Producing JSON Response with RESTEasy and Jettison

RESTEasy is JBOSS provided implementation of JAX-RS specification for building RESTful Web Services and RESTful Java applications. Though this is not limited to be used in JBOSS only, and you can use with other servers also.

Jettison is a collection of Java APIs (like STaX and DOM) which read and write JSON. It is done using marshalling and and unmarshalling features.

In this post, I am demonstrating the way to use Jettison with RESTEasy, to convert the API response in json format.

Environment used:

  1. RESTEasy 2.3.1.GA
  2. RESTEasy Jettison provider 2.3.1
  3. Tomcat 7
  4. JDK 1.6

Follow below steps to build a demo application.

1) Create a maven project and convert to eclipse web project

mvn archetype:generate -DgroupId=com.howtodoinjava -DartifactId=RESTfulDemoApplication 
-DarchetypeArtifactId=maven-archetype-webapp -DinteractiveMode=false

mvn eclipse:eclipse -Dwtpversion=2.0

2) Update runtime dependencies in pom.xml

<project xmlns="" xmlns:xsi=""
  <name>RESTfulDemoApplication Maven Webapp</name>
    <!-- core library -->
	<!-- Jettison support -->

3) Update web.xml file for resteasy specific servlet mapping

 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "" >

  	<display-name>Archetype Created Web Application</display-name>
  	<!-- Auto scan REST service -->

4) Write a service class and model class

package com.howtodoinjava.model;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name = "user")
public class User implements Serializable {
    private static final long serialVersionUID = 1L;
    @XmlAttribute(name = "id")
    private int id;
    @XmlElement(name = "firstName")
    private String firstName;
    @XmlElement(name = "lastName")
    private String lastName;
    public int getId() {
        return id;
    public void setId(int id) { = id;
    public String getFirstName() {
        return firstName;
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    public String getLastName() {
        return lastName;
    public void setLastName(String lastName) {
        this.lastName = lastName;

package com.howtodoinjava.service;


import com.howtodoinjava.model.User;

public class UserManagementModule
	public Response getUserById(@PathParam("id") Integer id)
		User user = new User();
		return Response.status(200).entity(user).build();

5) Run the application

When we deploy the above-built application in tomcat and hit the URL: "http://localhost:8080/RESTfulDemoApplication/user-management/users/10", below is the response.

RESTEasy + Jettison example
RESTEasy + Jettison example

Happy Learning !!

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12 thoughts on “Producing JSON Response with RESTEasy and Jettison”

  1. http status 500: Internal Server error running the same code. I am using tomcat 7 and I have downloaded the lib for jersey “jax-rs 2.22.1”. I am not using maven. Can you suggest what must be the error.

  2. i am getting following error :

    Could not find MessageBodyWriter for response object of type: com.howtodoinjava.model.User of media type: application/json

    • Make sure you have following dependencies:




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