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<h2><a name="jar">Jar</a></h2>
<h3>Description</h3>
<p>Jars a set of files.</p>
<p>The <i>basedir</i> attribute is the reference directory from where to jar.</p>
<p>Note that file permissions will not be stored in the resulting jarfile.</p>
<p>It is possible to refine the set of files that are being jarred. This can be
done with the <i>includes</i>, <i>includesfile</i>, <i>excludes</i>, <i>excludesfile</i> and <i>defaultexcludes</i>
attributes. With the <i>includes</i> or <i>includesfile</i> attribute you specify the files you want to
have included by using patterns. The <i>exclude</i> or <i>excludesfile</i> attribute is used to specify
the files you want to have excluded. This is also done with patterns. And
finally with the <i>defaultexcludes</i> attribute, you can specify whether you
want to use default exclusions or not. See the section on <a
href="../dirtasks.html#directorybasedtasks">directory based tasks</a>, on how the
inclusion/exclusion of files works, and how to write patterns.</p>
<p>This task forms an implicit <a href="../CoreTypes/fileset.html">FileSet</a> and
supports all attributes of <code>&lt;fileset&gt;</code>
(<code>dir</code> becomes <code>basedir</code>) as well as the nested
<code>&lt;include&gt;</code>, <code>&lt;exclude&gt;</code> and
<code>&lt;patternset&gt;</code> elements.</p>
<p>You can also use nested file sets for more flexibility, and specify
multiple ones to merge together different trees of files into one JAR.
The extended fileset attributes from the zip task are also available
in the jar task.
See the <a href="zip.html">Zip</a> task for more details and examples.</p>
<p>If the manifest is omitted, a simple one will be supplied by Ant.
You should not include <samp>META-INF/MANIFEST.MF</samp> in your set of files.</p>
<p>The <code>update</code> parameter controls what happens if the
JAR file already exists. When set to <code>yes</code>, the JAR file is
updated with the files specified. When set to <code>no</code> (the
default) the JAR file is overwritten. An example use of this is
provided in the <a href="zip.html">Zip task documentation</a>.</p>
<p>The <code>whenempty</code> parameter controls what happens when no files match.
If <code>create</code> (the default), the JAR is created anyway with only a manifest.
If <code>skip</code>, the JAR is not created and a warning is issued.
If <code>fail</code>, the JAR is not created and the build is halted with an error.</p>
<p>(The Jar task is a shortcut for specifying the manifest file of a JAR file. 
The same thing can be accomplished by using the <i>fullpath</i>
attribute of a zipfileset in a Zip task. The one difference is that if the
<i>manifest</i> attribute is not specified, the Jar task will 
include an empty one for you.)</p>

<h3>Parameters</h3>
<table border="1" cellpadding="2" cellspacing="0">
  <tr>
    <td valign="top"><b>Attribute</b></td>
    <td valign="top"><b>Description</b></td>
    <td align="center" valign="top"><b>Required</b></td>
  </tr>
  <tr>
    <td valign="top">file</td>
    <td valign="top">the jar-file to create.</td>
    <td valign="top" align="center">Yes</td>
  </tr>
  <tr>
    <td valign="top">basedir</td>
    <td valign="top">the directory from which to jar the files.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">compress</td>
    <td valign="top">Not only store data but also compress them, defaults to true</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">encoding</td>
    <td valign="top">The character encoding to use for filenames
      inside the archive.  Defaults to UTF8. <strong>It is not
      recommended to change this value as the created archive will most
      likely be unreadable for Java otherwise.</strong></td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">filesonly</td>
    <td valign="top">Store only file entries, defaults to false</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">includes</td>
    <td valign="top">comma separated list of patterns of files that must be
      included. All files are included when omitted.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">includesfile</td>
    <td valign="top">the name of a file. Each line of this file is
      taken to be an include pattern</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">excludes</td>
    <td valign="top">comma separated list of patterns of files that must be
      excluded. No files (except default excludes) are excluded when omitted.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">excludesfile</td>
    <td valign="top">the name of a file. Each line of this file is
      taken to be an exclude pattern</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">defaultexcludes</td>
    <td valign="top">indicates whether default excludes should be used or not
      (&quot;yes&quot;/&quot;no&quot;). Default excludes are used when omitted.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">manifest</td>
    <td valign="top">the manifest file to use.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">update</td>
    <td valign="top">indicates whether to update or overwrite
      the destination file if it already exists.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">whenempty</td>
    <td valign="top">Behavior to use if no files match.</td>
    <td valign="top" align="center">No</td>
  </tr>
</table>
<h3>Nested elements</h3>
<h4>metainf</h4>
<p>The nested <code>metainf</code> element specifies a <a
href="../CoreTypes/fileset.html">FileSet</a>. All files included in this fileset will
end up in the <code>META-INF</code> directory of the jar file. If this
fileset includes a file named <code>MANIFEST.MF</code>, the file is
ignored and you will get a warning.</p>
<h3>Examples</h3>
<pre>  &lt;jar file=&quot;${dist}/lib/app.jar&quot; basedir=&quot;${build}/classes&quot;/&gt;</pre>
<p>jars all files in the <code>${build}/classes</code> directory into a file
called <code>app.jar</code> in the <code>${dist}/lib</code> directory.</p>
<pre>  &lt;jar file=&quot;${dist}/lib/app.jar&quot;
       basedir=&quot;${build}/classes&quot;
       excludes=&quot;**/Test.class&quot;
  /&gt;</pre>
<p>jars all files in the <code>${build}/classes</code> directory into a file
called <code>app.jar</code> in the <code>${dist}/lib</code> directory. Files
with the name <code>Test.class</code> are excluded.</p>
<pre>  &lt;jar file=&quot;${dist}/lib/app.jar&quot;
       basedir=&quot;${build}/classes&quot;
       includes=&quot;mypackage/test/**&quot;
       excludes=&quot;**/Test.class&quot;
  /&gt;</pre>
<p>jars all files in the <code>${build}/classes</code> directory into a file
called <code>app.jar</code> in the <code>${dist}/lib</code> directory. Only
files under the directory <code>mypackage/test</code> are used, and files with
the name <code>Test.class</code> are excluded.</p>
<pre>  &lt;jar file=&quot;${dist}/lib/app.jar&quot;&gt;
    &lt;fileset dir=&quot;${build}/classes&quot;
             excludes=&quot;**/Test.class&quot;
    /&gt;
    &lt;fileset dir=&quot;${src}/resources&quot;/&gt;
  &lt;/jar&gt;</pre>
<p>jars all files in the <code>${build}/classes</code> directory and also
in the <code>${src}/resources</code> directory together into a file
called <code>app.jar</code> in the <code>${dist}/lib</code> directory.
Files with the name <code>Test.class</code> are excluded.
If there are files such as <code>${build}/classes/mypackage/MyClass.class</code>
and <code>${src}/resources/mypackage/image.gif</code>, they will appear
in the same directory in the JAR (and thus be considered in the same package
by Java).</p>

<hr>
<p align="center">Copyright &copy; 2000,2001 Apache Software Foundation. All rights
Reserved.</p>

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