Symfony2 FOSREST JMS \\ Serializer软件包错误

Question

Can you help to fix the following error?

InvalidArgumentException: "fos_rest.serializer" must implement FOS\RestBundle\Serializer\Serializer (instance of "JMS\Serializer\Serializer" given).
in C:\wamp\www\SymfonyRestAPI\src\FOS\RestBundle\DependencyInjection\Compiler\SerializerConfigurationPass.php line 58
at SerializerConfigurationPass->process(object(ContainerBuilder)) in C:\wamp\www\SymfonyRestAPI\vendor\symfony\symfony\src\Symfony\Component\DependencyInjection\Compiler\Compiler.php line 117
at Compiler->compile(object(ContainerBuilder)) in C:\wamp\www\SymfonyRestAPI\vendor\symfony\symfony\src\Symfony\Component\DependencyInjection\ContainerBuilder.php line 613
at ContainerBuilder->compile() in C:\wamp\www\SymfonyRestAPI\app\bootstrap.php.cache line 2502
at Kernel->initializeContainer() in C:\wamp\www\SymfonyRestAPI\app\bootstrap.php.cache line 2281
at Kernel->boot() in C:\wamp\www\SymfonyRestAPI\app\bootstrap.php.cache line 2312
at Kernel->handle(object(Request)) in C:\wamp\www\SymfonyRestAPI\web\app_dev.php line 28

Answer 1

This exception has been introduced in FOSRestBundle 2.0 (see here ) because of a serializer abstraction layer introduced in 2.0 too. It is normally automatically managed by the bundle which detects the JMS serializer.

Did you add the JMSSerializerBundle to your kernel as following?

// app/AppKernel.php
class AppKernel extends Kernel
{
    public function registerBundles()
    {
        $bundles = array(
            // ...
            new JMS\SerializerBundle\JMSSerializerBundle(),,
        );

        // ...
    }
}

This should be the problem here.

If it isn't, then maybe you tried to define directly the serializer FOSRestBundle uses, the following is a bad practice most of the time and should only be used if you know what you do :

// services.yml
services:
    fos_rest.serializer:
        // This won't work in case your class doesn't
        // implement FOS\RestBundle\Serializer\Serializer
        class: My\Serializer 

If my second proposition is your case, you custom serializer has to implement the interface FOS\\RestBundle\\Serializer\\Serializer .