Hi
I Really appreciate your quick response.

I have tried putting the jess.jar file in all the directories as you
suggest. Your second suggestion could be very valid since the application
also indicates the jess version used as v6.0 unfortunately I tried but I
couldent find a place in the net to download that version.

Just now I tried the below servlet. (minimum code using jess.)

import jess.*;
import java.io.*; 
import java.util.*;
import javax.servlet.*; 
import javax.servlet.http.*;

public class TESTServlet extends HttpServlet {   

   public void init(ServletConfig Conf) throws ServletException {
      super.init(Conf);
        try{
                Rete engine = new Rete();               
                engine.executeCommand("(reset)");
        }
        catch (JessException je) {} 

        } 
   
}

Getting a similar kind of error as below...

root cause 

java.lang.NoClassDefFoundError: jess/JessException
        java.lang.Class.getDeclaredConstructors0(Native Method)
        java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
        java.lang.Class.getConstructor0(Unknown Source)
        java.lang.Class.newInstance0(Unknown Source)
        java.lang.Class.newInstance(Unknown Source)

org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:369)
        
org.apache.catalina.servlets.InvokerServlet.doPost(InvokerServlet.java:169)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

do you think that JessException an invalid class? 
Thank you for any suggestions.
Ana
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