Specification of the manifest format is part of the on-line JDK documentation.
#Java jar file prevent modification how to#
This section describes how to use manifest attributes to increase the security of an applet or Java Web Start application. Enhancing Security with Manifest Attributes This section describes how to seal packages within a JAR file by modifying the manifest file. This section describes how to use the package version headers in the manifest file. This section describes how to use the Class-Path header in the manifest file to add classes in other JAR files to the classpath when running an applet or application. Adding Classes to the JAR File's Classpath This section describes how to use the Main-Class header in the manifest file to set an application's entry point. The later sections demonstrate specific modifications you may want to make. A standard-format jar file that contains one or more zip64-format nested jars can be fully executable. Attempting to do so will result in a jar file that is reported as corrupt when executed directly or with java -jar. This section shows you the basic method of modifying a manifest file. A zip64-format jar file cannot be made fully executable. This section describes the default manifest. When you create a JAR file, a default manifest is created automatically. 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 By tailoring this "meta" information that the manifest contains, you enable the JAR file to serve a variety of purposes.
The manifest is a special file that can contain information about the files packaged in a JAR file.
What gives a JAR file this versatility? The answer is the JAR file's manifest. We'll also answer some curiosities like how to easily read a jar's manifest file along the way. Specifically, we'll take a simple application and explore different ways to package and run it as a jar.
#Java jar file prevent modification archive#
JAR files support a wide range of functionality, including electronic signing, version control, package sealing, and others. In this tutorial, we're going to cover the ins and outs of working with jar or Java ARchive files in Java.
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