java.lang.NumberFormatException: null i

Here i come up with problem while performing some operation like update,delete and insert but its return some null value with exception kindly some one could look at the code if its wrong:

Error:

HTTP Status 500 - null

type Exception report

message null

description The server encountered an internal error that prevented it from fulfilling this request.

exception

java.lang.NumberFormatException: null
    java.lang.Integer.parseInt(Integer.java:454)
    java.lang.Integer.parseInt(Integer.java:527)
    Controller.ControllerTest.doGet(ControllerTest.java:48)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.37 logs.

Apache Tomcat/6.0.37

user.jsp:

<form method="POST" action='ControllerTest' name="frmAddUser">

  <jsp:useBean id="users" class="java.util.ArrayList" scope="request" />
        <% for(int i = 0; i < users.size(); i+=1) 
        { 
            UseBean user = (UseBean)users.get(i);
        %>

        id:<input type="text" name="ID" value="<%=user.getID() %>"><br/>
        Name:<input type="text" name="Name" value="<%= user.getName() %>"><br/>
        Password:<input type="text" name="password" value="<%= user.getPassword() %>"><br/>
        phoneno:<input type="text" name="Phoneo" value="<%= user.getPhoneo() %>"><br/>
        Emailid:<input type="text" name="Emailid" value="<%= user.getEmailID() %>">  <br/> 

        <%} %>
         <input type="submit" value="Submit" />
    </form>

listuser.jsp

  <body>
<table border=1>
<thead>
    <tr>
    <th>Id</th>
    <th>Name</th>
    <th>password</th>
    <th>phoneno</th>
    <th>emailid</th>
    <th colspan=2>Action</th>
    </tr>
</thead>
<tbody>
    <jsp:useBean id="users" class="java.util.ArrayList" scope="request" />
    <% for(int i = 0; i < users.size(); i+=1) 
    { 
        UseBean user = (UseBean)users.get(i);
    %>
        <tr>
        <td><%= user.getID() %></td>
        <td><%= user.getName() %></td>
        <td><%= user.getPassword() %></td>
        <td><%= user.getEmailID() %></td>
        <td><%= user.getPhoneo() %></td>
        <td><a href="ControllerTest?action=edit&userId=<%= user.getID() %>" >Update</a></td>
        <td><a href="ControllerTest?action=delete&userId=<%= user.getID() %>">Delete</a></td>
        </tr>
    <% } %>
</tbody>
</table>
<p>
<a href="ControllerTest?action=insert">Add User</a>
</p>

Controllertest.java:

package Controller;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import dao.UserDao;
import dbBean.UseBean;

public class ControllerTest extends HttpServlet
{
    private static final long serialVersionUID = 1L;
    private static String INSERT_OR_EDIT = "/user.jsp";
    private static String LIST_USER = "/listUser.jsp";

    private UserDao dao;

    public ControllerTest()
    {
        super();
        dao = new UserDao();

    }

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException
    {

        String forward = "";
        String action = request.getParameter("action");
        if (action.equalsIgnoreCase("delete"))
        {
            try
            {
                int userId = Integer.parseInt(request.getParameter("userId"));
                dao.deleteUser(userId);
                forward = LIST_USER;
                request.setAttribute("users", dao.getAllUsers());
            }
            catch (NumberFormatException ex)
            {

                System.out.println("Error occured with during conversion delete");
            }
        } 
        else if (action.equalsIgnoreCase("edit"))
        {
            forward = INSERT_OR_EDIT;
            try
            {

                int userId = Integer.parseInt(request.getParameter("userId"));
                UseBean bean = dao.getUserById(userId);
                request.setAttribute("user", bean);

            } catch (NumberFormatException ex)
            {

                System.out.println("Error occured with during conversion edit");
            }
        }
        else if (action.equalsIgnoreCase("listUser"))
        {
            forward = LIST_USER;
            request.setAttribute("users", dao.getAllUsers());
        } else
        {
            forward = INSERT_OR_EDIT;
        }
        RequestDispatcher view = request.getRequestDispatcher(forward);
        view.forward(request, response);

    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException
    {

        try
        {
            UseBean bean = new UseBean();
            bean.setName(request.getParameter("Name"));
            bean.setPassword(request.getParameter("password"));
            bean.setPhoneo(request.getParameter("Phoneo"));
            bean.setEmailID(request.getParameter("Emailid"));
            String userid = request.getParameter("ID");
            if (userid == null || userid.isEmpty())
            {
                dao.addUser(bean);
            } else
            {
                bean.setID(Integer.parseInt(userid));
                dao.updateUser(bean);
            }
            RequestDispatcher view = request.getRequestDispatcher(LIST_USER);
            request.setAttribute("users", dao.getAllUsers());
            view.forward(request, response);

        }

        catch (Exception e)
        {
            e.printStackTrace();
            System.out.println("erro occuring in update code");
        }

    }
}

标签： java jsp servlets numberformatexception

3条回答

\"骚年 ilove

2楼-- · 2019-06-21 08:20

You get a NumberFormatException, if you do not pass a valid number to Integer.parseInt()

int userId = Integer.parseInt(request.getParameter("userid"));

Try to print the value of request.getParameter("userid") and check.

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傲

3楼-- · 2019-06-21 08:21

You're getting a NumberFormatException when trying to convert the empty string "" into an Integer...

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时光不老，我们不散

4楼-- · 2019-06-21 08:39

The page you are forwarding on might have some string to integer conversions that might be creating the error

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java.lang.NumberFormatException: null i

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