Make sure you return something from your grails actions!

In my grails application, I didn't understand how "index" action was being invoked from another action:

    def about = {

    }

    def index = {
      println "hello"

    }

Calling my "about" action was invoking the "index" action. Make sure you return something in your action if this is not your intention, Well this may seem like a "duh", when you got filters/actions and tons of stuff going on in your application, it took me a while to figure this out.

Here is correct way:

    def about = {
        [:]
    }

    def index = {
      println "hello"

    }