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<!--
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
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<title>ManifestClassPath Task</title>
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</head>
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<body>
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<h2 id="manifestclasspath">Manifestclasspath</h2>
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<p><em>Since Apache Ant 1.7</em></p>
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<h3>Description</h3>
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<p>Converts a <a href="../using.html#path">Path</a> into a property whose value is appropriate for
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a <a href="manifest.html">Manifest</a>'s <code>Class-Path</code> attribute.</p>
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<p>This task is often used to work around command line limitations on Windows when using very long
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class paths when launching an application. The long class path normally specified on the command
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line is replaced by a single (possibly empty) jar file which an in-manifest <code>Class-Path</code>
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attribute whose value lists all the jar and zip files the classpath should contain. The files
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referenced from this attribute must be found relatively to the jar file itself, usually in the same
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directory. JVM automatically uses all file entries listed in the <code>Class-Path</code> attributes
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of a jar to locate/load classes. Note though that it silently ignores entries for which it cannot
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find any corresponding file.</p>
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<p>Note that the property value created may be longer than a manifest's maximum 72 characters per
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line, but will be properly wrapped as per the Jar specification by the <code><manifest></code>
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element, where the defined property is re-referenced.</p>
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<p>For this task to work properly the relative path from the file given in the <code>jarfile</code>
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attribute to the elements of the nested <code>classpath</code> must be the same as you expect them
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to be when deploying the jar.</p>
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<h3>Parameters</h3>
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<table class="attr">
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<tr>
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<th scope="col">Attribute</th>
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<th scope="col">Description</th>
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<th scope="col">Required</th>
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</tr>
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<tr>
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<td>property</td>
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<td>the name of the property to set. This property must not already be set.</td>
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<td>Yes</td>
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</tr>
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<tr>
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<td>jarfile</td>
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<td>the filename for the Jar which will contain the manifest that will use the property this
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task will set. This file need not exist yet, but its parent directory must exist.</td>
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<td>Yes</td>
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</tr>
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<tr>
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<td>maxParentLevels</td>
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<td>The maximum number of parent directories one is allowed to traverse to navigate from the jar
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file to the path entry. Put differently, the maximum number of <q>..</q> which is allowed in
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the relative path from the jar file to a given class path entry. Specify <q>0</q> to enforce a
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path entry to be in the same directory (or one of its sub-directories) as the jar file
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itself.</td>
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<td>No; defaults to <q>2</q></td>
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</tr>
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</table>
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<h3>Parameters specified as nested elements</h3>
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<h4>classpath</h4>
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<p>A <a href="../using.html#path">path-like</a> element, which can be defined in-place, or refer to
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a path defined elsewhere using the <code><classpath refid="pathid"/></code> syntax.
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This classpath must not be empty, and is required.</p>
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<h3>Examples</h3>
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<p>Assuming a path with <var>id</var>=<q>classpath</q> was already defined, convert this path
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relatively to the <samp>build/</samp> directory that will contain <samp>acme.jar</samp>, which can
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later be created with <code><jar></code> with a nested <code><manifest></code> element
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that lists an <code><attribute name="Class-Path" value="${jar.classpath}"/></code>.</p>
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<pre>
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<manifestclasspath property="jar.classpath"
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jarfile="build/acme.jar">
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<classpath refid="classpath"/>
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</manifestclasspath></pre>
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</body>
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</html>
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