Activator.java

package org.foo.hello.impl;

import org.foo.hello.Greeting;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;

public class Activator implements BundleActivator {

  public void start(BundleContext ctx) {
    ctx.registerService(Greeting.class.getName(),
        new GreetingImpl("service"), null);
  }

  public void stop(BundleContext ctx) {}
}