title: Event Observer triggered in AppBundleA when service registered in AppBundleB
body: <p><strong>SHORT</strong></p>
  
  <p>I have an Event Observer that is triggered in AppBundleA. Even though I've registered the service in AppBundleB. Is this how services work? This is my first time using them.</p>
  
  <p><strong>LONG</strong></p>
  
  <p>I'm trying to implement the Before/After filters in my Symfony(v2.8) app using Event Subscribers:</p>
  
  <ul>
  <li><a href="http://symfony.com/doc/2.8/event_dispatcher/before_after_filters.html" rel="nofollow noreferrer">http://symfony.com/doc/2.8/event_dispatcher/before_after_filters.html</a></li>
  <li><a href="http://symfony.com/doc/2.8/event_dispatcher.html#creating-an-event-subscriber" rel="nofollow noreferrer">http://symfony.com/doc/2.8/event_dispatcher.html#creating-an-event-subscriber</a></li>
  </ul>
  
  <p>According to the example, I've registered the service globally in:</p>
  
  <pre><code>app/config/services.yml
  </code></pre>
  
  <p>The service worked and triggered correctly.</p>
  
  <p>Next, I wanted to localize the service to a particular bundle so I moved the service registration to AppBundleB.</p>
  
  <pre><code># AppBundleB\Resources\config\services.yml
  services:
      app.tokens.action_subscriber:
          class: AppBundle\EventSubscriber\TokenSubscriber
          arguments: ['%tokens%']
          tags:
              - { name: kernel.event_subscriber }
  </code></pre>
  
  <p>However, when I ran a controller function in AppBundleA, it triggered the service above.</p>
  
  <p>I don't believe this is supposed to happen. Does anyone have any ideas? Let me know if you need any other information.</p>
  
  <p><strong>Symfony v2.8</strong></p>