Creating JAR Files

The jar task JARs files for you. Example 3-4 is a fairly complex example, which creates a new JAR file with an included manifest, MANIFEST.MF, that contains several attributes.

Example 3-4. Using the jar task (ch03/jar/build.xml)

<?xml version="1.0" ?>
<project default="main">

    <property name="message" value="Building the .jar file." />
    <property name="src" location="source" />
    <property name="output" location="bin" />

    <target name="main" depends="init, compile, compress">
    <target name="init">
        <mkdir dir="${output}" />
    <target name="compile">
        <javac srcdir="${src}" destdir="${output}" />
    <target name="compress">
        <jar destfile="${output}/Project.jar" basedir="${output}" 
            includes="*.class" >
                <attribute name="Author" value="${}"/>
                <section name="Shared">
                    <attribute name="Title" value="Example"/>
                    <attribute name="Vendor" value="MegaAntCo"/>
                <section name="Copyright">
                    <attribute name="Copy" value="(C) MegaAntCo 2005"/>

The created JAR file contains Project.class and MANIFEST.MF; this latter file contains these contents:

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.6.1
Created-By: 1.4.2_03-b02 (Sun Microsystems Inc.)
Author: Steven Holzner

Name: Shared
Title: Example
Vendor: MegaAntCo

Name: Copyright
Copy: (C) MegaAntCo 2005


Want to sign your JAR file for distribution? Use the jarsign task like this:

<signjar jar="jarfile.jar" ...

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