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Figure 1.1 shows a high-level overview of the Fuse ESB Enterprise container architecture, showing the variety of deployment models that are supported.

Fuse ESB Enterprise is a multi-faceted container that supports a variety of deployment models. You can deploy any of the following kinds of deployment unit:

The Spring framework is a popular dependency injection framework, which is fully integrated into the Fuse ESB Enterprise container. In other words, Spring enables you to create instances of Java objects and wire them together by defining a file in XML format. In addition, you can also access a wide variety of utilities and services (such as security, persistence, and transactions) through the Spring framework.

The blueprint framework is a dependency injection framework defined by the OSGi Alliance. It is similar to Spring (in fact, it was originally sponsored by SpringSource), but is a more lightweight framework that is optimized for the OSGi environment.

At its heart, Fuse ESB Enterprise is an OSGi container, based on Apache Karaf, whose architecture is defined by the OSGi Service Platform Core Specification (available from OSGi is a flexible and dynamic container, whose particular strengths include: sophisticated management of version dependencies; sharing libraries between applications; and support for dynamically updating libraries at run time (hot fixes).

For more details about the OSGi framework, see Introduction to OSGi.

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