I’ve had a number of students ask me about Java Message Service (JMS). They are eager to learn how to send/recieve messages using JMS. I’ve put together a list of free tutorial resources. Enjoys!
JMS Tutorial from Java EE 7 Tutorial
JMS Tutorial with ActiveMQ
And, if you are interested in using JMS with Spring then here are some good links
Getting Started with Spring JMS
Messaging with Spring JMS