[Rest-Dispatch] Cannot instantiate sub resource.

[Richard Wallis]

During deserialization gwt-jackson throws an error: Can't instantiate ChanceResource.

I've copied the pattern from CarStore where CarsResource returns the subresource CarResource but must have missed something..


ChanceResource is an interface so obviously can't be instantiated but in CarStore CarResource is the same and works fine:

Here are the relevant jax-rs interfaces.  All the calls work fine on the server.

@Produces(MediaType.APPLICATION_JSON)
public interface BaseResource<T extends MPEntity<T>> {
   
    @GET
    List<T> getAll();
   
    @GET
    @Path(ApiPaths.ID)
    T get(@PathParam(Param.ID) String id);
   
    @GET
    @Path("/" + Param.COUNT)
    int count();
   
    @POST
    T save(T entity);
   
    @DELETE
    void delete(T entity);
   
}

@Path(ApiPaths.GAME)
@Produces(MediaType.APPLICATION_JSON)
public interface GameResource extends BaseResource<Game> {

    @Path("/{" + Param.GAME_ID + "}" + ApiPaths.CHANCE)
    @GET
    ChanceResource getChanceResource(@PathParam(Param.GAME_ID) String gameId);
   
}

@Produces(MediaType.APPLICATION_JSON)
public interface ChanceResource extends BaseResource<Chance> {

}

Any suggestions?

[Christopher Viel]

Remove the @GET from the SubResource method:

    @Path("/{" + Param.GAME_ID + "}" + ApiPaths.CHANCE)

    ChanceResource getChanceResource(@PathParam(Param.GAME_ID) String gameId);

Rest Dispatch interprets actions end-points before sub resources and HTTP verbs are what is used to find those.

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[Richard Wallis]

Awesome that fixes it.  Thanks Chris