public interface HelloPlugin { void sayHello(); } public class HelloPluginImpl implements HelloPlugin { @Override public void sayHello() { System.out.println("Hello from HelloPlugin!"); } } BundleContext bundleContext = FrameworkUtil.getBundle(this.getClass()).getBundleContext(); ServiceRegistration<HelloPlugin> registration = bundleContext.registerService(HelloPlugin.class, new HelloPluginImpl(), null); ServiceReference<HelloPlugin> reference = bundleContext.getServiceReference(HelloPlugin.class); HelloPlugin plugin = bundleContext.getService(reference); plugin.sayHello();