I tried the same and I can't even get marshalling working. The JAXB context
complain that the formal type is unknown.
On Thu, Oct 7, 2010 at 10:15 AM, Damiano ALBANI <
damiano.albani_at_univ-nantes.fr> wrote:
> Hello,
>
> I'd like to use Java generics in my JAX-RS project with Jersey, due to the
> way my ExtJS client requires XHR payloads to be formatted.
> Basically, that would consist of a very simple wrapper like:
>
> public class ExtJsWrapper<T> {
> public T rows;
> }
>
> Jersey is able to correctly marshall objects of such type, e.g.:
>
> @GET
> public ExtJsWrapper<Campagne> getCampagne() {
> Campagne campagne = ...
> return new ExtJsListWrapper<Campagne>(campagne);
> }
>
> Works fine, JSON/XML is generated when I fetch the resource by GET.
> Now, I found unmarshalling is a bit trickier, when I need to support
> generics as input parameters:
>
> @PUT
> @Path("{id}")
> public ExtJsWrapper<Campagne>
> updateCampagne(@PathParam("id") int idCampagne,
> ExtJsWrapper<Campagne> wrapper) {
> ...
> }
>
> With JSON, I found that I needed to specified a "type" property, otherwise
> Jersey would fail.
>
> curl -X PUT -H "Content-Type: application/json"
> -d '{ "rows": { "type":"campagne", "id":1, "code":"10-1" } }'
> http://localhost:8080/api/campagnes/2
>
> By the way, what's "funny" is that Jersey is picky about where the "type"
> property lies in the JSON !?
> For instance, this fails:
>
> curl -X PUT -H "Content-Type: application/json"
> -d '{ "rows": { "id":1, "code":"10-1", "type":"campagne" } }'
> http://localhost:8080/api/campagnes/2
>
> So, is there a way to avoid having to specify this type property in my JSON
> (or XML) data?
>
> After a bit of Googling, I've seen references to these 2 classes that might
> help:
> javax.ws.rs.core.GenericEntity<T>
> com.sun.jersey.api.client.GenericType<T>
>
> But how shall I use them in my code?
>
> Finally, I've got another blocking issue, this time with generics in the
> Jersey Client API.
> If I want to call the PUT method as shown above, how can I do it?
>
> I've tried things like:
>
> Campagne campagne = ...
>
> ressource.accept(MediaType.APPLICATION_JSON_TYPE)
> .type(MediaType.APPLICATION_JSON_TYPE)
> .put(new GenericType<ExtJsWrapper<Campagne>>() {}, campagne);
>
> Also tried playing with all sorts of combinations with
> GenericEntity/GenericType... without success :-(
> I keep on getting this exception:
>
> com.sun.jersey.api.client.ClientHandlerException:
> javax.ws.rs.WebApplicationException: javax.xml.bind.MarshalException
> - with linked exception:
> [javax.xml.bind.JAXBException: class fr.univNantes.spin.entities.Campagne
> nor any of its super class is known to this context.]
>
> Sorry for this long message but I couldn't find any solution even after
> many attempts...
>
> Thanks for your help,
>
> --
> Damiano ALBANI
>