Test for null result set

I am trying to do a test for a null result set. Basically if the result set returns a value I want to display a table, otherwise I want to display an error message. The following code does not produce the error message. Either the test for null is incorrect, or for some reason I am not getting a null result set even when I don't enter any text into the following text boxes (this is for a login screen, these text boxes come a login screen):
<input type="text" name="username">
<input type="text" name="password">
This is the code for the action page:
<HTML>
<%@page import="java.sql.*"%>
<%
//define connection
Connection con = null;
String user1 = request.getParameter("username");
String pass1 = request.getParameter("password");
String test = "good";
try{
//get the class
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
//get the connection
con = DriverManager.getConnection("jdbc:odbc:errorlog", "admin", "");
//catch your exceptions!
catch(Exception e){
out.println(e.getMessage());
%>
<title>Error Application - Logged Errors</title>
<link href="style/errorstyle.css" rel="stylesheet" type="text/css">
<BODY>
<%
//define resultset and statement
ResultSet rs=null;
Statement stmt=null;
try {
//Using the current database connection create a statement
stmt=con.createStatement();
%>
<%
String sql="SELECT* FROM tblUsers" + " WHERE Username = '"+user1+"' AND Password ='"+pass1+"'";
rs = stmt.executeQuery(sql);
%>
<% //Fetch all the records and print in table
while(rs.next()){
String user2 = rs.getString("FirstName");
String pass2 = rs.getString("LastName");
%>
<table width="100%" border="0" cellspacing="1" cellpadding="6">
<tr >
<td width="67" height="27" bgcolor="#999999"><strong><font size="- 1">First Name</font></strong>
</td>
<td width="89" bgcolor="#999999"><strong><font size="-1">Last
Name</font></strong>
</td>
</tr>
<tr>
<td>
<%out.println(user2);%>
</td>
<td><%out.println(pass2);%></td>
</table>
<%}
if (rs == null)
out.println("Incorrect Username or Password");
//close all your open resultsets, statements, and connection when you are done with them!
rs.close();
stmt.close();
con.close();
//catch all your exceptions
catch (SQLException e) {
out.println(e.getMessage());
%>

You simply test the rs.next().
if ( rs.next() )
//spit out the rs row and
//continue processing the resultset 'til empty
else
msg = "invalid username or password
}

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Message was edited by: M Petter

Can you really use Display String formula to test for NULL

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