Preface
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## Preface

Increasing complexity in modern enterprise applications is a fact of life. Developers not only have to deal with complex business logic, but also a myriad of other concerns such as security, auditing, exposing business functionality to external applications, and managing the evolution of these concerns. The Spring Framework addresses these needs by offering a Plain-Old Java Object (POJO) based solution that lets you focus on your business logic.

Complex applications pose problems that go beyond using the right set of technologies. You need to take into account other considerations such as a simplified development process, easy deployment, monitoring deployed applications, and managing changes in response to changing business needs. This is where the Virgo Server comes into play. It offers a simple yet comprehensive platform to develop, deploy, and service enterprise applications. In this Programmer Guide, we explore the runtime portions of the Virgo Server, the Virgo Tomcat Server, Virgo Jetty Server and the Virgo Kernel, and learn how to develop applications to benefit from their capabilities.

## A Note to Virgo Kernel Programmers

Although this guide is written primarily for Virgo Tomcat Server programmers, much of it is also useful for Virgo Kernel programmers who should simply ignore the web-related sections.

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Virgo Programmer Guide | Home | 1. Prerequisites