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<title>JLink Task</title>
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<h2><a name="jlink">Jlink</a></h2>
<h3><b>Description:</b></h3>
<p>Links entries from sub-builds and libraries.</p>

<p>The jlink task can be used to build jar and zip files, similar to 
the <i>jar</i> task.
However, jlink 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 
<i>mergefiles</i>
pathelement) <i>and</i> the mergefile ends in &quot;.zip&quot; or 
&quot;.jar&quot;,
entries in the mergefile will be merged into the outfile. A file with 
any other extension
will be added to the output file, even if it is specified in the 
mergefiles element.
Directories specified in either the mergefiles or addfiles 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, jlink merges or adds the first entry and ignores all subsequent entries.
</p>

<p>
jlink ignores META-INF directories in mergefiles. 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 <i>includes</i>, <i>includesfile</i>, <i>excludes</i>, 
<i>excludesfile</i>,
and <i>defaultexcludes</i> attributes on the <i>addfiles</i> and 
<i>mergefiles</i>
nested elements. 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. The patterns are
relative to the <i>base</i> directory.</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">outfile</td>
     <td valign="top">the path of the output file.</td>
     <td valign="top" align="center">Yes</td>
   </tr>
   <tr>
     <td valign="top">compress</td>
     <td valign="top">whether or not the output should be compressed. 
<i>true</i>,
                      <i>yes</i>, or <i>on</i> result in compressed output.
                      If omitted, output will be uncompressed (inflated).</td>
     <td valign="top" align="center">No</td>
   </tr>
   <tr>
     <td valign="top">mergefiles</td>
     <td valign="top">files to be merged into the output, if possible.</td>
     <td valign="middle" align="center" rowspan="2">At least one of 
mergefiles or addfiles</td>
   </tr>
   <tr>
     <td valign="top">addfiles</td>
     <td valign="top">files to be added to the output.</td>
   </tr>
</table>

<h3>Examples</h3>

The following will merge the entries in mergefoo.jar and mergebar.jar 
into out.jar.
mac.jar and pc.jar will be added as single entries to out.jar.
<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>

Suppose the file foo.jar contains two entries: bar.class and 
barnone/myClass.zip.
Suppose the path for file foo.jar is build/tempbuild/foo.jar. The 
following example
will provide the entry tempbuild/foo.jar in the out.jar.
<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>

However, the next example would result in two top-level entries in out.jar,
namely bar.class and barnone/myClass.zip
<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>

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