Grails also allows you to map HTTP response codes to controllers, actions or views. All you have to do is use a method name that matches the response code you are interested in:
static mappings = {
"500"(controller:"errors", action:"serverError")
"404"(controller:"errors", action:"notFound")
"403"(controller:"errors", action:"forbidden")
}
Or alternatively if you merely want to provide custom error pages:
static mappings = {
"500"(view:"/errors/serverError")
"404"(view:"/errors/notFound")
"403"(view:"/errors/forbidden")
}