Error message-retrieve data from database

I tried to retrieve data from oracle database. I got the following error message. I did compile the files without error. but when I run index.jsp I got the following error message. is it related with taglib Directives ?
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Exception in JSP: /index.jsp:8
5: <% AccessDB accessDB=new AccessDB(); %>
6:
7: <%-- create an instance of List, then retrieve SubjectNames --%>
8: <% List subjNames=accessDB.getSubjectName(); %>
9:
10: <%-- make list accessible to page --%>
11: <% request.setAttribute("subjNames", subjNames); %>
Stacktrace:
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
root cause
java.lang.NullPointerException
     org.AccessDB.getSubjectName(AccessDB.java:68)
     org.apache.jsp.index_jsp._jspService(index_jsp.java:62)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs.
Apache Tomcat/5.5.17

Hi,
Try to print the value in List...n comment the request.setAttribute...n then run the program....
check wot value is printed in List....
This error may b because the List doesnt have anyvalue into it.....

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Error in retrieving data from database

Hi,
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What's wrong with it..Please help me..
Your help will be much appreciated.
Thank You/
Regards,
Josephine

You may want to post the error stack and a small amount of source code. As you most likely are aware, the null pointer exception is a generic java error. It means that something has tried to execute a method or value from an object that is null. It is rearly (if not never) found at compile time.

Try to retrieve data from database got error message

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And didn't you read the stack trace?
guestbk.doGet(guestbk.java:32)You could've tracked down line 32 and seen what was there at that line.
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Help them help you.
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----------------------------------------------------------------

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Message was edited by:
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Error message-retrieve data from database

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