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From: Knute Johnson <nospam@knutejohnson.com>
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Subject: Re: Beginner Problem - Manifest file
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Date: Mon, 30 May 2011 14:20:50 -0700
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On 05/30/2011 01:53 PM, William Colls wrote:
>
> Environment:
> Ubuntu 10.04.2 64 bit
> Java 1.6.0_24
> NetbeansIDE 6.8
>
> I have built a small application containing two classes. When I build
> the application in the IDE, it builds without error, and creates a .jar
> file.
>
> When I try to run the .jar using the command
>
> java -jar myapp.jar
>
> I get the error
>
> Failed to load Main-Class manifest attribute from myapp.jar
>
> One of the class files does contain the main declaration
>
> public static void main(String args)
>
>  From my reading, I understand that there should be a file with the name
> manifest.txt in the build directory that gets incorporated into the .jar
> file, but I don't know what the contents of the file should be. My
> original understanding of how the IDE worked led me to believe that it
> would create the manifest file automatically, but this doesn't seem to
> be happening.
>
> Any guidance would be greatly appreciated.
>
> Thanks for your time.
>

It can be any name, doesn't matter.  The line you want is;

Main-Class: mypackage.MyClass

 From the docs on jar;

# attribute defined for stand-alone applications
# This attribute is used by stand-alone applications that are bundled 
into executable jar files which can be invoked by the java runtime 
directly by running "java -jar x.jar".

     * Main-Class :
     *

       The value of this attribute defines the relative path of the main 
application class which the launcher will load at startup time. The 
value must not have the .class extension appended to the class name.

-- 

Knute Johnson
s/knute/nospam/