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 fulfillingthis 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
