jsp - org.apache.jasper.JasperException: java.lang.NullPointerException error -


error:

type exception report

messageinternal server error

descriptionthe server encountered internal error prevented fulfilling request.

exception

org.apache.jasper.jasperexception: java.lang.nullpointerexception root cause

java.lang.nullpointerexception note full stack traces of exception , root causes available in glassfish server open source edition 4.1 logs.

emailconfirmation.jsp 

<%@page contenttype="text/html" pageencoding="utf-8"%> <!doctype html> <html> <head>     <meta http-equiv="content-type" content="text/html; charset=utf-8">     <title>dentistree</title>     <link rel="stylesheet" type="text/css" href="emailconfirmation.css"> </head> <body> <button id="home" onmouseover="h1()" onmouseout="h2()"><b>home</b></button> <button id="register" onmouseover="r1()" onmouseout="r2()"><b>register</b></button> <button id="login" onmouseover="l1()" onmouseout="l2()"><b>login</b></button>     <button id="appointment" onmouseover="a1()" onmouseout="a2()"><b>appointment</b></button> <button id="map" onmouseover="m1()" onmouseout="m2()"><b>map</b></button> <button id="report" onmouseover="re1()" onmouseout="re2()"><b>report</b></button> <button id="doctor" onmouseover="d1()" onmouseout="d2()"><b>doctor</b></button>  <%@page import="javax.mail.passwordauthentication"%>     <%@page import="java.util.properties"%>     <%@page import="javax.mail.message"%>     <%@page import="javax.mail.messagingexception"%>     <%@page import="javax.mail.session"%>     <%@page import="javax.mail.transport"%>     <%@page import="javax.mail.internet.internetaddress"%>     <%@page import="javax.mail.internet.mimemessage"%>     <%             string name = request.getparameter("nmtxt");                 string pwd = request.getparameter("passtxt");             string date = request.getparameter("txtdate");             string address = request.getparameter("txtadd");             string blood  = request.getparameter("bloodgrp");             string sex= request.getparameter("sex");             string email=request.getparameter("emailaddtxt");          final string username="a@.com";         final string password="an";         stringbuffer sb=new stringbuffer();         for(int i=0;i<5;i++)         {              sb.append((char)(int)(math.random()*79+23+7));         }         string cap=new string(sb);     properties props=new properties();     props.put("mail.smtp.ssl.trust", "smtp.gmail.com");     props.put("mail.smtp.auth", true);     props.put("mail.smtp.starttls.enable", true);     props.put("mail.smtp.host", "smtp.gmail.com");     props.put("mail.smtp.port", "587");      string emailtxt1=request.getparameter("emailaddtxt");      session ses=session.getinstance(props,new javax.mail.authenticator()      {             protected passwordauthentication getpasswordauthentication()             {                return new passwordauthentication(username, password);              }     });     try     {             message message=new mimemessage(ses);             message.setfrom(new internetaddress("a@.com"));             message.setrecipients(message.recipienttype.to,internetaddress.parse(emailtxt1));             message.setcontent("<body>"+"hi "+name+".<br>"+"you have signed dentistree through email id:<b>"+emailtxt1+"</b><br>your password is:<b>"+pwd+"</b>thanks registering dentistree.your unique identification number is<b></br>"+cap+"</b></body>","text/html");             transport.send(message);     }     catch(messagingexception e)     {         throw new runtimeexception(e);     }     %>       <%@ page import ="java.sql.*" %>     <%             class.forname("com.mysql.jdbc.driver");             connection con = drivermanager.getconnection("jdbc:mysql://localhost:3306/dentistree","root", "tiger");             statement st = con.createstatement(); //resultset rs;             string s="insert patient(name,password, birthdate, address, gender,email,unique_key,bloodgroup) values ("+"'"+name+"','"+ pwd+ "','" + date + "','" + address + "','" + sex + "','"  + email +"','" + cap + "','" + blood+"')";             try             {                  int = st.executeupdate(s);                      }             catch(exception e)             {                 out.print(e);             }             session.setattribute("mail", email);    %>      <div id="maindiv">     <h1 id="title"><b>dentistree</b></h1>      <h3 id="congo" align="center"><b>congratulations!!!</b></h3>      <form name="mailconfo" action="confirm.jsp">      <pre id="para">            you've created dentistree account. you're account activation step away.         email has been sent email address.it consist of unique dentistree key.enter key                                             in textfield below activate account</pre>      <label id='uniquekey'><b>enter unique key:</b></label>      <input type='text' id='uniquekeytxt' name="uniquekeytxt" required>     <input type="submit" value="submit" id="sub">     <form name="mailconfo" action="confirm.jsp">  </div>  </body>

confirm.jsp

<%@page contenttype="text/html" pageencoding="utf-8"%> <!doctype html> <html> <head>     <meta http-equiv="content-type" content="text/html; charset=utf-8">     <title>dentistree</title>     <link rel="stylesheet" type="text/css" href="confirm.css">  </head> <body> <button id="home" onmouseover="h1()" onmouseout="h2()"><b>home</b></button> <button id="register" onmouseover="r1()" onmouseout="r2()"><b>register</b>   </button> <button id="login" onmouseover="l1()" onmouseout="l2()"><b>login</b></button>     <button id="appointment" onmouseover="a1()" onmouseout="a2()"><b>appointment</b></button> <button id="map" onmouseover="m1()" onmouseout="m2()"><b>map</b></button> <button id="report" onmouseover="re1()" onmouseout="re2()"><b>report</b></button> <button id="doctor" onmouseover="d1()" onmouseout="d2()"><b>doctor</b></button>   <div id="maindiv">     <h1 id="title"><b>dentistree</b></h1>     <%@ page import ="java.sql.*" %>     <form name="mailconfo">     <%         string conf=request.getparameter("uniquekeytxt");            string mail=session.getattribute("mail").tostring();          class.forname("com.mysql.jdbc.driver");         connection con = drivermanager.getconnection("jdbc:mysql://localhost:3306/dentistree",         "root", "tiger");         statement st = con.createstatement();         resultset rs = st.executequery("select unique_key patient email='"+mail+"'");         string s="update patient set verified='yes' email='"+mail+"'";         try{         if(conf.equals(rs))         {             try             {                  int = st.executeupdate(s);                      }             catch(exception e)             {                 out.print(e);             }             out.print("<h3 align='center'><b>congratulations!!!</b></h1>");             out.print("<p>your account has been verified</p>");             out.print("<p>click on login login account</p>");         }         else         {             response.sendredirect("emailconfirmation.jsp");            }}         catch(exception e)         {             out.print(e);         }     %>         </form>     </div>      </body>     </html>

error occuring in confirm.jsp. checked , both mail , uniquekeytxt have data in them.

include code in try catch block can idea.

try { string mail=session.getattribute("mail").tostring(); } catch(nullpointerexception e){}

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