Symfony 3.2 A circular reference has been detected (configured limit: 1)

Question

I have this two entities in my project

class PoliceGroupe
{
    /**
     * @var int
     *
     * @ORM\\Column(name=\"id\", type=\"integer\")
     * @ORM\\I         


        

Answer 1

Fixed same issue by

use JMS\Serializer\SerializerBuilder;
...

$products = $em->getRepository('AppBundle:Product')->findAll();
$serializer = SerializerBuilder::create()->build();
$jsonObject = $serializer->serialize($products, 'json');

Read here