Apache Excalibur spun out of ApacheAvalon in 2004. Excalibur continues to develop the basic Avalon Framework and Excalibur platform including the Fortress IoC container.

Excalibur Explained

Excalibur is a platform for component and container applications built on key design patterns such as Inversion of Control and Separation of Concerns available for the Java platform. You can use Excalibur to build any number of other applications from desktop centric Swing apps to complicated servers. The Avalon Framework (the core of Excalibur) is often used as the "underpinning" of a larger application or platform. Such applications include Apache Cocoon, Apache James, and the Keel Framework.

What Excalibur Isn't

Excalibur is not part of the J2EE stack. While Excalibur can be used in developing J2EE applications and even used to build a J2EE server, the platform is not part of J2EE or a J2EE application server. Excalibur is much simpler and does not include many J2EE specifications out of the box. That said, you might write a J2EE application which embeds Excalibur (such as in a servlet) or you may embed a J2EE server in a larger Excalibur-based container.

What Excalibur Is

The Excalibur platform is the following:

When working with Excalibur you may use one or all of these. For more information on makeup of Excalibur, see the ExcaliburOverview.

Who Uses Excalibur?

Excalibur users generally find themselves in one or more of the following roles:

Regardless of your role, there are certain technologies and concepts which are essentially prerequisites to Excalibur development and use. If you are not familar with these terms, please read the corresponding documentation:

Why Use Excalibur?

First we need to answer a more basic question: why would I use a container? How does a container fit into my application?

To understand why someone would use Excalibur, let's look at some of the problems Excalibur solves.

How to Use Excalibur?

This is a question for another article: check out our FiveMinuteTutorial.

References

For more information, we recommend these articles:

AboutApacheExcalibur (last edited 2010-12-19 10:12:09 by CarstenZiegeler)