We will query the HTTP Invoker service of the previous Creating an HTTP Invoker service recipe.

We need the UserService interface so that our application knows the methods available on the HTTP Invoker service:

public interface UserService {
  public abstract List<User> findAll();
  public abstract void addUser(User user);
}

User objects will be exchanged over the network, so we need the User class of the previous recipe as well:

public class User implements Serializable {    
  private String name;
  private int age;
  
  public User(String name, int age) {
    this.name = name;
    this.age = age;
  }

  // ... getters and setters
}

Here are the steps for using an HTTP Invoker service: