No exceptions but getting problem while storing data(Servlet and JDBC)

hi...one and all

Here is my problem that i have created one web app that has JDBC connectivity.I have a problem while storing data even servlet works fine with proper validation of text fields.
I have n't seen any kind of exceptions and errors in Tomcat running console while requesting the web application...

Register.html

<html>
<head><title>Rigister</title>
<h1 align=center> Registration is here</h1></head>
<body>
<form mothod=GET action="Register1">
<table align=center>
<tr>
<td>Firstname:<input type=textbox name=t1></td>
</tr>
<tr>
<td>LastName:<input type=textbox name=t2></td></tr>
<tr>
<td>Username:<input type=textbox name=t3></td></tr>
<tr>
<td>Password:<input type=textbox name=t4></td></tr>
<tr>
<td>Retypepassword:<input type=textbox name=t5><br>
<input type=submit value=Register></td></tr>
</table></form></body></html>

Register.java

import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Register extends HttpServlet
{
public void doGet(HttpServletRequest req,HttpServletResponse res)throws ServletException, IOException
{
res.setContentType("text/html");
PrintWriter out=res.getWriter();
String s1=req.getParameter("t1");
String s2=req.getParameter("t2");
String s3=req.getParameter("t3");
String s4=req.getParameter("t4");
String s5=req.getParameter("t5");
try{
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE", "system", "system");
System.out.println("Connected to db");//debug printout
String sql="insert into UserRegister values(?,?,?,?,?)";
PreparedStatement pst=con.prepareStatement(sql);
pst.setString(1,s1);
pst.setString(2,s2);
pst.setString(3,s3);
pst.setString(4,s4);
pst.setString(5,s5);
pst.executeUpdate();
}
catch(Exception e){}
if(s1==""||s2==""||s3==""||s4==""||s5==""||s4!=s5)
{
out.println("<h1 align=center>Fill all attributes correctly</h1><a href=Register.html>TryAgain</a>");
}
else{
out.println("<h1 align=center>Register Successfully</h1><br><a href=login.html>Go to login </a>");
}
}
}

Web.xml

...
As i have only theory knowledge i wonna make simple webapllication ...please kindly give me solution.And why this page could n't store the values even it can validate the values entered in fields and giving the result like what i have given HTML coding in Regiter.java

...

Thanks in Advanc...

Hello,
To start with please print stacktrace in catch block that surrounds Connection creation and query execution.
This will show you what is happening in your application.

Regards,
amit