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			284 lines
		
	
	
		
			25 KiB
		
	
	
	
		
			HTML
		
	
	
	
	
	
<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Application Developer's Guide - Development Processes</title><meta name="author" value="Craig R. McClanahan"><meta name="email" value="craigmcc@apache.org"></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img src="../../images/tomcat.gif" align="right" alt="
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      The Apache Tomcat Servlet/JSP Container
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    " border="0"></a></td><td><font face="arial,helvetica,sanserif"><h1>Apache Tomcat 6.0</h1></font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img src="../../images/asf-logo.gif" align="right" alt="Apache Logo" border="0"></a></td></tr></table><table border="0" width="100%" cellspacing="4"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr noshade="noshade" size="1"></td></tr><tr><!--RIGHT SIDE MAIN BODY--><td width="80%" valign="top" align="left"><table border="0" width="100%" cellspacing="4"><tr><td align="left" valign="top"><h1>Application Developer's Guide</h1><h2>Development Processes</h2></td><td align="right" valign="top" nowrap="true"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Development Processes"><strong>Development Processes</strong></a></font></td></tr><tr><td><blockquote>
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<p>Although application development can take many forms, this manual proposes
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a fairly generic process for creating web applications using Tomcat.  The
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following sections highlight the commands and tasks that you, as the developer
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of the code, will perform.  The same basic approach works when you have
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multiple programmers involved, as long as you have an appropriate source code
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control system and internal team rules about who is working on what parts
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of the application at any given time.</p>
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<p>The task descriptions below assume that you will be using CVS for source
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code control, and that you have already configured access to the appropriate
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CVS repository.  Instructions for doing this are beyond the scope of this
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manual.  If you are using a different source code control environment, you
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will need to figure out the corresponding commands for your system.</p>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="One-Time Setup of Ant and Tomcat for Development"><strong>One-Time Setup of Ant and Tomcat for Development</strong></a></font></td></tr><tr><td><blockquote>
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<p>In order to take advantage of the special Ant tasks that interact with the
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<em>Manager</em> web application, you need to perform the following tasks
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once (no matter how many web applications you plan to develop).</p>
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<ul>
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<li><em>Configure the Ant custom tasks</em>.  The implementation code for the
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    Ant custom tasks is in a JAR file named
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    <code>$CATALINA_HOME/server/lib/catalina-ant.jar</code>, which must be
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    copied in to the <code>lib</code> directory of your Ant installation.
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    <br><br></li>
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<li><em>Define one or more Tomcat users</em>.  The <em>Manager</em> web
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    application runs under a security constraint that requires a user to be
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    logged in, and have the security role <code>manager</code> assigned to
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    him or her.  How such users are defined depends on which Realm you have
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    configured in Tomcat's <code>conf/server.xml</code> file -- see the
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    <a href="../../realm-howto.html">Realm Configuration HOW-TO</a> for more
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    information.  You may define any number of users (with any username
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    and password that you like) with the <code>manager</code> role.
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    <br><br></li>
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</ul>
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</blockquote></td></tr></table>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Create Project Source Code Directory"><strong>Create Project Source Code Directory</strong></a></font></td></tr><tr><td><blockquote>
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<p>The first step is to create a new project source directory, and customize
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the <code>build.xml</code> and <code>build.properties</code> files you will
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be using.  The directory structure is described in <a href="source.html">the
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previous section</a>, or you can use the
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<a href="../sample/">sample application</a> as a starting point.</p>
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<p>Create your project source directory, and define it within your CVS
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repository.  This might be done by a series of commands like this, where
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<code>{project}</code> is the name under which your project should be
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stored in the CVS repository, and {username} is your login username:</p>
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<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
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cd {my home directory}
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mkdir myapp	<-- Assumed "project source directory"
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cd myapp
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mkdir docs
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mkdir src
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mkdir web
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mkdir web/WEB-INF
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cvs import -m "Initial Project Creation" {project} \
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	{username} start
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</pre></td><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
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<p>Now, to verify that it was created correctly in CVS, we will perform a
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checkout of the new project:</p>
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<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
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cd ..
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mv myapp myapp.bu
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cvs checkout {project}
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</pre></td><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
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<p>Next, you will need to create and check in an initial version of the
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<code>build.xml</code> script to be used for development.  For getting
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started quickly and easily, base your <code>build.xml</code> on the
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<a href="build.xml.txt">basic build.xml file</a>, included with this manual,
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or code it from scratch.</p>
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<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
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cd {my home directory}
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cd myapp
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emacs build.xml		<-- if you want a real editor :-)
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cvs add build.xml
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cvs commit
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</pre></td><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
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<p>Until you perform the CVS commit, your changes are local to your own
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development directory.  Committing makes those changes visible to other
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developers on your team that are sharing the same CVS repository.</p>
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<p>The next step is to customize the Ant <em>properties</em> that are
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named in the <code>build.xml</code> script.  This is done by creating a
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file named <code>build.properties</code> in your project's top-level
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directory.  The supported properties are listed in the comments inside
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the sample <code>build.xml</code> script.  At a minimum, you will generally
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need to define the <code>catalina.home</code> property defining where
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Tomcat 5 is installed, and the manager application username and password.
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You might end up with something like this:</p>
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<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
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# Context path to install this application on
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app.path=/hello
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# Tomcat 5 installation directory
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catalina.home=/usr/local/apache-tomcat-6.0
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# Manager webapp username and password
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manager.username=myusername
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manager.password=mypassword
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</pre></td><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
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<p>In general, you will <strong>not</strong> want to check the
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<code>build.properties</code> file in to the CVS repository, because it
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is unique to each developer's environment.</p>
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<p>Now, create the initial version of the web application deployment
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descriptor.  You can base <code>web.xml</code> on the
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<a href="web.xml.txt">basic web.xml file</a>, or code it from scratch.</p>
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<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
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cd {my home directory}
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cd myapp/web/WEB-INF
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emacs web.xml
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cvs add web.xml
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cvs commit
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</pre></td><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
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Note that this is only an example web.xml file.  The full definition
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of the deployment descriptor file is in the
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<a href="http://java.sun.com/products/servlet">Servlet Specification.</a>
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</blockquote></td></tr></table>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Edit Source Code and Pages"><strong>Edit Source Code and Pages</strong></a></font></td></tr><tr><td><blockquote>
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<p>The edit/build/test tasks will generally be your most common activities
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during development and maintenance.  The following general principles apply.
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As described in <a href="source.html">Source Organization</a>, newly created
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source files should be located in the appropriate subdirectory, under your
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project source directory.</p>
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<p>Whenever you wish to refresh your development directory to reflect the
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work performed by other developers, you will ask CVS to do it for you:</p>
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<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
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cd {my home directory}
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cd myapp
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cvs update -dP
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</pre></td><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
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<p>To create a new file, go to the appropriate directory, create the file,
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and register it with CVS.  When you are satisfied with it's contents (after
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building and testing is successful), commit the new file to the repository.
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For example, to create a new JSP page:</p>
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<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
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cd {my home directory}
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cd myapp/web		<-- Ultimate destination is document root
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emacs mypage.jsp
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cvs add mypage.jsp
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... build and test the application ...
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cvs commit
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</pre></td><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
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<p>Java source code that is defined in packages must be organized in a
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directory hierarchy (under the <strong>src/</strong> subdirectory) that
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matches the package names.  For example, a Java class named
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<code>com.mycompany.mypackage.MyClass.java</code> should be stored in file
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<code>src/com/mycompany/mypackage/MyClass.java</code>.
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Whenever you create a new subdirectory, don't forget to
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register it with CVS.</p>
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<p>To edit an existing source file, you will generally just start editing
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and testing, then commit the changed file when everything works.  Although
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CVS can be configured to required you to "check out" or "lock" a file you
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are going to be modifying, this is generally not used.</p>
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</blockquote></td></tr></table>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Build the Web Application"><strong>Build the Web Application</strong></a></font></td></tr><tr><td><blockquote>
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<p>When you are ready to compile the application, issue the following
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commands (generally, you will want a shell window open that is set to
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the project source directory, so that only the last command is needed):</p>
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<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
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cd {my home directory}
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cd myapp		<-- Normally leave a window open here
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ant
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</pre></td><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
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<p>The Ant tool will be execute the default "compile" target in your
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<code>build.xml</code> file, which will compile any new or updated Java
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code.  If this is the first time you compile after a "build clean",
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it will cause everything to be recompiled.</p>
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<p>To force the recompilation of your entire application, do this instead:</p>
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<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
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cd {my home directory}
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cd myapp
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ant all
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</pre></td><td bgcolor="#023264" width="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
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<p>This is a very good habit immediately before checking in changes, to
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make sure that you have not introduced any subtle problems that Javac's
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conditional checking did not catch.</p>
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</blockquote></td></tr></table>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Test Your Web Application"><strong>Test Your Web Application</strong></a></font></td></tr><tr><td><blockquote>
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<p>To test your application, you will want to install it under Tomcat.  The
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quickest way to do that is to use the custom Ant tasks that are included in
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the sample <code>build.xml</code> script.  Using these commands might follow
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a pattern like this:</p>
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<ul>
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<li><em>Start Tomcat 5 if needed</em>.  If Tomcat 5 is not already running,
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    you will need to start it in the usual way.
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    <br><br></li>
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<li><em>Compile your application</em>.  Use the <code>ant compile</code>
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    command (or just <code>ant</code>, since this is the default).  Make
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    sure that there are no compilation errors.
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    <br><br></li>
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<li><em>Install the application</em>.  Use the <code>ant install</code>
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    command.  This tells Tomcat to immediately start running your app on
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    the context path defined in the <code>app.path</code> build property.
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    Tomcat does <strong>NOT</strong> have to be restarted for this to
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    take effect.<br><br></li>
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<li><em>Test the application</em>.  Using your browser or other testing
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    tools, test the functionality of your application.
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    <br><br></li>
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<li><em>Modify and rebuild as needed</em>.  As you discover that changes
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    are required, make those changes in the original <strong>source</strong>
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    files, not in the output build directory, and re-issue the
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    <code>ant compile</code> command.  This ensures that your changes will
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    be available to be saved (via <code>cvs commit</code>) later on --
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    the output build directory is deleted and recreated as necessary.
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    <br><br></li>
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<li><em>Reload the application</em>.  Tomcat will recognize changes in
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    JSP pages automatically, but it will continue to use the old versions
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    of any servlet or JavaBean classes until the application is reloaded.
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    You can trigger this by executing the <code>ant reload</code> command.
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    <br><br></li>
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<li><em>Remove the application when you re done</em>.  When you are through
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    working on this application, you can remove it from live execution by
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    running the <code>ant remove</code> command.</li>
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</ul>
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<p>Do not forget to commit your changes to the source code repository when
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you have completed your testing!</p>
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</blockquote></td></tr></table>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Creating a Release"><strong>Creating a Release</strong></a></font></td></tr><tr><td><blockquote>
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<p>When you are through adding new functionality, and you've tested everything
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(you DO test, don't you :-), it is time to create the distributable version
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of your web application that can be deployed on the production server.  The
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following general steps are required:</p>
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<ul>
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<li>Issue the command <code>ant all</code> from the project source
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    directory, to rebuild everything from scratch one last time.
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    <br><br></li>
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<li>Use the <code>cvs tag</code> command to create an identifier for
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    all of the source files utilized to create this release.  This allows
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    you to reliably reconstruct a release (from sources) at a later
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    time.</li>
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<li>Issue the command <code>ant dist</code> to create a distributable
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    web application archive (WAR) file, as well as a JAR file containing
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    the corresponding source code.
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    <br><br></li>
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<li>Package the contents of the <code>dist</code> directory using the
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    <strong>tar</strong> or <strong>zip</strong> utility, according to
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    the standard release procedures used by your organization.</li>
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</ul>
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</blockquote></td></tr></table>
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        Copyright © 1999-2006, Apache Software Foundation
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