programmer-guide/src/docs/asciidoc/preface.adoc

:virgo-name: Virgo
:version: 3.7.0.RELEASE

:umbrella-virgo-name: Eclipse Virgo
:tomcat-product-name: Virgo for Apache Tomcat
:tomcat-product-name-short: VTS
:jetty-product-name: Virgo Jetty Server
:jetty-product-name-short: VJS
:kernel-product-name: Virgo Kernel
:kernel-product-name-short: VK
:nano-product-name: Virgo Nano
:nano-product-name-short: VN
:user-guide: http://www.eclipse.org/virgo/documentation/virgo-documentation-${version}/docs/virgo-user-guide/html/index.html[User Guide]
:tooling-guide: http://www.eclipse.org/virgo/documentation/virgo-documentation-3.6.4.RELEASE/docs/virgo-tooling-guide/html/index.html[Tooling Guide]

:gemini-blueprint-guide: https://www.eclipse.org/gemini/blueprint/documentation/reference/2.0.0.RELEASE/html/index.html[Eclipse Gemini Blueprint Reference Guide]

:spring-framework-version: 4.2.9.RELEASE

:homepage: https://www.eclipse.org/virgo
:ebr: http://www.eclipse.org/ebr[EBR]

:imagesdir: assets/images

== 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 {umbrella-virgo-name} 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
{umbrella-virgo-name}, the {tomcat-product-name}, {jetty-product-name} and the
{kernel-product-name}, and learn how to develop applications to benefit from their
capabilities.

.For {kernel-product-name} Programmers
[NOTE]
--
Although this guide is written primarily for {tomcat-product-name} programmers, much of it is also useful for
{kernel-product-name} programmers who should simply ignore the web-related sections.
--

.For {nano-product-name} Programmers
[NOTE]
--
This guide is written primarily for {tomcat-product-name} programmers. Although a base version of {nano-product-name}, without the new provisioning
system, is used to build the {tomcat-product-name}, much of this guide does not apply to {nano-product-name}. The {nano-product-name-short} lacks regions support but has much
improved runtime footprint and startup time and also provides support for p2 provisioning. The {nano-product-name} features are covered better in the
{user-guide}.
--