packageinfojava

packageinfojava is a command-line utility designed to inspect and display information about Java archive (JAR) files. It provides a way to programmatically access metadata embedded within JARs, which are commonly used for distributing Java classes, resources, and associated data. The tool parses the JAR's contents, specifically looking for the `META-INF/MANIFEST.MF` file. This manifest file contains various attributes that describe the JAR, such as its version, main class, classpath, and custom attributes defined by the JAR's author.

packageinfojava can extract and present this manifest information in a human-readable format. Users can typically specify the path to a JAR file as an argument to the command. The output might include details like the `Manifest-Version`, `Main-Class`, `Class-Path`, and any other entries present in the manifest. This functionality is useful for developers who need to understand the composition and dependencies of a JAR without manually unpacking it. It aids in build processes, dependency analysis, and general debugging of Java applications that rely on external libraries packaged as JARs. The tool is generally part of larger Java development kits or can be obtained as a standalone utility.