Step 2: Transform the Java class in a web service

To transform the previous java class in a Web Service, simply add a WebService annotation:
@WebService(targetNamespace = http://www.mycompany.com/barcode ",
  name="Barcode",
  serviceName="BarcodeService")
public class BarcodeService{
...
}

This defines all public and non static methods of the class as operations of the BarcodeService Web Service.