New to Java

i have written a simple program to use jess in java.

import jess.*;
public class Work1
{
public static void main(String args[])
{
Rete r = new Rete();
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}
}

if i am executing this i am getting an error jess package does not exist.
i have copied the jess.jar to bin and lib folder of java but still i am getting the same error

can some one help me