Running a .js in a .java filter

Hi,

I have a filter that intercepts a j_security_check call from a login.jsp page. It is running on Websphere 7.0 and contacts an Active Directory database. The working information is found here. In this instance, I have a processing.js which runs on the client side to perform encryption of the j_password variable. This is run using Encrypt(String text, String key) which returns a cipher String.

My filter uses the same processing.js file to decrypt on the server side using Decrypt(String ciper, String key) which returns a text String. The .java file that is compiled into a .class successfully is as shown below:

package com.myloginfilter;

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

public class MyLoginFilter implements Filter {

    protected FilterConfig filterConfig;

    public void init(FilterConfig filterConfig) throws ServletException {
       this.filterConfig = filterConfig;
    }

    public void destroy() {
       this.filterConfig = null;
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws java.io.IOException, ServletException {
		chain.doFilter(new MyRequestWrapper((HttpServletRequest) request), response);
    }
	
	public static class MyRequestWrapper extends HttpServletRequestWrapper {
	
		public MyRequestWrapper(HttpServletRequest request) {
			super(request);
		}
		
		@Override
		public String getParameter(String name) {
			String password = getRequest().getParameter("j_password");
			String username= getRequest().getParameter("j_username");
			
			if ("j_password".equals(name)) {
				ScriptEngineManager manager = new ScriptEngineManager();
				ScriptEngine engine = manager.getEngineByName("js");
				try {
					FileReader reader = new FileReader("Processing.js");
					engine.eval(reader);
					engine.put("password", password);
					engine.put("username", username);
					engine.eval("var key = Process(username);" +
						"var decrypted = Decrypt(password, key);");
					password = (String) engine.get("decrypted");
					reader.close();
				} catch (Exception e) {
					e.printStackTrace();
				}
				return password ;
			}
			return super.getParameter(name);
		}
	}
}

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This code works in Eclipse and successfully compiles into a .class file. However, upon placing it on the Websphere and running it, it seems unable to work. I suspect I may have placed the .js file in the wrong location but it is as follows:
\WEB-INF\classes\com\myloginfilter\MyLoginFilter$MyRequestWrapper.class
\WEB-INF\classes\com\myloginfilter\MyLoginFilter.class
\WEB-INF\classes\com\myloginfilter\Processing.js

Error on the Websphere:

SRVE0068E: Uncaught exception created in one of the service methods of the servlet action in application isclite. Exception created : java.lang.IllegalStateException at com.ibm.ws.session.http.HttpSessionImpl.setAttribute(HttpSessionImpl.java:248) at com.ibm.ws.session.SessionData.putSessionValue(SessionData.java:292) at com.ibm.ws.session.SessionData.setAttribute(SessionData.java:216) at ... ... ...

and

Runtime Error: Uncaught exception created in one of the service methods of the servlet. This is an application error.

Does anyone know if I missed a step?

Thank you.