code: @Transformer(from = "java:org.jboss.resteasy.client.core.BaseClientResponse")
      public Item transform(BaseClientResponse<Item> from) {
          from.setReturnType(Item.class);
          return (Item) from.getEntity();
      }
docs: Transform from a RESTEasy Response to an Item instance.
  <p/>
  No need to specify the "to" type because Item is a concrete type.
  
  @param from Response object.
  @return Item instance.