We have put together another whitepaper to help when using the Groovy language in making customizations to pages and fields using Application Composer. This was done in response to observing the online forums and the requests logged with Oracle Support. It covers many common requirements and provides short illustrative examples.We hope you find it useful.
And just like with our EL whitepaper it will get regularly updated, so if you have any other examples please pass them on either via email or in the comments box below.