Functional Programming for Java Developers
Dean Wampler
Practical JIRA Plugins
Matthew B. Doar
Getting Started with Roo
Josh Long & Steve Mayzak
Java Network Programming
Elliotte Rusty Harold
Java EE 6 Pocket Guide
Arun Gupta
Programming Hive
Edward Capriolo, Dean Wampler & Jason Rutherglen
Scala Cookbook
Alvin Alexander