OSGi tutorial .[http://www.knopflerfish.org/tutorials/osgi_tutorial.pdf http://www.knopflerfish.org/tutorials/osgi_tutorial.pdf]  Examples  - run .

Run ant build --> package org.osgi.framework does not exist

http://alfredo.perseum.com/blog/en/category/osgi/:

5.2 Retrieve a Service – the bad way