Making a jar with multiple packages

> Hi all,

>

> I have a program with a few packages. I have tried

> to put them in a jar but keep getting a

> NoClassDefFoundError MyProg/ui/Maiin

>

> I have copied all the source files into MyProg

> (keeping directory structure);

>

If you are only including source files in your jar, nothing will execute.

> MyProg/ui

> MyProg/data

> MyProg/fileIO

>

> the main class is ui.Main

>

Then when you jar the Main.class file, it needs to be in the jar as ui/Main.class. It must not be just Main.class or MyProg/ui/Main.class

> I have put mainClass in MyProg (with line Main-Class:

> ui.Main and a carriage return)

>

> I made my jar with;

> jar cmf .\MyProg\mainClass MyProg.jar MyProg

> and this works fine, but when I run;

What do you get when you execute "jar tf MyProg.jar?" Do you see the right class files inside the right directory?

>

> > java -jar MyProg.jar

>

>

> The NoClassDefError occurs.

>

> Any ideas?

Please post the full error message.

Also, does the program execute outside the jar?

atmguya at 2007-7-14 22:31:34 >

I found a way to fix it (amazing how explaining something to someone else helps eh?)

I go into the MyProg directory.

The mainClass file has;

Main-Class: ui.Main

(not MyProg.ui.Main)

and execute

jar cmf mainClass MyProg.jar *

and hey presto everything works.

Would still be nice to be able to do this from above the MyProg directory though.

johnmcparlalda at 2007-7-14 22:31:34 >