Java Message Service

Java Message Service (JMS) (Wikipedia), one of the Java Technologies, is an API that enables a Java EE application to interface with a queued messaging system such as WebSphere MQ. A JMS application uses resource references to accesses the messaging system as administered objects registered in JNDI.

WebSphere MQ has an optional JMS API that enables it to act as a JMS provider.

I have a JMS thread on my blog. A good way to learn about how to integrate applications using a JMS messaging system is the book Enterprise Integration Patterns.