Simple Messaging Example using Hessian

According to Wikipedia, Hessian is a binary web service protocol that makes web services usable without requiring a large framework, and without learning a new set of protocols. Because it is a binary protocol, it is well-suited to sending binary data without any need to extend the protocol with attachments.

From what i’ve tested, perhaps it is somekind of light version of remote EJB3 because i dont have to include so many libraries like EJB3. Altough EJB3 and Hessian are not apple-to-apple comparable, because both arent using the same messaging protocol. EJB3 use RMI-IIOP while Hessian use WebService.

So let’s start with the code. First, for the server part (im using tomcat), create a web project on Netbeans 6.9 and creating a simple interface class,

package com.edw.service;

public interface HelloService {
    String sayHelloTo(String target);

after that, i create a simple servlet which implements HelloService interface,

package com.edw.servlet;

import com.caucho.hessian.server.HessianServlet;
import com.edw.service.HelloService;

public class HelloServlet extends HessianServlet implements HelloService {

    public String sayHelloTo(String target) {
        return "hello "+target+", have a nice day";

dont forget to register your servlet to web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="" xmlns:xsi="" xsi:schemaLocation="">

next, is creating the client application. I start with a simple java netbeans project, a main class and an interface, i copied the exact copy of HelloService and then put it on my client project,

package com.edw.service;

public interface HelloService {
    String sayHelloTo(String target);

and my main class

package com.edw.main;

import com.caucho.hessian.client.HessianProxyFactory;
import com.edw.service.HelloService;

public class Main {

    String url = "http://localhost:809/HessianServer/HelloServlet";
    HessianProxyFactory factory = new HessianProxyFactory();

    public Main() {

    private void doTest() {
        try {
            HelloService hello = (HelloService) factory.create(HelloService.class, url);
            System.out.println(hello.sayHelloTo("si pepe"));
        } catch (Exception e) {

    public static void main(String[] args) {
        Main main = new Main();

here is the screenshot of my project

This is what the messaging looks like

another good competitor for Spring Http Invoker.
Have fun ;-)


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