Moxy JAXB json mapping in Jersey returns 415

Question

I have a Jersey2 service with a POST method handler

@Path("register")
public class RegisterResource {
    @XmlRootElement
    class PostUserParams {
        String username;
        String password;

        public PostUserParams() {}
    }


    @POST
    @Consumes(MediaType.APPLICATION_JSON)
    public postData(PostUserParams user) {
    ...
    }
}

But I can't get the POST request to work - I already get 415 Unsupported Media Type. I'm pretty sure that

I have the correct Content-Type in the request
moxy, jaxb and all the jars and dependencies are properly deployed
I even tried to add some moxy configuration for jersey, but that doesn't seem to be necessary according to the docs
other requests not involving JSON to Java conversion work fine
the JSON in the request is correct

What gives?

Roman Plášil Roman Plášil · Accepted Answer · 2014-02-13T09:31:36

After a lot of digging and debugging (Jersey debugging makes me dizzy!) I found an exception which was unfortunately swallowed inside of these libraries.

The bean class, PostUserParams in this case, must have a parameterless constructer. I have that, but the class is not static and therefore Java doesn't treat it as such.

Solution: make PostUserParams static. Or put it outside the resource class.

Moxy JAXB json mapping in Jersey returns 415

1 Answers