120.  The Java Message Service

Rev. 1.1

 

This course is now available directly from our partner, Capstone Courseware.

This course teaches everything that most Java developers will need to know about asynchronous messaging using the Java Message Service, or JMS. Both the point-to-point and publish-and-subscribe messaging styles are covered, but there is an emphasis on the more popular point-to-point approach using message queues. The course moves quickly from JMS fundamentals -- connections, sessions, queues, topics, etc. -- to intermediate techniques such as message properties and selectors. By the end of the day, students will understand JMS reliability and be able to make intelligent architectural choices between delivery modes, acknowledgement modes, and transacted sessions.

 

LEARNING OBJECTIVES

 

·         Use JMS queues to manage message transmission between a single producer and a single consumer.

·         Use JMS topics to allow for broadcasting of messages in real time.

·         Use various JMS message types, including text, object, and map-based messages.

·         Set message headers and use properties to define additional information about messages.

·         Use message selectors to filter messages in consumption.

·         Trigger redelivery of messages using various acknowledgement modes and techniques.

·         Use JMS transactions to assure that message receipts and sends are grouped into atomic units of execution.

 

Course Duration:  1 day.

 

Prerequisites: 

·         Solid Java programming experience is required -- consider Course 103 or its equivalent a firm prerequisite.

·         An understanding of Java web applications will be helpful, but is not required.

 

1.      Fundamentals

Asynchronous Messaging

The Java Message Service

Point-to-Point Messaging

Publish-and-Subscribe Messaging

JNDI

Connections and Sessions

Working with Queues

Working with Topics

Expiration

 

2.      Message Content

Message Types

Header Fields

Properties

Message Selectors

 

3.      Reliability

Message Persistence

JMS from Web Applications

The Component Environment

Acknowledgement and Redelivery

Acknowledgement Modes

Session Recovery

Transactions

What JMS Transactions Are and Aren't

Transaction Pitfalls

Batch Processing

Priority

JMS and EJB: Message-Driven Beans

JMS and Web Services: SOAP Messaging

 

Appendix A.  Learning Resources

 

System Requirements

 

Hardware – minimal:                     500 MHz, 256 meg RAM, 500 meg disk space

 

Hardware – recommended:           1.5 GHz, 512 meg RAM, 1 gig disk space.

 

Operating system:                          Tested on Windows XP Professional. Course software should be viable on all systems which support the J2EE 1.4 reference implementation.

 

Software:                                       All free downloadable tools.