null pointer exception in jsp

index.html

<html>
<body>
<table align=center>
<form action="Login.jsp" method="get">
<tr>
<td colspan=2><h1>Student Login</h1></td></tr>

<tr>
<td>UserName</td>
<td><input type="text" name="un"></td>
</tr>

<tr>
<td>Password</td>
<td><input type="password" name="ps"></td>
</tr>

<tr>
<td><input type="Submit" value="Login"></td>
</tr>
</form>
<table>
</body>
</html>


Login.jsp

      <%@ page import="java.sql.*" %>
    <%!
    Connection con;
    public void Conn()
    {
    try
    {
    Class.forName("oracle.jdbc.driver.OracleDriver");
    Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl","system","oracle");
    }
    catch(Exception e)
    {
    System.out.println(e);
    }
    }


    %>

    <html>
    <body>
    <%
    try
    {
    String un,ps;
    int flag=0;
    un=request.getParameter("un");
    ps=request.getParameter("ps");
    Conn();
    Statement st=con.createStatement();
    String view="select * from Login";
    ResultSet rs=st.executeQuery(view);
    while(rs.next())
    {
    if(un.equals(rs.getString(1)) && ps.equals(rs.getString(2)))
    {
    flag=1;
    break;
    }
    }

    if(flag==1)
      {
       RequestDispatcher rd=request.getRequestDispatcher("Login1.jsp");
    rd.forward(request,response);
    }    
    else{  
    RequestDispatcher rd=request.getRequestDispatcher("index.html");
    rd.include(request,response);
    }
    }
    catch(Exception e)
    {
    out.println(e);
    }
    %>
    </body>
    </html>



when I am runnning this project getting **java.lang.NullPointerException** error , please see and resolve

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