Question

For ease I’ll use hello world…

public class HelloWorld{

    public static void main (String [] args){
        System.out.println("Hello World");
    }
}

Compiles and runs fine as you’d imagine. Then made a file Manifest.txt containing:

Main-Class: HelloWorld

then ran:

jar -cfm Hello.jar Manifest.txt *.class

However when I double click the resulting Hello.jar, nothing happens. I’d expect the console to pop up quickly at least…
(I in fact have a more elaborate program which waits for input)

Any ideas why this is not working?

It is starting a process in the task manager (windows) but no cmd openning

Answer 1

Try executing from command line

java -jar /path/to/YourJar.jar

Make sure you have Main-Class entry

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See Also

• Running jar file as application