NoClassDefFoundError

I am trying to run the program below...I can compile it as long as i specify the classpath to the jar file that contains the class that references the import statement below.

But after it complies and i try to run it, I get the NoClassDefFoundError. And I can't figure out what I am doing wrong:

I compile using javac -classpath "/to/my/jars/reg.jar" doRenameIt.java

then try to run it using: java doRenameIt...and that's when I get my error

import gov.doc.getFile.util.DirectIO;

public class doRenameIt

{

public static void main (String [] args) throws Exception

{

DirectIO dio = new DirectIO("testfile.txt", "/mount/dir", "id", "/");

dio.makeVisible();

System.out.println("Now you see the file.");

}

}

[793 byte] By [The_Real_E.T.a] at [2007-11-27 1:14:20]