What are your favorite Grails debugging tricks? [closed]

Answer 1

Here's some tricks collected by @groovymag from Grails people in twitter:

http://blog.groovymag.com/2009/02/groovygrails-debugging/

Answer 2

For simple applications I use println statement.It is very very easy trick.For complex applications use debug mode in intellij idea.

Answer 3

I'm not sure if this can be done out-of-the-box, but in webapps I find it useful to have a "who am I?" facility in the various view files.

The idea is to emit a message into the rendered HTML, to identify the fragment. This is especially true when I am encountering an app for the first time.

In Grails, I do this with a custom tag. For example, consider list.gsp for a Student:

<g:debug msg="student list" />

Here is the code:

class MiscTagLib {
    def debug = { map ->
        if (grailsApplication.config.grails.views.debug.mode == true) {
            def msg = map['msg']
            out << "<h2>${msg}</h2><br/>"
        }
    }
}

The key is that you can leave those tags in there, if desired, as they only appear in when the mode is enabled in Config.groovy:

grails.views.debug.mode=true