How do I get at the goodies in my Grails Config.groovy at runtime?

Question

In more recent versions of grails ConfigurationHolder has been deprecated.

Instead you should use the grailsApplication object.

grailsApplication.config.grails.serverURL

If in a Controller or Service then use dependency injection of grailsApplication object.
e.g.

class MyController{
    def grailsApplication
    def myAction() {
        grailsApplication.config.grails.serverURL
    }

See How to access Grails configuration in Grails 2.0?