Doctrine Uploadable extention uses

Appkernel.php

...
new Stof\DoctrineExtensionsBundle\StofDoctrineExtensionsBundle(),
...

composer.json

....
"stof/doctrine-extensions-bundle": "~1.1@dev",
.....

config.yml

stof_doctrine_extensions:
    default_locale: en_US
    uploadable: ~
    class:
        uploadable:     ...\UploadableListener
    orm:
        default:
            uploadable:      true

Controller.php

$em->persist($entity);
 .....
 $uploadableManager = $this->get('stof_doctrine_extensions.uploadable.manager');
 $uploadableManager->markEntityToUpload($entity, $entity->getFile());
....
$em->flush();

Entity.php

<?php

namespace Setting\Bundle\ContentBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\HttpFoundation\File\UploadedFile;
use Symfony\Component\Validator\Constraints as Assert;
use Gedmo\Mapping\Annotation as Gedmo;

/**
 * Entity
 *
 * @ORM\Table()
 * @ORM\Entity(repositoryClass="Setting\Bundle\ContentBundle\Entity\SiteSliderRepository")
 * @Gedmo\Uploadable(pathMethod="getUploadRootDir", allowOverwrite=false, appendNumber=true)
 */
class Entity
{
    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;


    /**
     * @var string
     * @Gedmo\UploadableFileName
     * @ORM\Column(name="path", type="string", length=255, nullable=true)
     */
    private $path;

    /**
     * @Assert\File(maxSize="")
     */
    protected $file;

    /**
     * Sets file.
     *
     * @param UploadedFile $file
     */
    public function setFile(UploadedFile $file = null)
    {
        $this->file = $file;
    }

    /**
     * Get file.
     *
     * @return UploadedFile
     */
    public function getFile()
    {
        return $this->file;
    }

    /**
     * @return string
     */
    public function getPath()
    {
        return $this->path;
    }

    /**
     * @param string $path
     */
    public function setPath($path)
    {
        $this->path = $path;
    }

    protected function getUploadRootDir()
    {
        return "file_path";
    }

    /**
     * @return int
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * @param int $id
     */
    public function setId($id)
    {
        $this->id = $id;
    }
}

UploadableListener.php

<?php

namespace ....;

use Gedmo\Uploadable\UploadableListener as BaseListener,
    Gedmo\Uploadable\FileInfo\FileInfoInterface;

class UploadableListener extends BaseListener
{

    public function moveFile(FileInfoInterface $fileInfo, $path, $filenameGeneratorClass = false, $overwrite = false, $appendNumber = false, $object)
    {
        $info = parent::moveFile($fileInfo, $path, $filenameGeneratorClass, $overwrite, $appendNumber, $object);
        $info['fileName'] = basename($info['filePath']);

        return $info;
    }
}