java.lang.NullPointerException occured while running the servlet

Question

Hi all I am writing a simple registration form to register and for that servlet. I have included all the entries in web.xml. but i dont know why I am getting the "java.lang.NullPointerException". every thing looks fine to me but I am not able to figure out the loophole. please help me out with this.

index.jsp

<form action="InsertRecord" method="post">
    <fieldset> 
     <legend>
        <font face="Courier New" size="+1" 
                color="red">
                Student Registration
        </font>
    </legend> 
    <table>
        <tr>
            <td>Student Name &nbsp;&nbsp; :</td>
            <td><input type="text" name="name"></td>
        </tr>

        <tr>
            <td>Enrollment Number &nbsp;&nbsp; :</td>
            <td><input type="text" name="enrolmentNo"></td>
        </tr>

        <tr>
            <td>Program Name &nbsp;&nbsp; :</td>
            <td><input type="text" name="program"></td>
        </tr>

        <tr>
            <td>Gender &nbsp;&nbsp; : </td>
            <td><select Name="gender">
                <option value="male">Male</option>
                <option value="female">Female</option>      
                </select>
            </td>
        </tr>

        <tr>
            <td>Address &nbsp;&nbsp; :</td>
            <td><textarea rows="3" cols="20"></textarea> 
        </tr>
        <tr>
            <td colspan="2">
            <input type="submit" value="Registration"></td>
     </table>
</fieldset> 
</form>

web.xml

 <?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
      <display-name>student</display-name>
      <welcome-file-list>
         <welcome-file>index.jsp</welcome-file>
         </welcome-file-list>
      <servlet>
        <servlet-name>InsertRecord</servlet-name>
        <servlet-class>com.varun.InsertRecord</servlet-class>
      </servlet>
      <servlet-mapping>
        <servlet-name>InsertRecord</servlet-name>
        <url-pattern>/InsertRecord</url-pattern>
      </servlet-mapping>
    </web-app>

InsertRecord.java This is servlet

   package com.varun;
    import java.io.IOException;
    import java.io.PrintWriter;
    import javax.servlet.RequestDispatcher;
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;


    public class InsertRecord extends HttpServlet {
        private static final long serialVersionUID = 1L;

        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            response.setContentType("text/html");
            PrintWriter out=response.getWriter();

            String name=request.getParameter("name");
            String en=request.getParameter("enrolmentNo");
            String program=request.getParameter("program");
            String gender=request.getParameter("gender");
            String address=request.getParameter("address");

            int id=0;
            int enrol=0;

            if(name.equals("")||en.equals("")||program.equals("")
                    ||gender.equals("")||address.equals(""))
            {
                out.println("Please insert the valid data");
                RequestDispatcher rd=request.getRequestDispatcher("/index.jsp");
                rd.include(request, response);
            }
            else
            {
                out.println("good job");
                RequestDispatcher rd=request.getRequestDispatcher("/sucess.jsp");
                rd.include(request, response);
            }


        }

    }

When troubleshooting Exceptions please include the full stack trace in your question — Dragondraikk
– Dragondraikk, Commented Apr 13, 2015 at 11:01

Jens · Accepted Answer · 2015-04-13 11:03:23Z

3

the String address is null.

String address=request.getParameter("address");

because your textarea has no name:

<td><textarea rows="3" cols="20"></textarea>

change it to

<td><textarea rows="3" cols="20" name ="address"></textarea>

and the exception should gone away.

answered Apr 13, 2015 at 11:03

Jens

69.6k15 gold badges107 silver badges133 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

singhakash · Accepted Answer · 2015-04-13 11:19:24Z

2

You dont have any parameter with name address and you are fetching in request request.getParameter("address"); giving you a null value.

Add name attribute in textarea and it will work

<textarea rows="3" cols="20" name="address"></textarea>

edited Apr 13, 2015 at 11:19

answered Apr 13, 2015 at 11:03

singhakash

7,9196 gold badges33 silver badges65 bronze badges

4 Comments

Jens Over a year ago

That is not correct. The NullPointerExcpetion will be at address.equals("")). Not in request.getParameter("address")

singhakash Over a year ago

@Jens sorry but I dont aggree the nullpointer will be on getParameter

Don Roby Over a year ago

@singhakash The getParameter call will return a null and not throw an Exception. Only when you try to use the value will you get a NullPointerException.

Jens Over a year ago

@singhakash I f you read the documentation you can see that it wil return null if the parameter is not in the request: Returns the value of a request parameter as a String, or null if the parameter does not exist

Deepika Rajani · Accepted Answer · 2015-04-13 11:07:46Z

1

The below line of code can be the reason of exception :

    String address=request.getParameter("address");

as you have not defined any html field with the attribute name address.

        <td><textarea rows="3" cols="20"></textarea>

include name="address" attribute in above textarea. This may solve the issue!

answered Apr 13, 2015 at 11:07

Deepika Rajani

5645 silver badges15 bronze badges

Comments

Jitendra Pareek · Accepted Answer · 2015-04-13 11:06:43Z

0

Correct your .jsp code :

<textarea rows="3" cols="20" name ="address"></textarea>

answered Apr 13, 2015 at 11:06

Jitendra Pareek

6377 silver badges28 bronze badges

Collectives™ on Stack Overflow

java.lang.NullPointerException occured while running the servlet

4 Answers 4

Comments

4 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

4 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related