title: Couldn't find org.osgi.util.tracker.ServiceTracker
body: <p>I am learning OSGi follow this <a href="http://felix.apache.org/documentation/tutorials-examples-and-presentations/apache-felix-osgi-tutorial/apache-felix-tutorial-example-5.html" rel="nofollow">Apache Felix Tutorial</a>, everything went on wheels until this example 5, I've been told that felix <strong>couldn't find the class</strong> <code>org.osgi.util.tracker.ServiceTracker</code>. I copied all the exact code and the manifest meta data on the page, I'm totally confused, can someone help me with this?</p>