I think another ClassPath problem

Question

I have a java application (class) called MainClass in package MP1. I want to use an external class in
it. the class is called kl1.java and here it is.
package pak1;
public class kl1 {
public int k;
I tried to import that class using JBuilder, Netbeans with no success. I don't want to put that class in my MP1 package (because it is not actually one but many classes, and they are all defined to be part of the pak1.something.something packages). If i put them in my MP1 package i will have to change every class to be part of the MP1.pak1.something.something package which obviously i can't do.
So the classes i want to use are located at C:\pak1 and my project is located at C:\myProject. How to use those classes. I added the classes with JBuilder somehow and it recognized them i.e. when i started writing import pak.k... it poped up the autofinish dialog with kl1 class showing. so it found the class. but when i compiled it it said couldn't find class.
the line kl1 k = new kl1(); was an error, it couldn't find kl1.
Please help. Thanks!

Answer 1

in the older versions of NetBeans you had to tell your project which folders to include; you used to be able to do it with a right click on resources and browse, but i've not looked how to do the same thing in the new version yet.