Problem in Connection with MySql

Question

Hi,
i don't know what is th problem with this. i have mysql-jconnector 2.0.14 JDBC Driver and Tomcat-4.0.7. This Program prints nullpointer exception.
can any one help.
<%@page import="java.sql.*"%>
<%
Connection conn = null;
try
Class.forName("com.mysql.jdbc.Driver").newInstance();
catch(Exception ex)
ex.printStackTrace();
try
conn= DriverManager.getConnection("jdbc:mysql:///sample");
catch(Exception ex)
ex.printStackTrace();
if (conn==null)
out.write ("Could not create connection");
else
out.write ("connection created");
Statement stmt = conn.createStatement();
ResultSet rst = stmt.executeQuery("Select * from Admission");
ResultSetMetaData rstmd = rst.getMetaData();
int rowcount = 0;
while (rst.next())
rowcount++;
for (int colcount=0;colcount<rstmd.getColumnCount();colcount++)
out.write (rst.getString(0));
out.write ("<br>");
rst.close();
conn.close();
%>
Thanks
Saran

Answer 1

Most likely culprit is the rs.next statement. If no records are returned rs will be null and rs.next will through a null pointer exception. try:
if (rs != null) {
   while (rs.next()) {<p>
If that doesn't work try blocking off sections of code in seperate try-catch blocks to narrow down where the exception is occuring.