Friday, December 21, 2012

Working with Manifest Files: The Basics

Working with Manifest Files: The Basics

JAR files support a wide range of functionality, including electronic signing, version control, package sealing, and others. What gives a JAR file this versatility? The answer is the JAR file's manifest.
The manifest is a special file that can contain information about the files packaged in a JAR file. By tailoring this "meta" information that the manifest contains, you enable the JAR file to serve a variety of purposes.
This lesson will explain the contents of the manifest file and show you how to work with it, with examples for the basic features:

Understanding the Default Manifest

When you create a JAR file, a default manifest is created automatically. This section describes the default manifest.

Modifying a Manifest File

This section shows you the basic method of modifying a manifest file. The later sections demonstrate specific modifications you may want to make.

Setting Package Version Information

This section describes how to use the package version headers in the manifest file.