anchor.diff:  ....
   package echo;
   
  -@javax.jws.WebService
  +@jakarta.jws.WebService
   public class Echo
   {
      public String echo(String input)
  
positive.code: _web.xml_ needs to be created:
  
  ....
  <web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
    version="2.4">
  
    <servlet>
      <servlet-name>Echo</servlet-name>
  
negative.code: ....
  package echo;
  
  @jakarta.jws.WebService(endpointInterface="echo.Echo")
  public class EchoImpl implements Echo
  {
     public String echo(String arg0)
  