You can read this online (www.securingjava.com) however when you do, you find its a nice easy book thats worth having a hardcopy of (although bear in mind its not an advanced book on the subject) - www.amazon.co.uk/exec/obidos/ASIN/047131952X/okchickenltd
Java 2 Network Security
Haven't read this one, but it gets good reviews. Hopefully someone will give us a personal reference. www.amazon.co.uk/exec/obidos/ASIN/0130155926/okchickenltd
Prototype-Based Object-Oriented Programming : Concepts, Languages, and Applications (Editors: James Noble, Antero Taivalsaari, Ivan Moore)
Prototype-Based Programming is a variety of Object-Oriented Programming that is philosophically similar to XP; in particular, do the simplest thing (with objects) without having to define abstractions (classes) before you can do anything -