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<title>JLink Task</title>
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<h2 id="jlink">Jlink</h2>
<h3><em><u>Deprecated</u></em></h3>
<p><em>This task has been <u>deprecated</u>. Use a <a href="../Types/zipfileset.html">zipfileset</a>
or <a href="../Tasks/zip.html#zipgroupfileset">zipgroupfileset</a> with
the <a href="../Tasks/jar.html">Jar task</a> or <a href="../Tasks/zip.html">Zip task</a>
instead.  For a task based on the JDK's jlink tool, see
<a href="link.html">Link</a>.</em></p>

<h3>Description</h3>
<p><strong>For a task based on the JDK's jlink tool, see
<a href="link.html">Link</a>.  This task is for something else
entirely.</strong></p>

<p>Links entries from sub-builds and libraries.</p>

<p>The <code>jlink</code> task can be used to build jar and zip files, similar to
the <code>jar</code> task.  However, <code>jlink</code> provides options for controlling the way
entries from input files are added to the output file. Specifically, capabilities for merging
entries from multiple zip or jar files is available.</p>

<p>If a mergefile is specified directly (eg. at the top level of a <code>mergefiles</code>
pathelement) <em>and</em> the mergefile ends in <samp>.zip</samp> or <samp>.jar</samp>, entries in
the mergefile will be merged into the <var>outfile</var>. A file with any other extension will be
added to the output file, even if it is specified in the <code>mergefiles</code> element.
Directories specified in either the <code>mergefiles</code> or <code>addfiles</code> element are
added to the output file as you would expect: all files in subdirectories are recursively added to
the output file with appropriate prefixes in the output file (without merging).</p>

<p>In the case where duplicate entries and/or files are found among the files to be merged or
added, <code>jlink</code> merges or adds the first entry and ignores all subsequent entries.</p>

<p><code>jlink</code> ignores <samp>META-INF</samp> directories in <var>mergefiles</var>. Users
should supply their own manifest information for the output file.</p>

<p>It is possible to refine the set of files that are being jlinked.  This can be done with
the <var>includes</var>, <var>includesfile</var>, <var>excludes</var>, <var>excludesfile</var>,
and <var>defaultexcludes</var> attributes on the <code>addfiles</code> and <code>mergefiles</code>
nested elements. With the <var>includes</var> or <var>includesfile</var> attribute you specify the
files you want to have included by using patterns.  The <var>exclude</var>
or <var>excludesfile</var> attribute is used to specify the files you want to have excluded. This is
also done with patterns. And finally with the <var>defaultexcludes</var> 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. The patterns are relative to
the <em>base</em> directory.</p>

<h3>Parameters</h3>
<table class="attr">
   <tr>
     <th scope="col">Attribute</th>
     <th scope="col">Description</th>
     <th scope="col">Required</th>
   </tr>
   <tr>
     <td>outfile</td>
     <td>the path of the output file.</td>
     <td>Yes</td>
   </tr>
   <tr>
     <td>compress</td>
     <td>whether or not the output should be compressed. <q>true</q>, <q>yes</q>, or <q>on</q>
       result in compressed output.</td>
     <td>No; defaults to uncompressed (inflated) output</td>
   </tr>
   <tr>
     <td>mergefiles</td>
     <td>files to be merged into the output, if possible.</td>
     <td rowspan="2">Exactly one of the two</td>
   </tr>
   <tr>
     <td>addfiles</td>
     <td class="left">files to be added to the output.</td>
   </tr>
</table>

<h3>Examples</h3>

<p>The following will merge the entries in <samp>mergefoo.jar</samp> and <samp>mergebar.jar</samp>
into <samp>out.jar</samp>.  <samp>mac.jar</samp> and <samp>pc.jar</samp> will be added as single
entries to <samp>out.jar</samp>.</p>
<pre>
&lt;jlink compress=&quot;false&quot; outfile=&quot;out.jar&quot;&gt;
   &lt;mergefiles&gt;
     &lt;pathelement path=&quot;${build.dir}/mergefoo.jar&quot;/&gt;
     &lt;pathelement path=&quot;${build.dir}/mergebar.jar&quot;/&gt;
   &lt;/mergefiles&gt;
   &lt;addfiles&gt;
     &lt;pathelement path=&quot;${build.dir}/mac.jar&quot;/&gt;
     &lt;pathelement path=&quot;${build.dir}/pc.zip&quot;/&gt;
   &lt;/addfiles&gt;
&lt;/jlink&gt;
</pre>

<p><strong>Non-deprecated alternative to the above:</strong></p>
<pre>
&lt;jar compress=&quot;false&quot; destfile=&quot;out.jar&quot;&gt;
  &lt;zipgroupfileset dir=&quot;${build.dir}&quot;&gt;
    &lt;include name=&quot;mergefoo.jar&quot;/&gt;
    &lt;include name=&quot;mergebar.jar&quot;/&gt;
  &lt;/zipgroupfileset&gt;
  &lt;fileset dir=&quot;${build.dir}&quot;&gt;
    &lt;include name=&quot;mac.jar&quot;/&gt;
    &lt;include name=&quot;pc.jar&quot;/&gt;
  &lt;/fileset&gt;
&lt;/jar&gt;
</pre>

<p>Suppose the file <samp>foo.jar</samp> contains two entries: <samp>bar.class</samp>
and <samp>barnone/myClass.zip</samp>.  Suppose the path for file <samp>foo.jar</samp>
is <samp>build/tempbuild/foo.jar</samp>. The following example will provide the
entry <samp>tempbuild/foo.jar</samp> in the <samp>out.jar</samp>.</p>
<pre>
&lt;jlink compress=&quot;false&quot; outfile=&quot;out.jar&quot;&gt;
   &lt;mergefiles&gt;
     &lt;pathelement path=&quot;build/tempbuild&quot;/&gt;
   &lt;/mergefiles&gt;
&lt;/jlink&gt;</pre>

<p>However, the next example would result in two top-level entries in <samp>out.jar</samp>,
namely <samp>bar.class</samp> and <samp>barnone/myClass.zip</samp></p>
<pre>
&lt;jlink compress=&quot;false&quot; outfile=&quot;out.jar&quot;&gt;
   &lt;mergefiles&gt;
     &lt;pathelement path=&quot;build/tempbuild/foo.jar&quot;/&gt;
   &lt;/mergefiles&gt;
&lt;/jlink&gt;</pre>

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