Question about creating jar file

**hei1233212000** · 10-26-2010, 01:32 PM

Hi all,

I am trying to create a simple jar file, Hello.jar. However, I can't execute the Hello.jar. I got the following message, "Failed to load Main-Class manifest attribute from Hello.jar"

First of all, I create two files:

Hello.java

Java Code:

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

Hello.mf

Java Code:

Manifest-Version: 1.0
Main-Class: Hello

After that, I compile the Hello.java in cmd by typing

Java Code:

javac Hello.java

to create the Hello.class

Then, I type

Java Code:

jar cmf Hello.mf Hello.jar Hello.class Hello.java

to create the jar file, Hello.jar

And, I run it by

Java Code:

java -jar Hello.jar

However, Message come out: "Failed to load Main-Class manifest attribute from Hello.jar"
What is my problem? Can someone help me to figure it out?

Hope someone can help me.
Thank you.

**hei1233212000** · 10-27-2010, 05:45 AM

can someone help me please?

**eRaaaa** · 10-27-2010, 06:10 AM

Originally Posted by hei1233212000

Hello.mf

Java Code:

Manifest-Version: 1.0
Main-Class: Hello

"The text file from which you are creating the manifest must end with a new line or carriage return. The last line will not be parsed properly if it does not end with a new line or carriage return."

See: Modifying a Manifest File (The Java™ Tutorials > Deployment > Packaging Programs in JAR Files)