public interface HelloWorldService { void sayHello(); } public class HelloWorldServiceImpl implements HelloWorldService { public void sayHello() { System.out.println("Hello World!"); } } plain Bundle-SymbolicName: com.example.bundle Bundle-Version: 1.0.0 Bundle-Activator: com.example.bundle.Activator Export-Package: com.example.service Service-Component: OSGI-INF/helloworldservice.xml <?xml version="1.0" encoding="UTF-8"?> <scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0" name="com.example.service.helloworld"> <implementation class="com.example.bundle.HelloWorldServiceImpl"/> <service> <provide interface="com.example.service.HelloWorldService"/> </service> </scr:component> ServiceReference reference = context.getServiceReference(HelloWorldService.class); HelloWorldService service = (HelloWorldService) context.getService(reference); service.sayHello();