Together, Flex and Java make a powerful web development platform—they blend the strengths of Java on the server with the richness of Flex on the frontend. Flex on Java is a unique book that teaches you how to work with Flex in concert with the full array of Java technologies: Spring, POJOs, JMS, and other standard tools. You also learn how to integrate Flex with server-side Java via BlazeDS remoting. Almost all the carefully annotated examples use free or open source software.