Double-clicking a JAR file does not open a command prompt

I want to run a jar file by double-clicking it.

Below is the only Java class file present in it.

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
public class Sysout{
public static void main(String[] args) throws IOException{
    System.out.println("Hello World!");
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String msg = br.readLine();
    System.out.println(msg);
    br.read();
}
}

And the manifest file has a main class.

Using this link, I successfully executed the Jar file by double-clicking the batch file. This opens the command line and starts the main class.

However, if I double-click the Jar file directly, nothing will happen. I also checked this link and linked my .jar to javaw.exe. This link also offers the same. Also tried to associate .jar with java.exe

It happens that the command line opens for a split second and disappears.

, , , - .

?