DDevelopment & Design

TouK on WGK 2011 – update

I National Conference on Computer Games Development in Gdańsk is officially over. Three days with polish game dev, technical lectures and challenging 8 hour game programming contest. TouK as one of the lecturers presented comparison between two worlds: “Developing business web applications and producing rich browser based games”. Both, media presentation and technical paper are available below (polish version only) WGK 2011 was also first spot where gamers and developers could check out “Project Ark” – rich space MMO browser web game project, based on open Java solutions (GWT, Spring, Hibernate) and common web standards (HTML/CSS/javascript). Project is developed in spare time by small team of coworkers of TouK. We will try to add some media presentation soon.

Technical paper

[Media presentation

]

2 Technical paper summary:

> Development process comparison between business web application and advanced browser based games. Presentation will touch many aspects of development process starting from analysis and technical design, through implementation, testing and final deployment, with attention to project management and business model. Very important part of presentation will discuss Open Source solutions and consequences of their use. Web game development process will be presented on example of ongoing Project Ark. It is rich space MMO browser web game project, based on open Java solutions and common web standards (HTML/CSS/javascript). It is developed in spare time by small team of coworkers of TouK IT company (www.touk.pl). >

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DDevelopment & Design

Grails render as JSON catch

One of a reasons your controller doesn't render a proper response in JSON format might be wrong package name that you use. It is easy to overlook. Import are on top of a file, you look at your code and everything seems to be fine. Except response is still not in JSON format.

Consider this simple controller:

class RestJsonCatchController {
def grailsJson() {
render([first: 'foo', second: 5] as grails.converters.JSON)
    }

def netSfJson() {
render([first: 'foo', second: 5] as net.sf.json.JSON)
    }
}

And now, with finger crossed... We have a winner!

$ curl localhost:8080/example/restJsonCatch/grailsJson
{"first":"foo","second":5}
$ curl localhost:8080/example/restJsonCatch/netSfJson
{first=foo, second=5}

As you can see only grails.converters.JSON converts your response to JSON format. There is no such converter for net.sf.json.JSON, so Grails has no converter to apply and it renders Map normally.

Conclusion: always carefully look at your imports if you're working with JSON in Grails!

Edit: Burt suggested that this is a bug. I've submitted JIRA issue here: GRAILS-9622 render as class that is not a codec should throw exception