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I was fortunate enough to be able to start fresh with Grails. However, many people have asked me how to add Groovy and/or Grails to a legacy Java/JSP web app. Do people have experience or recommendations on how to best include Groovy and Grails into a large legacy application?
This IBM Developerworks article goes into detail about how to use Grails with your legacy database.
A tool that may help map legacy databases to grails domain objects is GRAG – the Grails Application Generator. It’s a handy tool that helps generate the mapping classes for you.
A third option is to not use Grails for the gorm/domain layer. Instead, because it’s works so well with Java, you can create services that call your existing legacy Java code for business logic and persistence.
I hope one of these approaches works for you.