how to design a login page in jsp? -

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my index.jsp consists of user name , password:

<html>     <head>         <title>employee page </title>     </head>     <body>         <br>         <p>             <h3>                 <center>please enter user name , password</center>             </h3>         </p>         <br>         <br>         <form action="login.jsp " method = "post" >             <center>username</center>             <center>                 <input type="text" name="username">             </center>             <center>password</center>             <center>                 <input type="pass" name="pass">             </center>             <center>                 <input type="submit" name="submit" value="login" onclick="login.jsp" >             </center>         </form>     </body> </html>

and following login.jsp:

<html>     <body bgcolor = "yellow">         <%@ page import ="java.sql.*" session = "false" %>          <%!         preparedstatement pst;         connection con;         public void jspinit()         {             try             {                 driver mydriver = new oracle.jdbc.driver.oracledriver();                 drivermanager.registerdriver(mydriver);                 connection con = drivermanager.getconnection("ashishga02","ea_dev","ea_dev");                 pst = con.preparestatement("select username emp456 username = ?  , pass = ? ");             }             catch(exception e)             {             }         }          public void jspdestroy()         {             try             {                 con.close();             }             catch(exception e)             {             }         }         %>          <%         string n = request.getparameter("username");         string p = request.getparameter("password");         pst.setstring(1,n);         pst.setstring(2,p);         resultset rs = pst.executequery();         if(rs.next())         {             out.println("welcome");         }         else         {             out.println("<font color = red> invalid ....</font>");         %>              <%@ include file = "index.jsp"%>          <%         }         %>     </body> </html>

error stack-trace:

org.apache.jasper.jasperexception: exception occurred processing jsp page login.jsp @ line 40  37: <% 38: string n = request.getparameter("username"); 39: string p = request.getparameter("password"); 40: pst.setstring(1,n); 41: pst.setstring(2,p); 42: resultset rs = pst.executequery(); 43: if(rs.next()) stacktrace: org.apache.jasper.servlet.jspservletwrapper.handlejspexception(jspservletwrapper.ja org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:419) org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:313) org.apache.jasper.servlet.jspservlet.service(jspservlet.java:260) javax.servlet.http.httpservlet.service(httpservlet.java:717)

plese me this.
if wants alter whole code or query, free please @ least expalin code comments.

i knew in java not know anything. getting error on lines.


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