ExceptionListener.php

<?php

namespace Acme\DemoBundle\EventListener;


use Symfony\Bundle\FrameworkBundle\Templating\EngineInterface;
use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;

class ExceptionListener
{
    protected $engine;

    public function __construct(EngineInterface $engine)
    {
        $this->engine = $engine;
    }

    public function onKernelException(GetResponseForExceptionEvent $event)
    {
        $controller = $event->getRequest()->get('_controller');

        $templateName = '';

        /**
         * Your own logic here to define which template to display according to which bundle $controller belongs.
         */

        $event->setResponse($this->engine->renderResponse($templateName, array(
            'exception' => $event->getException(),
        )));

    }
} 

services.xml

<?xml version="1.0" ?>

<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
    
    <services>
        <service id="acme.exception.listener" class="Acme\DemoBundle\EventListener\ExceptionListener">
            <tag name="kernel.event_listener" event="kernel.exception" method="onKernelException" />
        </service>
    </services>
</container>