Lately I was using jetty 1.3.6 , created wars and deployed in the tomcat server installed in my machine. Now upgraded to 1.3.7 which has built-in tomcat and works fine. Now I want to change the port of this built-in instance so that I can still deploy created wars in my old tomcat on 8080.
I recommend just adding that port param into your IDE's run configs per project rather than trying to alter it permanently to one port number for all your grails apps. You may end up with several grails apps that you want to run at once in dev mode (think SOA), and running each on different ports is an easy way to do that.