Once that is done the JAR file should run from the Finder or the Terminal successfully. This command updates the MANIFEST.MF file within the JAR. First of all download the JAR file from the Princeton website, then run the following command (assuming the JAR file is in your Downloads folder): jar ufe ~/Downloads/algs4.jar TestAlgs4 You can add this parameter using the Terminal. The Main-Class parameter tells the Java runtime which class is the Entry Point, i.e. This error means that the JAR file is missing the "Main-Class" parameter in its MANIFEST.MF file. However if you try to run the JAR file from the Terminal you get this error: no main manifest attribute, in. Even though the error message says to check the Console I couldn't find anything useful there.
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