Hello Andrew,
I hate to give you this answer, but unfortunately no, there was enough material to cover just going over the features of the framework in the depth I felt was sensible that we didn't cover Spring Sec's integration with other major frameworks. This was an unfortunate choice, because I personally have used Spr Sec in
JSF and Wicket projects successfully (though not Grails) and would have loved to have cover these. I'm hopeful that this will be adequately covered in the near future by myself or another aspiring author
The book should certainly give you a very thorough understanding of Spring Security and how it works, so at least conceptually, the book should give you a good foundation for integrating into whatever UI framework you choose to support.
Hope that answers your question?
Best,
Peter
Author, Spring Security 3 (the Book), Packt Publishing, 2010
SCJP, OCP