无法对类型的对象进行非规范化，找不到支持的规范化器。 Symfony 2.8

Question

I'm trying to serialize and deserialize between json and doctrine entity but keep getting this error

"Could not denormalize object of type AppBundle/Person, no supporting normalizer found. "

My entity class

<?php

namespace AppBundle\Entity;

class Person
{
    private $age;
    private $name;

    // Getters
    public function getName()
    {
        return $this->name;
    }

    public function getAge()
    {
        return $this->age;
    }

    // Setters
    public function setName($name)
    {
        $this->name = $name;
    }

    public function setAge($age)
    {
        $this->age = $age;
    }

}

My controller

<?php

namespace AppBundle\Controller;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Response;
use AppBundle\Entity\Person;
use Symfony\Component\Serializer\Serializer;
use Symfony\Component\Serializer\Encoder\XmlEncoder;
use Symfony\Component\Serializer\Encoder\JsonEncoder;
use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
use Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer;

class RawGrnController extends Controller
{
    public function newAction(Request $request)
    {
        $encoders = array(new XmlEncoder(), new JsonEncoder());
        $normalizers = array(new ObjectNormalizer(),new  GetSetMethodNormalizer());
        $serializer = new Serializer($normalizers, $encoders);

        $data =$data = <<<EOF
        <person>
            <name>foo</name>
            <age>99</age>
        </person>
        EOF;

        $person = $serializer->deserialize($data, 'AppBundle\Person', 'xml');

        $reaponse = new Response($person);
        return $reaponse;
    }
}

I got this code from the official Symfony documentation Here .I have tried to use this in my real project and got the above error then, I tried the example on the documentation but still getting the same error.

Things I've tried so far

• Serialize an object to json/xml and tried to deserialize it again
• Decode json/xml to an array and then denormalize to an object(decode is successful but denormalizing gives the same error)
• Tried to use serializer as a service as described in Here

I have no clue what I'm missing to get the normalizer to work. Objects in my project are far more complex but I'm getting bit suspicious as the example in documentation gives the same error. Any help is highly appreciated.

Answer 1

For future generations, if you inject the serializer into the controller in order to deserialize a POST request body (for example) and you have this error, you probably just imported symfony/serializer and forgot to import symfony/serializer-pack

more information on How to use the serializer