JSPMaker - Erro. Alguém pode ajudar?

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /computadoreslist.jsp at line 152

149:

150: // Open Connection to the database

151: try{

152: Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);

153: ResultSet rs = null;

154:

155: // Build SQL

org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:555)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

root cause

java.lang.NullPointerException

org.apache.jsp.computadoreslist_jsp._jspService(computadoreslist_jsp.java:533)

org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)

javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:390)

org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)

org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)

javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.2 logs.

Tô utilizando o Apache TomCat e MySQL.
Sou novato, alguma idéia de como resolvo isso? :?: