about upload an image file to mssql database,help me !

I'm using jspsmartupload to upload an image file to mssql database,but when run it appear this error message:
An error occurs : java.lang.NullPointerException 0 file(s) uploaded in the database.
the code :
<%@ page language="java" import="java.sql.*,com.jspsmart.upload.*"%>
<jsp:useBean id="mySmartUpload" scope="page" class="com.jspsmart.upload.SmartUpload" />
<HTML>
<BODY BGCOLOR="white">
<H1>jspSmartUpload : Sample 4</H1>
<HR>
<%
// Variables
int count=0;
String DriverString,JdbcURL;
Connection conn=null;
java.sql.Statement stmt=null;
java.sql.ResultSet rs=null;
DriverString="sun.jdbc.odbc.JdbcOdbcDriver";
JdbcURL="jdbc

dbc:test";
Class.forName(DriverString);
conn=java.sql.DriverManager.getConnection(JdbcURL,"sa","");

// SQL Request
stmt = conn.createStatement();
rs = stmt.executeQuery("SELECT * FROM TFILES WHERE ID=1");
// if the resultset is not null
if (rs.next()){
// Initialization
mySmartUpload.initialize(pageContext);
// Upload
mySmartUpload.upload();
// upload file in the DB if this file is not missing
if (!mySmartUpload.getFiles().getFile(0).isMissing()){
try {
rs.updateString("FILENAME",mySmartUpload.getFiles().getFile(0).getFileName());
// Add the current file in the DB field
mySmartUpload.getFiles().getFile(0).fileToField(rs,"filel");
// Update
rs.updateRow();
count++;
} catch(Exception e) {
out.println("An error occurs : " + e.toString());
}
}
}
// Display the number of files uploaded
out.println(count + " file(s) uploaded in the database.");
rs.close();
stmt.close();
conn.close();
%>
</BODY>
</HTML>
how can I do ?thanks a lot!