Już za miesiąc GeeCON w KrakowieGeeCON in Kraków, only one month left

Rejestracja trwa. W tym roku ta – jedna z najważniejszych w Polsce – konferencja javowa świętuje swoje piąte urodziny. Część naszego zespołu wybiera się do Krakowa w dniach 15-17 maja. A Wy?Registration is going on. One of the most important in Poland Java conference celebrates 5th birthday this year. A part of TouK team will be there 15-17 May, will you?

Rejestracja trwa. W tym roku ta – jedna z najważniejszych w Polsce – konferencja javowa świętuje swoje piąte urodziny. Część naszego zespołu wybiera się do Krakowa 15-17 maja. A Wy? GeeCON 2013

Registration is going on. One of the most important in Poland Java conference celebrates 5th birthday this year. A part of TouK team will be there 15-17 May, will you?


GeeCON 2013

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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