraints as Assert;

/**
 * @ORM\Entity(repositoryClass="App\Repository\UserRepository")
 */
class User implements UserInterface
{
    /**
     * @ORM\Id()
     * @ORM\GeneratedValue()
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $email;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $password;

    /**
 * @ORM\Column(type="json")
 */
 private $roles = [];

    /**
     * @Assert\NotBlank()
     * @Assert\Length(max=4096)
     */
    private $plainPassword;

    /**
     * @ORM\OneToMany(targetEntity=Facture::class, cascade={"persist", "remove"}, mappedBy="user")
     */
    private $facture;

    public function __construct()
    {
        $this->factures = new ArrayCollection();
    }

    public function getId(): ?int
    {
        return $this->id;
    }

    public function getEmail(): ?string
    {
        return $this->email;
    }

    public function setEmail(string $email): self
    {
        $this->email = $email;

        return $this;
    }

    public function getPassword(): ?string
    {
        return $this->password;
    }

    public function setPassword(string $password): self
    {
        $this->password = $password;

        return $this;
    }

    public function getPlainPassword()
    {
        return $this->plainPassword;
    }

    public function setPlainPassword($password)
    {
        $this->plainPassword = $password;
    }

    public function getUsername()
    {
        return $this->email;
    }

    public function getSalt()
    {
        return null;
    }

    // La méthode getPassword() est déjà implémentée
    //public function getPassword()
    //{
    //    return $this->password;
    //}

    public function getRoles()
    {
      $roles = $this->roles;
      // guarantee every user at least has ROLE_USER
      $roles[] = 'ROLE_USER';

      return array_unique($roles);
    }

    public function eraseCredentials()
    {
    }

    public function getFacture(): ?string
    {
        return $this->facture;
    }

    public function setFacture(string $facture): self
    {
        $this->facture = $facture;

        return $this;
    }

    public function addFacture(Facture $facture)
    {
        $this->factures->add($facture);
        $facture->setUser($this);
    }

}

Ce que je veux

J'aimerais pouvoir mettre à jour ma base de données avec ces 2 commandes
php bin/console doctrine:migration:diff
php bin/console doctrine:migration:migrate

Ce que j'obtiens cette erreur dans la console

Anouchka@Anouchka MINGW64 /c/xampp/htdocs/devis_facture (master)
$ php bin/console doctrine:migration:migrate

                Application Migrations

WARNING! You are about to execute a database migration that could result in schema changes and data loss. Are you sure you wish to continue? (y/n)y
Migrating up to 20190425202523 from 0

++ migrating 20190422172802

 -> CREATE TABLE user (id INT AUTO_INCREMENT NOT NULL, email VARCHAR(255) NOT NULL, password VARCHAR(255) NOT NULL, roles JSON NOT NULL, PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicod

e_ci ENGINE = InnoDB
Migration 20190422172802 failed during Execution. Error An exception occurred while executing 'CREATE TABLE user (id INT AUTO_INCREMENT NOT NULL, email VARCHAR(255) NOT NULL, password VARCHAR(255) NOT NULL, rol
es JSON NOT NULL, PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci ENGINE = InnoDB':

SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'JSON NOT NULL, PR
IMARY KEY(id)) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_un' at line 1

In AbstractMySQLDriver.php line 79:

An exception occurred while executing 'CREATE TABLE user (id INT AUTO_INCREMENT NOT NULL, email VARCHAR(255) NOT NULL, password VARCHAR(255) NOT NULL, roles JSON NOT NULL, PRIMARY KEY(id)) DEFAULT CHARACTE
R SET utf8mb4 COLLATE utf8mb4_unicode_ci ENGINE = InnoDB':

SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'JSON NOT NUL
L, PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_un' at line 1

In PDOConnection.php line 90:

SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'JSON NOT NUL
L, PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_un' at line 1

In PDOConnection.php line 88:

SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'JSON NOT NUL
L, PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_un' at line 1