How to Easily Combine Multiple JAR Files into a Single Executable JAR?

Easiest way to merge a release into one JAR file

Question:

To combine multiple JAR files into a single executable JAR, what tools or scripts are available? Specifically, a tool that can easily set the main manifest file and enable execution is desired.

Example:

Consider a Java restructured text tool that should be runnable via:

java -jar rst.jar

However, the downloaded ZIP file contains numerous dependencies despite having no apparent dependencies.

Answer:

Ant's zipfileset provides an effortless solution:

<code class="xml"><jar id="files" jarfile="all.jar">
    <zipfileset src="first.jar" includes="**/*.java **/*.class"/>
    <zipfileset src="second.jar" includes="**/*.java **/*.class"/>
</jar></code>

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