NoClassDefFoundError when attempting to execute jar file

Question

I've created a jar file for an application that uses a 3d party jar file -comm.jar
I jarred this jar into my new jar and I get the following error when I attempt to execute the jar: "Exception in thread "main" java.lang.NoClassDefFoundError: ColorScan"
where ColorScan is the class containing main() (as indicated in MF file)
I believe this is a classpath problem, however, should this problem exist if the classpath includes the location of ColorScan and the 3d party jar file (comm.jar)???
I'm running on Windows 2000
thanks

Answer 1

PROBLEM RESOLVED:
To include an existing jar file in a newly created jar file FIRST extract the contents of the existing jar file
use the command:
jar -xvf comm.jar
where comm.jar is the name of the jar file you wish to extract from. This operation may create subdirectories off of the directory where the jar file to be extracted exists (depends on jar file and what's in it)
eg.
myJarDirectory/javax/comm/*.class
myJarDirectory/com/sun/comm/*.class
create a Manifest.MF file in the directory where you want to create a new jar file (make sure the extracted .class files from the existing jar file, or the subdirectories that contain them, are located in this directory also).
the manifest file looks like this (watch case!)
Manifest-Version: 1.0
Main-Class: MyMainClass
Created-by: Joe Developer
where MyMainClass is the name of the class file that contains your main()
Make sure all of your class files (from your program and the original jar file) are located in the same directory (with the Manifest.MF file)
Run the following command to create a new jar file
jar -cvfm cs.jar Manifest.MF *.class javax com
where javax and com are the base subdirectories extracted from the original jar file
and cs.jar is the name of your new jar file.
Once this jar file is created you can just click on the icon and run the app from anywhere
that's all