DDevelopment & Design

Error generating web.xml file with IntelliJ IDEA

If you use IntelliJ IDEA for your Grails development you might encounter this error running integration tests: Error Error generating web.xml file (Use –stacktrace to see the full trace) The reason for this is that IDEA adds classpath by default on cr…

If you use IntelliJ IDEA for your Grails development you might encounter this error running integration tests:

Error Error generating web.xml file (Use --stacktrace to see the full trace)

The reason for this is that IDEA adds classpath by default on creating integration test run configuration. Unfortunately, sometimes it causes strange errors like this one. Follow these steps to resolve:

  1. Open Run → Edit Configurations… (or press Alt-Shift-F10)
  2. Select your configuration that fails
  3. Uncheck Add –classpath checkbox
  4. You are done! Run.

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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

DDevelopment & Design

micro-burn has Trello integration

After a few long evenings I've finally integrated micro-burn with Trello. All you need to run it for your Trello board is to write short configuration and run fat jar. It renders burndown chart visualising progress of cards on your board.You can specif...After a few long evenings I've finally integrated micro-burn with Trello. All you need to run it for your Trello board is to write short configuration and run fat jar. It renders burndown chart visualising progress of cards on your board.