| <html><head><META http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Preface</title><meta content="DocBook XSL Stylesheets V1.76.0" name="generator"><link rel="home" href="index.html" title="Virgo Programmer Guide"><link rel="up" href="index.html" title="Virgo Programmer Guide"><link rel="prev" href="index.html" title="Virgo Programmer Guide"><link rel="next" href="ch01.html" title="Chapter 1. Prerequisites"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table summary="Navigation header" width="100%"><tr><td align="left" width="20%"><a accesskey="p" href="index.html">Prev</a> </td><th align="center" width="60%"> </th><td align="right" width="20%"> <a accesskey="n" href="ch01.html">Next</a></td></tr></table><hr></div><div class="preface" title="Preface"><div class="titlepage"><div><div><h2 class="title"><a name="preface"></a>Preface</h2></div></div></div><p> | |
| 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. | |
| </p><p> | |
| 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 Server for Apache Tomcat, Virgo Jetty Server and the | |
| Virgo Kernel, and learn how to develop applications to benefit from their | |
| capabilities. | |
| </p><div class="simplesect" title="A Note to Virgo Kernel Programmers"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="N10056"></a>A Note to Virgo Kernel Programmers</h2></div></div></div><p> | |
| Although this guide is written primarily for Virgo Server for Apache Tomcat programmers, much of it is also useful for | |
| Virgo Kernel programmers who should simply ignore the web-related sections. | |
| </p></div><div class="simplesect" title="A Note to Virgo Nano Programmers"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="N1005B"></a>A Note to Virgo Nano Programmers</h2></div></div></div><p> | |
| This guide is written primarily for Virgo Server for Apache Tomcat programmers. Although a base version of Virgo Nano, without the new provisioning | |
| system, is used to build the Virgo Server for Apache Tomcat, much of this guide does not apply to Virgo Nano. The VN lacks regions support but has much | |
| improved runtime footprint and startup time and also provides support for p2 provisioning. The Virgo Nano features are covered better in the | |
| <a class="ulink" href="../../virgo-user-guide/html/index.html" target="_top">User Guide</a>. | |
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