help! strange error in servlet running

My servlet code is like this:
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.sql.*;
import java.text.*;
public class JDBC4Servlet extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException
{ response.setContentType("text/html");
PrintWriter out = new PrintWriter(response.getOutputStream());
out.println("<HTML>");
out.println("<HEAD><TITLE>Table</TITLE></HEAD>");
out.println("<BODY>");
try{
//System.setProperty("jdbc.drivers", "com.mysql.jdbc.Driver");
Class.forName("oracle.jdbc.driver.OracleDriver");
out.println("-1");
out.flush();
out.println("0");
out.flush();
Connection con =
DriverManager.getConnection("jdbc

racle:thin:@kgdev01:1521:testdb","sysadmin","kinetix");
// this line has problem
out.println("1");
out.flush();
Statement stmt = con.createStatement();
out.println("2");
.................
The file succeds to compile and then i put the servlet class file into
the websphere application server directory.
I open the browser and then test the servlet.
The error output is:
-1 0 java.lang.ArrayIndexOutOfBoundsException: 7
But if I set the incorrect username as the parameter of the
getconnection
The servlet can suceed to detect invalid user log in. The output is :
-1 0 java.sql.SQLException: ORA-01017: invalid username/password; logon
denied
This mean that the connection setting should be correct.
Anyone know how to solve this problem.
Thx for reply.

this version is more correct
My servlet code is like this:
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.sql.*;
import java.text.*;
public class JDBC4Servlet extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException
{ response.setContentType("text/html");
PrintWriter out = new PrintWriter(response.getOutputStream());
out.println("<HTML>");
out.println("<HEAD><TITLE>Table</TITLE></HEAD>");
out.println("<BODY>");
try{
//System.setProperty("jdbc.drivers", "com.mysql.jdbc.Driver");
Class.forName("oracle.jdbc.driver.OracleDriver");
out.println("-1");
out.flush();
out.println("0");
out.flush();
Connection con =
DriverManager.getConnection("jdbc. oracle:thin:@kgdev01:1521:testdb","sysadmin","kinetix");
// this line has problem
out.println("1");
out.flush();
Statement stmt = con.createStatement();
out.println("2");
.................
The file succeds to compile and then i put the servlet class file into
the websphere application server directory.
I open the browser and then test the servlet.
The error output is:
-1 0 java.lang.ArrayIndexOutOfBoundsException: 7
But if I set the incorrect username as the parameter of the
getconnection
The servlet can suceed to detect invalid user log in. The output is :
-1 0 java.sql.SQLException: ORA-01017: invalid username/password; logon
denied
This mean that the connection setting should be correct.
Anyone know how to solve this problem.
Thx for reply.

If you are entering the wrong password then you would surely not get the connection and hence the error.
but for the arrayindexoutofboundexception you should give the complete code. because i am unable to under stand the problem seeing only that part of the code. kindly present the complete code.
regards,
shekar.