Jar文件无法正常工作？

Question

I made a classic hello world program in java called Hello.java:

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

and I compiled it: javac Hello.java
then I made a manifest called manifest.txt:

Main-Class: Hello

I then said jar cfm myJar.jar manifest.txt Hello.class and indeed it made a jar file
but when I did java -jar myJar.jar it said no main manifest attribute. Thanks in advance .

Answer 1

您必须修改META-INF / MANIFEST.MF并添加此行Main-Class：com.mypackage.YourClass

Answer 2

It should be like

jar -cvfm myJar.jar manifest.txt com.mysample.work.Hello.class

v - verbose (optional)

Check your Hello class has the correct package