Message-ID: <38FBE1B6.686BBA95@uswest.net>
Date: Mon, 17 Apr 2000 22:16:54 -0600
From: Nick Rathke <render@uswest.net>
MIME-Version: 1.0
To: pgsql-interfaces@postgresql.org
Subject: Postgresql JDBC errors
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I an using Postgresql-6.5.3 with jdbc6.5-1.2 and jdk1.2.2 on redhat
linux 6.2 . I
have tried to check the jdbc link using JDBCtest.java. Here is the info.

my classpath is

CLASSPATH=/lib/jdbc6.5-1.1.jar

JDBCtest.java

/*
    This file is part of the tutorial in Chapter 3 of "Getting Started
with Enhydra".
    It is not meant to be used in any other context.

    Simple program to test JDBC connectivity.  Assumes you have created
and populated
    a table called LE_TUTORIAL_DISCS in your database.
    Edit the connection string in the call to
DriverManager.getConnection()/

*/

import java.sql.*;
public class JDBCTest {
 public static void main( String[] args ) {
  Connection con  = null;
  Statement  stmt = null;
  ResultSet  rs   = null;
// Load the driver, get a connection, create statement, run query, and
print.
  try {
   Class.forName("postgresql.Driver");
   // Replace parameters below your database connection string,
username, and password
   con = DriverManager.getConnection("jdbc:postgresql:dbtest"
,"appserver", "appserver" );
   stmt = con.createStatement();
   rs = stmt.executeQuery("SELECT * FROM LE_TUTORIAL_DISCS");
   rs.next();
   System.out.println("Title = " + rs.getString("title") + " -- Artist =

" + rs.getString("artist"));
  }
  catch(ClassNotFoundException e) {
   System.err.println("Couldn't load the driver: " + e.getMessage());
  }
  catch(SQLException e) {
   System.err.println("SQLException caught: " + e.getMessage());
  }
 }
}

which gives me the errors:

Exception in thread "main" java.lang.NullPointerException:
                                    at
postgresql.jdbc2.ResultSet.getString(ResultSet.java:148)
                                    at
postgresql.jdbc2.ResultSet.getString(ResultSet.java:531)
                                    at JDBCTest.main(JDBCTest.java:25)

I don't know enough about Java or databases to make any sense of this.
Any help would be great.

Nick Rathke