Creating a Java archive (JAR)

Here's how to create an ant target to JAR up the contents of subdirectory bin (compiled Java class files). Similar things must happen to create a WAR file (ant target <war ... />).

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01.<?xml version="1.0" encoding="UTF-8"?>
02.<project name="helloworld.makejar" default="makejar" basedir=".">
03. 
04.    <target name="makejar" description="Create a JAR for the HelloWorld project">
05.        <delete file="helloworld.jar" />
06. 
07.        <jar jarfile="helloworld.jar" includes="**/*.class" basedir="bin">
08.            <manifest>
09.                <attribute name="Built-By"               value="${user.name}" />
10.                <attribute name="Main-Class"             value="project.builder.example.HelloWorld" />
11.                <attribute name="Specification-Title"    value="Example that works" />
12.                <attribute name="Specification-Version"  value="1.0.0" />
13.                <attribute name="Specification-Vendor"   value="Example Organization" />
14.                <attribute name="Implementation-Title"   value="common" />
15.                <attribute name="Implementation-Version" value="1.0.0 today" />
16.                <attribute name="Implementation-Vendor"  value="Acme Corp." />
17.            </manifest>
18.        </jar>
19.    </target>
20. 
21.    <javac srcdir="src" destdir="bin" includeantruntime="false" />
22.</project>