POST to Jersey REST service getting error 415 Unsupported Media Type

I am using a JAX-RS web application with Jersey and Tomcat. Get requests are fine however when I try to post JSON I get an HTTP status 415 - Unsupported Media Type.

Here is my simple HelloWorld.java:

package service;

import javax.ws.rs.*;

@Path("hello")
public class HelloWorld {
    @GET
    @Produces("text/plain")
    public String get() {
        return "hello world";
    }

    @POST
    @Consumes("application/json")
    public String post(JS input) {
        return input.hello;
    }

    public static class JS {
        public String hello;
    }
}

Here is the request I try in Postman (with 'application/json' header):

Here is the project layout with libraries:

I am using:

• Java 7 x64
• Jersey 2.17
• Tomcat 7.0.62 x64

Thanks!

The Jersey distribution doesn't come with JSON/POJO support out the box. You need to add the dependencies/jars.

Add all these

• jersey-media-json-jackson-2.17
• jackson-jaxrs-json-provider-2.3.2
• jackson-core-2.3.2
• jackson-databind-2.3.2
• jackson-annotations-2.3.2
• jackson-jaxrs-base-2.3.2
• jackson-module-jaxb-annotations-2.3.2
• jersey-entity-filtering-2.17

With Maven, below will pull all the above in

<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-json-jackson</artifactId>
    <version>2.17</version>
</dependency>

For any future readers not using Jersey 2.17 (and using jars directly instead of Maven), you can go here to find the Jersey version you are using, and see what transitive dependency versions you need. The current version of this Jersey dependency uses Jackson 2.3.2. That's the main thing you need to look out for.

Gone through a lot of the answers both on this page and others but to no avail. This actually worked for me:

METHOD 1: Instead of passing JSONObject as parameter to the resource method, pass a String rather. Take the String and create an JSONObject with it and then you can use it in you code. Like so,

    @Path("/people")
    @POST
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    public Response doGetperson(String jsonRequest) {
        try { 
            JSONObject requestedJSON = new JSONObject(jsonRequest);

            //So now you can use requestedJSON object created to do your stuff

            return Response.ok("{\"name\":" + requestedJSON.getString("user") + "}").build();
        } catch (Exception ex) {  
            return Response.ok("{ \"name\":\"\"}").build();
        } 
    }

METHOD 2:

Adding this dependency as of September, 2017:

<!-- https://mvnrepository.com/artifact/org.glassfish.jersey.media/jersey-media-moxy -->
<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-moxy</artifactId>
    <version>2.26</version>
</dependency>

Reference from here

Check your REST call contentType. It should be contentType: 'application/json', if you are passing json data to POJO class.