Merging JAR Files into a Single Executable JAR
Problem: How to seamlessly merge multiple JAR files into a single executable JAR, including customization of the main-file manifest?
Solution:
To address the need for consolidating multiple JAR files, a simple and effective solution is to utilize Apache Ant's zipfileset element. This element enables the creation of a new JAR file by combining content from existing JARs.
<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>
This Ant task will read in the contents of first.jar and second.jar and merge them into a new JAR file named all.jar. The includes attribute specifies which files to include from the source JARs.
Additional Features:
This approach also offers:
Alternative Methods:
While Ant's zipfileset is a straightforward solution, there are alternative methods:
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