Geek asks and answers

Jersey throws an unexpected media type by default when throwing a WebApplicationException

I am developing a web service using the JAX-RS API with Jersey 1.17 as my implementation.

I want clients to have a choice between the JSON and XML that they specify using the AcceptHTTP header . I want JSON to be the default when the client does not include the header Acceptin the request. I tried to achieve this by posting MediaType.APPLICATION_JSONup MediaType.APPLICATION_XMLin the annotation Produces.

This seems to work in normal situations:

$ curl 'http://localhost:8080/webservice/Bob'
{"text":"Hello, Bob"}

$ curl -H'Accept: application/json' 'http://localhost:8080/webservice/Bob'
{"text":"Hello, Bob"}

$ curl -H'Accept: application/xml' 'http://localhost:8080/webservice/Bob'
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><Greeting text="Hello, Bob"/>

But if I drop WebApplicationExceptionfrom the constructor of my resource class, the default media response type will match the XML:

$ curl 'http://localhost:8080/webservice/Vader'
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><Error message="Illegal name"/>

If the client includes a header Accept, the media type is correct:

$ curl -H'Accept: application/json' 'http://localhost:8080/webservice/Vader'
{"message":"Illegal name"}

, ?

( GitHub):

package org.example.errorhandling;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;

import org.example.errorhandling.repr.Error;
import org.example.errorhandling.repr.Greeting;

@Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
@Path("/{name}")
public class Greeter {
    private final String name;

    public Greeter(@PathParam("name") String name) {
        if ("Vader".equals(name)) {
            Error error = new Error();
            error.message = "Illegal name";
            Response errorResponse = Response.status(Status.BAD_REQUEST).entity(error).build();
            throw new WebApplicationException(errorResponse);
        } else {
            this.name = name;
        }
    }

    @GET
    public Response greet() {
        Greeting greeting = new Greeting();
        greeting.text = "Hello, " + name;
        return Response.ok(greeting).build();
    }
}
+3
2

- usul_.

selectVariant() , Accept . .

, ( GitHub):

public Greeter(@PathParam("name") String name, @Context Request request) {
    if ("Vader".equals(name)) {
        Error error = new Error();
        error.message = "Illegal name";
        List<Variant> variants = Variant.mediaTypes(MediaType.APPLICATION_JSON_TYPE, MediaType.APPLICATION_XML_TYPE).add().build();
        Variant variant = request.selectVariant(variants);
        Response errorResponse = Response.status(Status.BAD_REQUEST).entity(error).variant(variant).build();
        throw new WebApplicationException(errorResponse);
    } else {
        this.name = name;
    }
}
0

More articles:


All Articles