The JAR file distributor wants you to specify the main-class on the command line.The main-class to run was not listed in the runnable JAR file’s manifest file.If you get this error when you run a JAR that should be executable, the problem could be one of these issues: If you try to execute a JAR file that is not meant to be run, you will get an error message that says: Java JAR error: Could not find or load main class. Some are just standard libraries with no execution capabilities at all. You can also open a JAR file in Windows PowerShell or an Ubuntu Terminal window with the following command if you have the JDK installed: jar xf name-of-jar-file.jar Why do I get a ‘Could not load main class’ error when I run my JAR? You can open Java JAR files with any Zip utility such as 7-Zip or WinRAR. If you look inside at its contents, you can open a JAR file and extract its contents with any standard ZIP or decompression utility. How do I extract the contents of a JAR file? A Java JAR file is really just a ZIP file with a. The Java JAR file uses a standard compression algorithm used by all of the most popular tools. The JAR file encompasses every file required to support an application, zipped up and compressed into a single, archive file. The term ‘archive’ is really key to understanding what a JAR file is. The term JAR is an acronym built from the words: Java Application a Rchive. JAR files are simply ZIP files that contain all of the resources required to run a Java application. Commands to create, extract and run JAR files Function If the JAR file to run is located in a different folder, you’ll need to provide a full path to the file. This Java JAR run command assumes the JAR in question is located in the current folder. How do you run a JAR at the command line?Īs long as you have Java installed, and the PATH variable points to the \bin directory of the JDK, you issue the following command to run a JAR file at the command line: java -jar jarfilename.jar
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