Browsing through the Grails site, I noticed they have a plugin for Flex so I figured I'd try it out.
Following the instructions, I installed the plugin (grails install-plugin flex) which took a fair while to fetch the plugin from the codehaus.org site and build it and install it into my project. Then I created a service class - a regular Groovy class - with just this one additional line:
Then I put my main.mxml file in the web-app directory of my Grails project with these lines inside the mx:Application tag:
<mx:Button label="Hello" click="ro.hello()"/>
<mx:TextInput text="{ro.hello.lastResult}"/>
Then I hit the MXML file in my Grails app:
http://localhost:8080/bookstore/main.mxml
Much churning ensued as the Flex app was compiled on demand and then up it came with the Hello button. Click. The return value from my HelloService.groovy hello() appeared in the text box.
It's a trivial app but it showed just how incredibly seamless the integration is. It uses the Web Tier Flex compiler for on-demand MXML compilation and it automatically manages the destinations for you.
