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Using with OSGi

<p>
	Since REST servlets are basically just <l>HttpServlets</l>, incorporating them into an OSGi environment
	is pretty straightforward.
</p>
<p>
	The following code shows how to register your REST servlets in an OSGi <l>Activator</l>:
</p>
<p class='bpcode w800'>
	<jk>package</jk> org.apache.juneau.examples.rest;
	
	<jk>import</jk> org.osgi.framework.*;
	<jk>import</jk> org.osgi.service.http.*;
	<jk>import</jk> org.osgi.util.tracker.*;
	
	<jk>import</jk> org.apache.juneau.rest.samples.*;
	
	<jd>/**
	 * Activator class used when running samples as a bundle in an OSGi environment.
	 */</jd>
	<jk>public class</jk> Activator <jk>implements</jk> BundleActivator, ServiceTrackerCustomizer {
	
		<jk>private</jk> ServiceTracker <jf>httpServiceTracker</jf>;
		<jk>private</jk> BundleContext <jf>context</jf>;
	
		<ja>@Override</ja> <jc>/* BundleActivator */</jc>
		<jk>public void</jk> start(BundleContext context) <jk>throws</jk> Exception {
			<jk>this</jk>.<jf>context</jf> = context;
			<jf>httpServiceTracker</jf> = <jk>new</jk> ServiceTracker(context, HttpService.<jk>class</jk>.getName(), <jk>this</jk>);
			<jf>httpServiceTracker</jf>.open();
		}
	
		<ja>@Override</ja> <jc>/* BundleActivator */</jc>
		<jk>public void</jk> stop(BundleContext context) <jk>throws</jk> Exception {
			<jf>httpServiceTracker</jf>.close();
		}
	
		<ja>@Override</ja> <jc>/* ServiceTrackerCustomizer */</jc>
		<jk>public</jk> Object addingService(ServiceReference reference) {
			Object service = <jf>context</jf>.getService(reference);
	
			<jk>if</jk> (service <jk>instanceof</jk> HttpService) {
				HttpService s = (HttpService)service;
				<jk>try</jk> {
					s.registerServlet(<js>"/sample"</js>, <jk>new</jk> MyRestServlet(), <jk>null</jk>, <jk>null</jk>);
				} <jk>catch</jk> (Exception e) {
					<jk>throw new</jk> RuntimeException(e);
				}
			}
	
			<jk>return</jk> service;
		}
	
		<ja>@Override</ja> <jc>/* ServiceTrackerCustomizer */</jc>
		<jk>public void</jk> modifiedService(ServiceReference reference, Object service) {
		}
	
		<ja>@Override</ja> <jc>/* ServiceTrackerCustomizer */</jc>
		<jk>public void</jk> removedService(ServiceReference reference, Object service) {
		}
	}
</p>