Chapter 5. @QueryParam

The @QueryParam annotation allows you to map a URI query string parameter or URL form-encoded parameter onto your method invocation.

  GET /books?num=5

   @GET
   public String getBooks(@QueryParam("num") int num) {
   ...
   }

Since RESTEasy is built on a Servlet, it cannot distinguish between URL query strings and URL form-encoded parameters. As with @PathParam, the type of parameter can be a primitive, a String, or a class with a String constructor or static valueOf() method.