I am not a rails developer but I have seen that rails developer have alot of inertia and they won't switch to grails. Grails is only attracting Java developers

I am not a rails developer but I have seen that rails developer have alot of inertia and they won't switch to grails. Grails is only attracting Java developers who are fed up of exhaustive configurations. Unfortunately books written for grails also assume that you are switching from one of java to grails.