No such file or directory for manifest file and no main manifest attribute when creating jar file

Question

I'm trying to create a simple jar program name Example.java which displaying "Hello World" to the user and the code are as follow:

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

and I have my manifest file as below:

Manifest-Version:1.0
Main-Class:C:\training\Java\JAR\s3\Example

when I run this command:

java -jar HelloWorld.jar

it returns

no main manifest attribute, in HelloWorld.jar

what is the problem here and why I cannot run the JAR file? I already look for some example but those were different from mine. Anyone care to help? Thanks!

try to run : java -cp HelloWorld.jar Main – hoangnh Mar 13 '20 at 03:20 — hoangnh, Mar 13 '20 at 03:20

score 0 · Answer 1 · edited Jun 20 '20 at 09:12

0

Main-Class:C:\training\Java\JAR\s3\Example

The Main-Class header should be a fully-qualified class name:

Main-Class: somePackage.Example

or just the class name if it is in the default package (bad practice):

Main-Class: Example

See:

The Java™ Tutorials - Setting an Application's Entry Point

If you have an application bundled in a JAR file, you need some way to indicate which class within the JAR file is your application's entry point. You provide this information with the Main-Class header in the manifest, which has the general form:
Main-Class: classname
The value classname is the name of the class that is your application's entry point

edited Jun 20 '20 at 09:12

Community

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answered Mar 13 '20 at 03:20

Eng.Fouad

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I already tried by putting the name class itself but it's not working also. – Darlisa Cardiff Mar 13 '20 at 03:31
@DarlisaCardiff What is the structure of the JAR file? – Eng.Fouad Mar 13 '20 at 03:33
`jar -cvf HelloWorld.jar -m Example.mf C:\training\Java\JAR\s3\Example.class` this is my command – Darlisa Cardiff Mar 13 '20 at 03:34

No such file or directory for manifest file and no main manifest attribute when creating jar file

1 Answers1