Messaging exception (com.sun.jersey.api.MessageException) while querying Jersey REST service

Question

Context: -- Given the following code I am getting exception. Please tell me why is it happening with clear explanation:

@GET
@Produces("application/xml")
public List getEmployee()
{
   List<Employee> emp=new ArrayList<Employee>();
   return emp;
}

@XmlRootElement
public class Employee{

}

When I am calling getEmployee service I am getting following exception:

Caused by: com.sun.jersey.api.MessageException: A message body writer for Java class java.util.ArrayList, and Java type interface java.util.List, and MIME media type application/xml was not found ... 30 more

Thanks

Add the generic parameter type to your List return type.

Perception
– Perception

2012-11-15 12:48:31 +00:00
Commented Nov 15, 2012 at 12:48 — Perception
– Perception, Commented Nov 15, 2012 at 12:48

Lokesh Gupta · Accepted Answer · 2012-11-27 10:38:37Z

You are retuning a list of Employees which an instance of ArrayList. You declared root annotation on Employee class not on arraylist.

You need to create a wrapper for holding the list of employees. This wrapper will enable you to create root element for list i.e.

import java.util.ArrayList;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlAccessorType(XmlAccessType.NONE)
@XmlRootElement(name = "users")
public class Users {

    @XmlElement(name="user")
    private ArrayList users;

    public ArrayList getUsers() {
        return users;
    }

    public void setUsers(ArrayList users) {
        this.users = users;
    }
}

Please refer to below tutorial for more understanding

http://howtodoinjava.com/2012/11/26/writing-restful-webservices-with-hateoas-using-jax-rs-and-jaxb-in-java/

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