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| </script><!--End Google Analytics code--></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">6. Case Study: Migrating the Form Tags Sample Application</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch05s02.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="ch06s02.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="formtags-case-study"></a>6. Case Study: Migrating the Form Tags Sample Application</h2></div></div></div><p> | |
| In this chapter we will walk through the steps needed to migrate the | |
| Form Tags sample application from a standard Java EE WAR to a fully | |
| OSGi | |
| compliant | |
| <span class="emphasis"><em>Shared Services WAR</em></span> | |
| within a PAR. | |
| The migration involves four packaging and deployment | |
| formats: | |
| </p><div class="orderedlist"><ol type="1"><li><p> | |
| <a class="link" href="ch06s02.html" title="6.2 Form Tags WAR">Standard WAR</a> | |
| </p></li><li><p> | |
| <a class="link" href="ch06s03.html" title="6.3 Form Tags Shared Libraries WAR">Shared Libraries WAR</a> | |
| </p></li><li><p> | |
| <a class="link" href="ch06s04.html" title="6.4 Form Tags Shared Services WAR">Shared Services WAR</a> | |
| </p></li><li><p> | |
| <a class="link" href="ch06s05.html" title="6.5 Form Tags PAR">PAR with a shared services WAR</a> | |
| </p></li></ol></div><p> | |
| </p><p> | |
| Each of these migration steps will produce a web application | |
| that | |
| can be deployed and run on the VTS. | |
| </p><p> | |
| After summarising the process, an example | |
| <code class="literal">plan</code> | |
| is shown which is another way of | |
| packaging and deploying the application. | |
| </p><p> | |
| The following image displays the directory structure you should have | |
| after installing the Form Tags sample. Note however that the release | |
| tag | |
| will typically resemble | |
| <code class="literal">3.0.0.RELEASE</code> | |
| . | |
| </p><p> | |
| <img src="images/formtags-case-study-sample-layout.png"> | |
| </p><p> | |
| The | |
| <code class="literal">dist</code> | |
| directory contains the distributables, | |
| and the | |
| <code class="literal">projects</code> | |
| directory contains the source code | |
| and build scripts. | |
| </p><p> | |
| For simplicity, this chapter will focus on the distributables—which | |
| are built using Virgo-Build | |
| rather than on configuring a project in an | |
| IDE. | |
| </p><div class="tip" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Tip"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="images/tip.gif"></td><th align="left">Tip</th></tr><tr><td align="left" valign="top"> | |
| Pre-packaged distributables are made available in the | |
| <code class="literal">dist</code> | |
| directory; | |
| however, if you would like to modify the samples or build | |
| them from scratch, you may | |
| do so using Virgo-Build. Take a look at | |
| the | |
| <code class="literal">README.TXT</code> | |
| file in each of the folders under | |
| the | |
| <code class="literal">projects</code> | |
| directory in the | |
| Form Tags sample for instructions. | |
| </td></tr></table></div><p> | |
| </p><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="formtags-case-study-introduction"></a>6.1 Overview of the Form Tags Sample Application</h2></div></div></div><p> | |
| The sample that we will be using is the Form Tags show case | |
| sample | |
| which was provided with Spring 2.0. The Form Tags application | |
| has | |
| been removed from the official Spring 2.5.x distributions; | |
| however, | |
| since it is relatively simple but still contains enough | |
| ingredients | |
| to demonstrate the various considerations required during | |
| a migration, | |
| we have chosen to use it for these examples. | |
| </p><p> | |
| The purpose of the Form Tags show case sample was to demonstrate how | |
| the Spring specific | |
| <code class="literal">form:</code> | |
| tags, released | |
| in Spring 2.0, make view development with JSPs and tag | |
| libraries easier. | |
| The Form Tags application consists of a single | |
| <code class="literal">UserService</code> | |
| which returns a list | |
| of | |
| <code class="literal">Users</code> | |
| . Furthermore, the application demonstrates how to list, view, | |
| and | |
| edit | |
| <code class="literal">Users</code> | |
| in a simple Spring MVC based web application using JSP | |
| and JSTL. | |
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