Flex is now approaching its 4th version. Even since its start, it looked promising. Until some time ago, I didn’t look much into it for it was not Open enough. Two years ago, in order to use Flex application freely, you had to limit yourself to a little subset of Flex. This has changed. At the end of last year, though, my client gave me the opportunity to prototype a simple application and I dived into it. This development gave me an insight into BlazeDS, Spring BlazeDS and Flex itself.