title: Can't get reference of ConfigurationAdmin in RAP
body: <p>I'm trying to configure the <a href="https://github.com/hstaudacher/osgi-jax-rs-connector" rel="nofollow">osgi-jax-rs-connector</a> in my RAP application.</p>
  
  <p>The README says to use the Configuration Admin Service for configuration.</p>
  
  <pre class="lang-java prettyprint-override"><code>ServiceReference caRef = context
      .getServiceReference(ConfigurationAdmin.class.getName());
  </code></pre>
  
  <p>The code above always returns <code>null</code> for the <code>ServiceReference</code>.
  What's the correct way to obtain a reference to the ConfigurationAdmin.
  Does another bundle needs to be started before?</p>