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<head>
<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
<title>Link Task</title>
</head>
<body>
<h2 id="link">Link</h2>
<p><em>Since Apache Ant 1.10.6</em></p>
<h3>Description</h3>
<p>Assembles jmod files into an executable image. Equivalent to the JDK's
<a href="https://docs.oracle.com/en/java/javase/11/tools/jlink.html">jlink</a>
tool.
</p>
<p>Requires Java 9 or later.</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>destDir</td>
<td>Root directory of created image.</td>
<td>Yes</td>
</tr>
<tr>
<td>modulepath</td>
<td>Path-like sequence of jmod files to link in order to create image.</td>
<td rowspan="2">One of these is required, unless a nested
<code><modulepath></code> is present.</td>
</tr>
<tr>
<td>modulepathref</td>
<td class="left">Path-like sequence of jmod files to link in order to
create image, given as a <a href="../using.html#references">reference</a>
to a path defined elsewhere.</td>
</tr>
<tr>
<td>modules</td>
<td>Comma-separated list of modules to place in the linked image.</td>
<td>Yes, unless one or more nested <code><module></code> elements
are present.</td>
</tr>
<tr>
<td>observableModules</td>
<td>Comma-separated list of explicit modules that comprise
"universe" visible to link tool while linking.</td>
<td>No</td>
</tr>
<tr>
<td>launchers</td>
<td>Comma-separated list of commands, each of the form
<var>name</var><code>=</code><var>module</var> or
<var>name</var><code>=</code><var>module</var><code>/</code><var>mainclass</var></td>
<td>No</td>
</tr>
<tr>
<td>locales</td>
<td>Comma-separated list of extra locales, or wildcard patterns matching
multiple locale names, to include.
Requires <code>jdk.localedata</code> module.</td>
<td>No</td>
</tr>
<tr>
<td>excludeResources</td>
<td>Comma-separated list of patterns specifying resources to exclude
from source jmods. Each is either a
<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/file/FileSystem.html#getPathMatcher%28java.lang.String%29">standard PathMatcher pattern</a>
or <code>@</code><var>filename</var>, indicating a text file with
one resource name per line.</td>
<td>No</td>
</tr>
<tr>
<td>excludeFiles</td>
<td>Comma-separated list of patterns specifying files to exclude
from linked image. Each is either a
<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/file/FileSystem.html#getPathMatcher%28java.lang.String%29">standard PathMatcher pattern</a>
or <code>@</code><var>filename</var>, indicating a text file with
one file name per line.</td>
<td>No</td>
</tr>
<tr>
<td>resourceOrder</td>
<td>Comma-separated list of patterns specifying resource search order.
Each is either a
<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/file/FileSystem.html#getPathMatcher%28java.lang.String%29">standard PathMatcher pattern</a>
or <code>@</code><var>filename</var>, indicating a text file with
one resource name per line.</td>
<td>No</td>
</tr>
<tr>
<td>bindServices</td>
<td>Boolean, whether to include in linked image any service providers
found in module path corresponding to service provider interfaces
used by explicitly linked modules.</td>
<td>No, default is false</td>
</tr>
<tr>
<td>ignoreSigning</td>
<td>Boolean, whether to allow signed jar files.
(Note: As of Java 11, this is ignored and is always treated as true.)</td>
<td>No, default is false</td>
</tr>
<tr>
<td>includeHeaders</td>
<td>Boolean, whether to include header files in linked image.</td>
<td>No, default is true</td>
</tr>
<tr>
<td>includeManPages</td>
<td>Boolean, whether to include man pages in linked image.</td>
<td>No, default is true</td>
</tr>
<tr>
<td>includeNativeCommands</td>
<td>Boolean, whether to include native executables in linked image.</td>
<td>No, default is true</td>
</tr>
<tr>
<td>debug</td>
<td>Boolean, whether to include debug information.</td>
<td>No, default is true</td>
</tr>
<tr>
<td>verboseLevel</td>
<td>If set, the linker will produce verbose output, which will be logged at
the specified Ant log level (<code>DEBUG</code>, <code>VERBOSE</code>,
<code>INFO</code>, <code>WARN</code>, or <code>ERR</code>).</td>
<td>No, default is no verbose output</td>
</tr>
<tr>
<td>compress</td>
<td>Compression level of linked image. One of:
<dl>
<dt><code>0</code> or
<code>none</code></dt>
<dd>no compression (default)</dd>
<dt><code>1</code> or
<code>strings</code></dt>
<dd>constant string sharing</dd>
<dt><code>2</code> or
<code>zip</code></dt>
<dd>zip compression</dd>
</dl>
</td>
<td>No, default is no compression</td>
</tr>
<tr>
<td>endianness</td>
<td>Byte order of linked image, must be <code>little</code> or <code>big</code>
<td>No, default is native byte order</td>
</tr>
<tr>
<td>checkDuplicateLegal</td>
<td>Boolean. When merging legal notices from different modules
because they have the same name, verify that their contents
are identical.</td>
<td>No, default is false, which means any license files
with the same name are assumed to have the same content, and no
checking is done.</td>
</tr>
<tr>
<td>vmType</td>
<td>Hotspot VM in image. One of:
<ul>
<li><code>client</code>
<li><code>server</code>
<li><code>minimal</code>
<li><code>all</code>
</ul>
</td>
<td>No, default is <code>all</code></td>
</tr>
</table>
<h3>Parameters specified as nested elements</h3>
<p><code><link></code> can have the following nested elements:</p>
<ul>
<li><a href="#nested-modulepath">modulepath</a></li>
<li><a href="#nested-module">module</a></li>
<li><a href="#nested-observableModule">observableModule</a></li>
<li><a href="#nested-launcher">launcher</a></li>
<li><a href="#nested-locale">locale</a></li>
<li><a href="#nested-resourceOrder">resourceOrder</a></li>
<li><a href="#nested-excludeResources">excludeResources</a></li>
<li><a href="#nested-excludeFiles">excludeFiles</a></li>
<li><a href="#nested-compress">compress</a></li>
<li><a href="#nested-releaseInfo">releaseInfo</a></li>
</ul>
<h4 id="nested-modulepath">modulepath</h4>
<p><a href="../using.html#path">Path-like structure</a> pointing to
jmod files to link into image.</p>
<h4 id="nested-module">module</h4>
<p>Names a single module to be placed in the linked image. This may be
specified multiple times.</p>
<p>Attributes:</p>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>name</td>
<td>Name of module to add.</td>
<td>Yes</td>
</tr>
</table>
<h4 id="nested-observableModule">observableModule</h4>
<p>Names a module visible to the linking process, instead of every module
in the module path being considered. This may be specified multiple times.
<p>Attributes:</p>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>name</td>
<td>Name of module to add to list of observable modules.</td>
<td>Yes</td>
</tr>
</table>
<h4 id="nested-launcher">launcher</h4>
<p>Specifies an executable file which will be added to the linked image,
which executes a particular module's main class. Attributes:</p>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>name</td>
<td>Name of launcher. This typically is used for the name of the
executable file.</td>
<td>Yes</td>
</tr>
<tr>
<td>module</td>
<td>Name of module to execute.</td>
<td>Yes</td>
</tr>
<tr>
<td>mainClass</td>
<td>Name of entry point class in module to execute.</td>
<td>Required unless module has its own main class defined.</td>
</tr>
</table>
<h4 id="nested-locale">locale</h4>
<p>Specifies locales to include in linked image. May be specified multiple
times. Requires <code>jdk.localedata</code> module. Attributes:</p>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>name</td>
<td>Name of locale, or wildcard pattern with <q><code>*</code></q>
that matches multiple locale names.</td>
<td>Yes</td>
</tr>
</table>
<h4 id="nested-resourceOrder">resourceOrder</h4>
<p>Explicit resource search order in linked image. May be specified multiple
times. Attributes:</p>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>pattern</td>
<td>A <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/file/FileSystem.html#getPathMatcher%28java.lang.String%29">standard PathMatcher pattern</a>
for matching resources</td>
<td rowspan="2">Exactly one of these</td>
</tr>
<tr>
<td>listFile</td>
<td class="left">Text file containing list of resource names (not patterns),
one per line</td>
</tr>
</table>
<p>If the <code>resourceOrder</code> attribute is also present on the task, its
patterns are treated as if they occur before patterns in nested
<code><resourceOrder></code> elements.</p>
<h4 id="nested-excludeResources">excludeResources</h4>
<p>Excludes files from linked image tree. May be specified multiple times.
Attributes:</p>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>pattern</td>
<td>A <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/file/FileSystem.html#getPathMatcher%28java.lang.String%29">standard PathMatcher pattern</a>
for matching resources</td>
<td rowspan="2">Exactly one of these</td>
</tr>
<tr>
<td>listFile</td>
<td class="left">Text file containing list of resource names (not patterns),
one per line</td>
</tr>
</table>
<h4 id="nested-excludeFiles">excludeFiles</h4>
<p>Excludes files from linked image. May be specified multiple times.
Attributes:</p>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>pattern</td>
<td>A <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/file/FileSystem.html#getPathMatcher%28java.lang.String%29">standard PathMatcher pattern</a>
for matching files</td>
<td rowspan="2">Exactly one of these</td>
</tr>
<tr>
<td>listFile</td>
<td class="left">Text file containing list of file names (not patterns),
one per line</td>
</tr>
</table>
<h4 id="nested-compress">compress</h4>
<p>Describes how image should be compressed. Attributes:</p>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>level</td>
<td>Compression level of linked image. One of:
<dl>
<dt><code>0</code> or
<code>none</code></dt>
<dd>no compression (default)</dd>
<dt><code>1</code> or
<code>strings</code></dt>
<dd>constant string sharing</dd>
<dt><code>2</code> or
<code>zip</code></dt>
<dd>zip compression</dd>
</dl>
</td>
<td>Yes</td>
</tr>
<tr>
<td>files</td>
<td>Comma-separated list of patterns matching files to compress.
Each pattern either a
<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/file/FileSystem.html#getPathMatcher%28java.lang.String%29">standard PathMatcher pattern</a>
or <code>@</code><var>filename</var>, indicating a text file with
one file name per line.</td>
<td>No</td>
</tr>
</table>
<p><code><compress></code> can also have any number of nested
<code><files></code> elements, with these attributes:</p>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>pattern</td>
<td>A <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/file/FileSystem.html#getPathMatcher%28java.lang.String%29">standard PathMatcher pattern</a>
for matching files</td>
<td rowspan="2">Exactly one of these</td>
</tr>
<tr>
<td>listFile</td>
<td class="left">Text file containing list of file names (not patterns),
one per line</td>
</tr>
</table>
<h4 id="nested-releaseInfo">releaseInfo</h4>
<p>Replaces, augments, or trims the image's release info properties.
Can be specified multiple times. Attributes:</p>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>file</td>
<td>Java properties file containing new release info properties
that will entirely replace the current ones.</td>
<td>No</td>
</tr>
<tr>
<td>delete</td>
<td>Comma-separated property keys to remove from application's
release info
<td>No</td>
</tr>
</table>
<p><code><releaseInfo></code> can also have any number of these nested elements:</p>
<h5>add</h5>
<p>Specifies additional release info properties. Attributes:</p>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>key</td>
<td>Key of single property to add.</td>
<td rowspan="2">Yes, unless <code>file</code> is specified</td>
</tr>
<tr>
<td>value</td>
<td class="left">Value of single property to add.</td>
</tr>
<tr>
<td>file</td>
<td>Java property file containing any number of properties to add.</td>
<td>Yes, unless <code>key</code> and <code>value</code> are specified</td>
</tr>
<tr>
<td>charset</td>
<td>Character set of property file.</td>
<td>No, default is <code>ISO_8859_1</code>, in accordance with
java.util.Properties class.</td>
</tr>
</table>
<h5>delete</h5>
<p>Property keys to remove from applicaiton's release info. Attributes:</p>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>key</td>
<td>Key of property to remove.</td>
<td>Yes</td>
</tr>
</table>
<h3>Examples</h3>
<h4>Basic linking</h4>
<pre>
<jmod destfile="MyApp.jmod" classpath="build/myapp.jar"/>
<link destDir="build/image" modulepath="MyApp.jmod"
modules="com.example.myapp"/>
</pre>
<h4>Custom binaries</h4>
<p>This will cause a <samp>bin/MyEditor</samp> script to appear in the
image:
<pre>
<jmod destfile="MyApp.jmod" classpath="build/myapp.jar"/>
<link destDir="build/image" modulepath="MyApp.jmod"
modules="com.example.myapp"
launchers="MyEditor=com.example.myapp/com.example.myapp.editors.EditorMain"/>
</pre>
<p>Same thing, using a nested launcher element:</p>
<pre>
<jmod destfile="MyApp.jmod" classpath="build/myapp.jar"/>
<link destDir="build/image" modulepath="MyApp.jmod"
modules="com.example.myapp">
<launcher name="MyEditor" module="com.example.myapp"
mainClass="com.example.myapp.editors.EditorMain"/>
</link>
</pre>
<h4>Limiting locales</h4>
<p>Include just the locales needed by the application from the <a href="https://docs.oracle.com/en/java/javase/11/docs/api/jdk.localedata/module-summary.html">jdk.localedata</a> module:</p>
<pre>
<jmod destfile="MyApp.jmod" classpath="build/myapp.jar"/>
<link destDir="build/image" modulepath="MyApp.jmod"
modules="com.example.myapp,jdk.localedata"
locales="zh,jp-*"/>
</pre>
<h4>Compressed image</h4>
<p>Compress entire image:</p>
<pre>
<jmod destfile="MyApp.jmod" classpath="build/myapp.jar"/>
<link destDir="build/image" modulepath="MyApp.jmod"
modules="com.example.myapp,jdk.localedata"
compress="zip"/>
</pre>
<p>Compress only some files in the image:</p>
<pre>
<jmod destfile="MyApp.jmod" classpath="build/myapp.jar"/>
<link destDir="build/image" modulepath="MyApp.jmod"
modules="com.example.myapp,jdk.localedata">
<compress level="zip" files=".*\.xml"/>
</link>
</pre>
<h4>Cross-compiling</h4>
<p>To create an image for a different platform:
<ul>
<li>Download the JDK for that platform, and expand the archive manually into
a directory of your choice. (Downloading a zip or tar.gz version of a JDK
instead of an installer will make this easier.)</li>
<li>Determine the foreign JDK's platform string. This can be done with
a command that examines the JDK's <samp>jmods/java.base.jmod</samp> file:
<pre>
jmod describe "$FOREIGN_JDK_HOME"/jmods/java.base.jmod | grep '^platform'
</pre>
</li>
<li>Create your jmod using the foreign JDK's platform string:
<pre>
<jmod destfile="MyApp.jmod" classpath="build/myapp.jar" platform="windows-amd64"/>
</pre>
</li>
<li>Link with the foreign JDK's <samp>jmods</samp> directory in the module path:
<pre>
<link destDir="build/image"
modulepath="MyApp.jmod;${foreign-jdk-home}/jmods"
modules="com.example.myapp"/>
</pre>
</li>
</ul>
</body>
</html>
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files
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