Currently I'm working on an Adobe Flex front-end which will communicate to Microsoft Team Foundation Server using some SOAP webservices.
As we are currently just concentrating on the Flex front-end, there are no TFS webservices available yet. This makes testing the Flex front-end somehow difficult. To make things easy we wanted to create some mock TFS webservices. This is when Grails comes is!
Within the hour we had the mock application running. Creating some basic domain classes, installing the xfire plugin and creating some services exposed as xfire webservices. And for verifying the data is stored correctly in the database we just used the generate-all command to create some basic CRUD views.
I know the Grails mock application will not see the production light, but creating quick mock applications for temporary usage is another thing in which Grails can be used very effectively.