Java - JAR File Indexing

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Introduction

You can generate an index file for your JAR file which is used to speed up class loading.

You must use the option i with the jar command in a separate command, after you have created a JAR file. 

jar i test.jar

This command will add a META-INF/INDEX.LIST file to the test.jar file.

You can verify it by listing the table of contents of the test.jar file by using the following command: 

jar tf test.jar

INDEX.LIST file contains location information for all packages in all JAR files.

You can include an attribute called Class-Path in the manifest file of a JAR file.

It is a space-separated list of JAR files. The attribute value is used to search and load classes when you run the JAR file.

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