Grails as a pure REST backend good? Having technical difficulties to follow the documentation.

[martin...@n-xt.de]

Dear all,

(1) I had been working with Grails many years back. Looking for a good backend framework now (frontend will use angular.js). My first question is whether Grails is still a good choice to provide pure REST services?

(2) I tried to follow the documentation (section 9.1.5.1). I have created a domain class called "Restaurant" having two attributes (title, website). Then I have created a RestaurantController having following code:

import grails.rest.RestfulController
import grails.transaction.*

@Transactional(readOnly = false)
class RestaurantController extends RestfulController  {

  static responseFormats = ['xml', 'json']

  RestaurantController() {
    super(Restaurant)
  }

}

I have sent a POST request to the URI "http://localhost:8080/restaurant" with following content "title=Asia+Imbiss&website=www.asia-imbiss.com". But no matter which URL I use I get a java.lang.NullPointerException exception caused by Cannot invoke method count() on null object (see screenshot). What am I doing wrong here?

Btw: If I don't create a controller and use the @Resource(uri='/restaurant')like stated in 9.1.1, it works fine!

[martin...@n-xt.de]

I think i found the issue. It is workign, however, not with the URIs provided in the documentation:

If I want to save a new entry, I need to request the URI "/restaurant/save" and if I want to view an existing data set I need to request e.g. "/restaurant/show/1"

[Jeff Scott Brown]

> On Jan 22, 2016, at 5:16 AM, martin...@n-xt.de wrote:
>
> I think i found the issue. It is workign, however, not with the URIs provided in the documentation:
>
>
>
>
>

> If I want to save a new entry, I need to request the URI "/restaurant/save" and if I want to view an existing data set I need to request e.g. "/restaurant/show/1”
>

I expect you have a problem with your url mappings. You probably want something like this…

“/restaurants"(resources: ‘restaurant’)

See https://github.com/jeffbrown/restaurants.



JSB
—
Jeff Scott Brown
Principal Software Engineer
Grails Development Team
Object Computing Inc.
http://www.ociweb.com/

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