Question

While using a Root- and SubResource in Jersey I annotated the RootResource like this to receive the form parameter param1.

@Path("some/path")
public SubResource doSomething(@FormParam("param1") String param1) {
...
}

Everything worked as I expected it to be, but, when the parameter is not given than jersey will return an internal error status code (500). In general I would say that this should be something like a bad request (400) or so.

What I then tried to do is, I added a MultivaluedMap<String, String> form into the parameter list (See: Jersey User Guide Example 2.19)

@Path("some/path")
public SubResource doSomething(MultivaluedMap<String, String> form) {
...
}

In this case I should be able to handle the form parameters for myself, but form did not get populated. Probably because of the missing @POST annotation.

My Question: Do you know a way, besides handling a HttpServletRequest which I find frustrating, so that I get my post parameters?

Thanks for your help…

Answer 1

I’m not entirely sure what you are trying to accomplish, but none of your examples seem valid to me. Since you are trying to pass processing onto a sub-resource you really should be dealing with the parameters there, instead of in the root resource. Heres an example:

@Path("/root/path")
public class RootResource {
    @Path("/sub/path")
    public SubResource doSomething() {
       // return an instance of your sub resource
    }
}

@Produces(MediaType.TEXT_XML, MediaType.APPLICATION_JSON)
public class SubResource {
    @GET
    @Path("/")
    public Collection<SomeBean> getAll() {}

    @GET
    @Path("/{id}
    public SomeBean getSingle() {}

    @POST
    @Path("/")
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    public SomeBean reallyDoSomething(@FormParam("param1") final String param) {
       // do ... something
    }
}

---

EDIT

If you need access to form parameters in order to initialize your sub resource then access them via the HTTP servlet request:

public class RootResource {
    @Context
    private HttpServletRequest request;

    @Path("/sub/path")
    public SubResource doSomething() {
        final Map<String, String> params = request.getParameterMap();
        // process the parameters 
        // return an instance of your sub resource
    }
}