GET request to a RESTful resource results in MessageBodyWriter not found

Question

I'm trying to learn the implementation of RESTful Web services using JAX-RS.

I have a class called MovieObject that contains basic info about movies & a class called ResourceHandler that takes care of the request and sends the response.

Following is my MovieObject.java

package org.auro.self.movielib.resource;

public class MovieObject {

    private String movieName;
    private String yearOfRelease;
    private int movieRating;

    public MovieObject(){

    }

    public MovieObject(String movieName, 
            String yearOfRelease, 
            int movieRating){

        this.movieName = movieName;
        this.yearOfRelease = yearOfRelease;
        this.movieRating = movieRating;
    }

    public String getMovieName(){
        return movieName;
    }


    public String getYearOfRelease(){
        return yearOfRelease;
    }

    public int getMovieRating(){
        return movieRating;
    }
}

Following is my ResourceHandler.java

package org.auro.self.movielib.resource;

import java.util.ArrayList;
import java.util.List;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

@Path("/message")
public class ResourceHandler {

    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public List<MovieObject> getListOfMovies(){
        MovieObject mv1 = new MovieObject("The Independence Day 1", "1996", 7);
        MovieObject mv2 = new MovieObject("The Independence Day 2", "2016", 4);

        List<MovieObject> listOfMovies = new ArrayList<MovieObject>();

        listOfMovies.add(mv1);
        listOfMovies.add(mv2);

        return listOfMovies;
    }

}

Following is my index.jsp

<html>
<body>
    <h2>Jersey RESTful Web Application!</h2>
    <p><a href="webapi/myresource">Jersey resource</a>
    <p>Visit <a href="http://jersey.java.net">Project Jersey website</a>
    for more information on Jersey!

    <p> Get Movies <a href="webapi/message"> here</a>
</body>
</html>

And finally, the web.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- This web.xml file is not required when using Servlet 3.0 container,
     see implementation details http://jersey.java.net/nonav/documentation/latest/jax-rs.html -->
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <servlet>
        <servlet-name>Jersey Web Application</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>jersey.config.server.provider.packages</param-name>
            <param-value>org.auro.self.movielib</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Jersey Web Application</servlet-name>
        <url-pattern>/webapi/*</url-pattern>
    </servlet-mapping>
</web-app>

If you look at my index.jsp , you will notice that any request to <p> Get Movies <a href="webapi/message"> here</a> is actually taken care of by ResourceHandler.java

A GET request to that class should return a list of movies as plain text, but I end up getting an HTTP Status 500 - Internal Server Error

And this is what I get in my console

INFO: Server startup in 2430 ms
Aug 20, 2016 11:52:58 PM org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor aroundWriteTo
SEVERE: MessageBodyWriter not found for media type=application/xml, type=class java.util.ArrayList, genericType=java.util.List<org.auro.self.movielib.resource.MovieObject>.

Is there anything I'm missing that's causing this error?

Answer 1

This is content negotiation problem (misscommunication).

You should either change your application to return xml instead of TEXT_PLAIN :

 @Produces({ MediaType.APPLICATION_XML })

or invoke your service with request containing Accept: text/plain header (by default it's Accept:text/html,application/xml or something like that)

You could also try url-based content negotiation, but this is AFAIK only Resteasy feature:

https://docs.jboss.org/resteasy/docs/3.0.6.Final/userguide/html/JAX-RS_Content_Negotiation.html

GET request to a RESTful resource results in MessageBodyWriter not found

Question

1 answers

solution1
0 2016-08-20 20:28:08

GET request to a RESTful resource results in MessageBodyWriter not found

Question

1 answers

solution1 0 2016-08-20 20:28:08

solution1
0 2016-08-20 20:28:08