Lightweight main class presented when the module JAR is executed directly.
JarInfois set as main class within the MANIFEST.MF file, the functionality can be utilized. If a library JAR file is executed standalone normally the user gets a simple error dialog telling that the main class attribute could not be found. To give the user more information about what to do with the library file, the info sub-package can be used. On headless Java environment (only command line interface CLI) the name and path of the JAR file, a short message, and the manifest contents is displayed. In JVM's with graphical displays a dialog shows up, which displays the manifest file of the JAR as well as the list of files and directories included in the archive.
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