Symfony 3.4. Can't override a service

You have to add this code in src/AppBundle/AppBundle.php:

In function build()

$container->addCompilerPass(new OverrideServiceCompilerPass());

All class:

class AppBundle extends Bundle{    public function build(ContainerBuilder $container)    {        parent::build($container);        $container->addCompilerPass(new OverrideServiceCompilerPass());    }}

https://symfony.com/doc/3.4/service_container/compiler_passes.html

Else your compilerpass is not load.

For the specific case of overriding a service the only thing you have to do is define a new service in your bundle( or app folder) services.yml like this

       lexik_jwt_authentication.security.guard.jwt_token_authenticator:       class: SeguridadBundle\DependencyInjection\MyJWTTokenAuthenticator       arguments: ["@lexik_jwt_authentication.jwt_manager", "@event_dispatcher", "@lexik_jwt_authentication.extractor.chain_extractor"]

There are some rules, of course:

• The name of the service must be exactly the same it has in the vendor. So, the one I wrote above overrides another service called lexik_jwt_authentication.security.guard.jwt_token_authenticator in theLexikJWTAuthentication vendor.
• The class specified will be the one with your own implementation.

So, when overriding a service you need to create a new definition that keeps the same name that the original, but with a different class for instantiation.Notice that, for matters of compatibility, is a good advice to implement the same interfaces the original does, that is: follow the same conventions that the original service in order of guarantee the compatibility.

Sorry for my english and I hope it helps