can not execute jar file from cmd

Question

i created an executable jar file using the command jar cmf <text-file-points-to-main-class> <archive-name.jar> as a result an executable jar file is produced, but when i attempted to open that executable jar using java -jar file-name.jar the following exception is raised

Exception in thread "main" java.lang.NullPointerException at sun.launcher.LauncherHelper.getMainClassFromJar(LauncherHelper.java:399) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:463)

the <text-file-points-to-main-class> actually contains--->Main-Class:hello.java also i tried(hello without .java) i can't point what exactly is the problem ? note that the class file works properly

There's a lot of posts about this already, did none of them really help? stackoverflow.com/questions/7368349/… stackoverflow.com/questions/8192647/… stackoverflow.com/questions/9287997/… — MrLore
– MrLore, Commented Dec 16, 2012 at 19:52

Ian Roberts · Accepted Answer · 2012-12-16 20:00:05Z

Main-Class:hello.java

The Main-Class value should be the fully qualified class name, not the file name, e.g. for

package com.example; public class hello {

you need Main-Class: com.example.hello

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