A hypothetical resource of books

Books.java

@Path("books")
public class Books{
    @Produces("application/json")
    @GET
    public List<Book> findAll(){
        //find all books
    }
    @Produces("application/json")
    @GET
    @Path("{id}")
    public Book findById(@PathParam("id") String bookId){
        //find book by id e.g. /books/123
    }
    @Produces("application/json")
    @GET
    public Book findByISBN(@QueryParam("isbn") String bookISBN){
        //find book by ISBN e.g. /books?isbn=xyz
    }
}