I have a Java servlet as
package com.nh.bookapp;
import com.books.Book;
import java.util.*;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class BookApp
*/
#WebServlet("/BookApp")
public class BookApp extends HttpServlet {
private static final long serialVersionUID = 1L;
List <Book> Books = new ArrayList<Book>();
/*List<String> BookNames = new ArrayList<String>();
List<String> Authors = new ArrayList<String>();
List<String> Costs = new ArrayList<String>();*/
/**
* #see HttpServlet#HttpServlet()
*/
public BookApp() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
String bookName = request.getParameter("bookname");
String author = request.getParameter("authorname");
String bookCost = request.getParameter("cost");
String url = ("");
/*BookNames.add(bookName);
Authors.add(author);
Costs.add(cost);*/
Book newBook = new Book();
if(bookName.length()!=0&&author.length()!=0&&bookCost.length()!=0)
{
newBook.authorName=author;
newBook.name=bookName;
newBook.cost = Float.parseFloat(bookCost);
Books.add(newBook);
request.setAttribute("Book", newBook);
url =("/displayBook.jsp");
}
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(url);
dispatcher.forward(request, response);
}
}
The class Book is defined as :
package com.books;
public class Book {
public String name;
public String authorName;
public Float cost;
}
The index.html is as follows :
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Create a book entry</title>
</head>
<body>
<form name="BookForm" id="fBook" action="BookApp" method="post">
Name:
<input type="text" name="bookname" id="tbBook">
<br>
Author:
<input type="text" name="authorname" id="tbAuthor">
<br>
Cost:
<input type="text" name="cost" id="tbCost">
<br>
<input type ="submit" value="Create">
</form>
</body>
</html>
And displayBook.jsp is :
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Create a book entry</title>
</head>
<body>
<form name="BookForm" id="fBook" action="BookApp" method="post">
Name:
<input type="text" name="bookname" id="tbBook">
<br>
Author:
<input type="text" name="authorname" id="tbAuthor">
<br>
Cost:
<input type="text" name="cost" id="tbCost">
<br>
<input type ="submit" value="Create">
</form>
</body>
</html>
When I run the server, I encounter the error under root cause as
javax.el.PropertyNotFoundException: Property [name] not found on type [com.books.Book]
I have the necessary imports in the JSP file and the variables are declared in the class, yet I am unable to access them despite them being public.
I cannot figure out what's going wrong where. I've tried using
<c:out value="${Book.name}" />
as it was suggested in another answer but it didn't work.
Related
This question already has answers here:
Does form data still transfer if the input tag has no name?
(3 answers)
Closed 1 year ago.
request.getParameter("fname") and request.getParameter("lname") are returning a null value. I checked for typos but I can't find any. Help please.
This is the HTML code with posting to Java Servlet FirstServlet
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>One</title>
</head>
<body>
<form action="FirstServlet" method="post">
Enter FirstName: <input type="text" value="fname">
Enter LastName: <input type="text" value="lname">
<input type="submit" value="Next">
</form>
</body>
</html>
Java Servlet code here
package com;
import java.io.IOException;
import dto.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
* Servlet implementation class FirstServlet
*/
public class FirstServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* #see HttpServlet#HttpServlet()
*/
public FirstServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)
*/
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
User user = new User();
HttpSession session= request.getSession();
user.setFname(request.getParameter("fname"));
user.setLname(request.getParameter("lname"));
session.setAttribute("user", user);
response.sendRedirect("two.html");
}
}
It should be name, not value.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>One</title>
</head>
<body>
<form action="FirstServlet" method="post">
Enter FirstName: <input type="text" name="fname">
Enter LastName: <input type="text" name="lname">
<input type="submit" value="Next">
</form>
</body>
</html>
This question already has answers here:
How to transfer data from JSP to servlet when submitting HTML form
(4 answers)
Closed 2 years ago.
In my JSP Servlet application, One of the JSP page is able to send in form parameters to Servlet while other throws Null Pointer exception while doing the same thing. Why so? Will deeply appreciate help on this, please find code below.
Name.jsp file
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>What's Your Name</h1>
<form action="Name" method="POST">
First Name: <input type="text" name="firstname"></br>
Last Name: <input type="text" name="lastname"></br>
<input type="submit" value="Submit">
</form>
</body>
</html>
NameServlet file
package com.servelets;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.objects.Name;
/**
* Servlet implementation class NameServlet
*/
#WebServlet("/Name")
public class NameServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* #see HttpServlet#HttpServlet()
*/
public NameServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("Get Name");
response.getWriter().append("Served at: ").append(request.getContextPath());
request.getRequestDispatcher("WEB-INF/views/Name.jsp").forward(request, response);
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("Post Name");
Name name = new Name();
HttpSession session = request.getSession();
name.setFirstname(request.getParameter("firstname"));
name.setLastname(request.getParameter("lastname"));
session.setAttribute("name", name);
//request.getRequestDispatcher("/WEB-INF/views/Bio.jsp").forward(request, response);
response.sendRedirect("Bio");
//request.getRequestDispatcher("Bio").include(request, response);
}
}
Bio.jsp page
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>Give us your Age, Weight, Height</h1>
<h1>Welcome ${name.firstname} ${name.lastname} </h1>
<form action="Bio" method="POST">
Age: <input type="text" name="age"></br>
Weight: <input type="number" name="weight">
<select id="weightunit" name="weightunit">
<option value="kg">Kg</option>
<option value="Lb">Lb</option>
</select></br>
Height: <input type="number" name="height"> Unit: <input type="text" name="heightunit"></br>
<input type="submit" value="Submit">
</form>
</body>
</html>
BioServlet file
package com.servelets;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.objects.Bio;
/**
* Servlet implementation class BioServlet
*/
#WebServlet(description = "Servlet for Bio Page", urlPatterns = { "/Bio" })
public class BioServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* #see HttpServlet#HttpServlet()
*/
public BioServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("Get Bio");
response.getWriter().append("Served at: ").append(request.getContextPath());
request.getRequestDispatcher("WEB-INF/views/Bio.jsp").forward(request, response);
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("Post Bio");
Bio bio = new Bio();
if(request.getAttribute("age")==null) {
System.out.println("age is null");
}
HttpSession session = request.getSession();
String age = (String) request.getAttribute("age");
bio.setAge(Integer.parseInt(age));
bio.setHeight(Double.parseDouble(request.getAttribute("height").toString()));
bio.setHeightunit(request.getAttribute("heightunit").toString());
bio.setWeight(Double.parseDouble(request.getAttribute("weight").toString()));
bio.setWeightunit(request.getAttribute("weightunit").toString());
session.setAttribute("bio", bio);
response.sendRedirect("Address");
}
}
I am able to go from Name.jsp page to Bio.jsp page and access attributes in NameServlet but as soon as I enter values in Bio.jsp page and try to redirect it to next page in application, I run into a null pointer exception. stacktrace below.
May 16, 2020 5:35:53 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in [3,151] milliseconds
Get Name
Post Name
Get Bio
Post Bio
age is null
May 16, 2020 5:38:40 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [com.servelets.BioServlet] in context with path [/DisplayAddress] threw exception
java.lang.NumberFormatException: null
at java.base/java.lang.Integer.parseInt(Integer.java:614)
at java.base/java.lang.Integer.parseInt(Integer.java:770)
at com.servelets.BioServlet.doPost(BioServlet.java:50)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
The request.getAttribute("age")is coming as null from Bio.jsp page, I will deeply appreciate any help on this.
I realized I was using Request.getAttribute instead of Request.getParameter, I updated the code in my BioServlet file and it worked, updated code is shown below.
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("Post Bio");
Bio bio = new Bio();
if(request.getParameter("age")==null) {
System.out.println("age is null");
}
HttpSession session = request.getSession();
String age = (String) request.getParameter("age");
bio.setAge(Integer.parseInt(age));
bio.setHeight(Double.parseDouble(request.getParameter("height").toString()));
bio.setHeightunit(request.getParameter("heightunit").toString());
bio.setWeight(Double.parseDouble(request.getParameter("weight").toString()));
bio.setWeightunit(request.getParameter("weightunit").toString());
session.setAttribute("bio", bio);
response.sendRedirect("Address");
}
Hello guys i'm facing a problem with my code, i have a jsp form that send a file into a servlet, and when i try to extract the file using request.getParts() it return null value wheni try to print it to the console, can anyone help me please. here is my code.
my jsp:
<!DOCTYPE html>
<html lang="en">
<head>
<title>File Upload</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<form method="POST" action="/PartsServlet" enctype="multipart/form-data" >
File:
<input type="file" name="file" id="file" /> <br/>
Destination:
<input type="text" value="/tmp" name="destination"/>
</br>
<input type="submit" value="Upload" name="upload" id="upload" />
</form>
</body>
</html>
My servlet:
package Servv;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class PartsServlet
*/
#WebServlet("/PartsServlet")
public class PartsServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* #see HttpServlet#HttpServlet()
*/
public PartsServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
System.out.println("Get Parts "+request.getPart("file"));
System.out.println("Get Parts "+request.getPart("destination"));
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
Add #MultipartConfig annotation.
Always parse your request body only once and store it in a list.
so that one part cannot consume it.
List<Part> fileParts = request.getParts().stream().filter(part -> "file".equals(part.getName())).collect(Collectors.toList());
for (Part part : fileParts) {
}
File uploads = new File("/path/to/uploads");
File file = File.createTempFile("somefilename-", ".ext", uploads);
try (InputStream input = part.getInputStream()) {
Files.copy(input, file.toPath(), StandardCopyOption.REPLACE_EXISTING);
}
I'm very new to FullCalendar and I seriously don't know how to adapt it according to my project requirements. Chose it because my Lecturer wants me to. I am aware that fullcalendar is drag and drop function. What i'm trying to do is have an add button for each cell in my fullcalendar page then when I click add it will go to another jsp page (Add Events). Then I have date inputs (java.sql.Date) so this dates must match to full calendar date.I'm So sure that it's some logic here in index.jsp that needs to be done like if and else statement. If mysql date match to fullcalendar date,you display in that cell. Now what it's doing is print out date in every cell from database.And I just need to display the Title. Refer to the pictures attached :)
RetrieveServlet: Retrieve from AddEventsServlet (for adding events)
ackage servlet;
import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import database.DBAO;
import model.AddEvents;
/**
* Servlet implementation class RetrieveServlet
*/
#WebServlet("/RetrieveServlet")
public class RetrieveServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* #see HttpServlet#HttpServlet()
*/
public RetrieveServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//response.getWriter().append("Served at: ").append(request.getContextPath());
doPost(request,response); //dispatcher sents deget request, since ur code is in dopost, u will need to all it.
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try
{
DBAO myDatabase = new DBAO();
ArrayList <AddEvents> myEventList = myDatabase.getAddEvents();
System.out.println(myEventList.size());
request.setAttribute("EventList",myEventList);
request.getRequestDispatcher("index.jsp").forward(request, response);
}catch(Exception ex)
{
System.out.println("Error Accessing Database:" +ex.getMessage());
}
}
}
AddEventsServlet:
package servlet;
import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.ListIterator;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import database.DBAO;
import model.AddEvents;
/**
* Servlet implementation class AddEventsServlet
*/
#WebServlet("/AddEventsServlet")
public class AddEventsServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* #see HttpServlet#HttpServlet()
*/
public AddEventsServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//doGet(request, response);
AddEvents myEvent = new AddEvents();
//create an object based on the Java class customers
//DateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
//Assignment of data
myEvent.setTitle(request.getParameter("Title"));
myEvent.setEventDesc(request.getParameter("EventDesc"));
myEvent.setStartTime(request.getParameter("StartTime"));
myEvent.setEndTime(request.getParameter("EndTime"));
myEvent.setBudget(Double.valueOf(request.getParameter("Budget")));
myEvent.setStartDate(java.sql.Date.valueOf(request.getParameter("StartDate")));
myEvent.setEndDate(java.sql.Date.valueOf(request.getParameter("EndDate")));
myEvent.setEnvironment(request.getParameter("Environment"));
System.out.println(request.getParameter("Title"));
System.out.println(request.getParameter("EventDesc"));
System.out.println(request.getParameter("StartTime"));
System.out.println(request.getParameter("EndTime"));
System.out.println(request.getParameter("Budget"));
System.out.println(request.getParameter("StartDate"));
System.out.println(request.getParameter("EndDate"));
System.out.println(request.getParameter("Environment"));
System.out.println("Title="+myEvent.getTitle());
System.out.println("EventDesc="+myEvent.getEventDesc());
System.out.println("StartTime="+myEvent.getStartTime());
System.out.println("EndTime="+myEvent.getEndTime());
System.out.println("Budget="+myEvent.getBudget());
System.out.println("StartDate="+myEvent.getStartDate());
System.out.println("EndDate="+myEvent.getEndDate());
System.out.println("Environment="+myEvent.getEnvironment());
try
{
DBAO myDatabase = new DBAO();
ArrayList <AddEvents> myEventList = myDatabase.getAddEvents(); //not needed
//AddEvents myEventDetails =myDatabase.isEvent(myEvent,title, eventDesc, StartTime, EndTime, Budget); //not needed
HttpSession myRequest = request.getSession(true); //not needed
request.setAttribute("EventList",myEventList); //not needed
System.out.println(myEventList.size()); //not needed
// you comment out the method that insert data to database
myDatabase.AddEvents(myEvent);
// the dispatcher can go to RetrieveServlet and let it handle the retrieve
//myDatabase.delete(myEvent,title,eventDesc,StartTime,EndTime,Budget,StartDate,EndDate);
//name of delete database
request.getRequestDispatcher("index.jsp").forward(request, response);
}catch(Exception ex)
{
System.out.println("Error Accessing Database:" +ex);
}
}
}
index.jsp: Displaying the full calendar
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<%#page import="model.AddEvents,java.util.ArrayList,java.util.ListIterator" %>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<script type="text/javascript" src= "https://code.jquery.com/jquery-3.2.1.min.js">
$(document).ready(function() {
var date = new Date();
var d = date.getDate();
var m = date.getMonth();
var y = date.getFullYear();
var events_array = [
{
title: 'Test1',
start: new Date(2012, 8, 20),
tip: 'Personal tip 1'},
{
title: 'Test2',
start: new Date(2012, 8, 21),
tip: 'Personal tip 2'}
];
$('#calendar').fullCalendar({
header: {
left: 'prev,next today',
center: 'title',
right: 'month,agendaWeek,agendaDay'
},
dayClick: function(date, jsEvent, view) {
alert('Clicked on: ' + date.format());
alert('Coordinates: ' + jsEvent.pageX + ',' + jsEvent.pageY);
alert('Current view: ' + view.name);
// change the day's background color just for fun
$(this).css('background-color', 'red');
},
selectable: true,
events: events_array,
eventRender: function(event, element) {
element.attr('title', event.tip);
}},
$('#datepicker').datepicker({
inline: true,
onSelect: function(dateText, inst) {
var d = new Date(dateText);
$('#fullcalendar').fullCalendar('gotoDate', d);
}
}));
function changeDate() {
var StartDate = $('#datepicker').val();
$('#calendar').fullCalendar('gotoDate', startDate);
}
});
</script>
<title>Calendar</title>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" type="text/css" rel="stylesheet" />
<link href="https://cdnjs.cloudflare.com/ajax/libs/fullcalendar/2.6.1/fullcalendar.min.css" type="text/css" rel="stylesheet" />
</head>
<body>
<a class= "add_event_label" href="https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_textarea"></a>
<div class="container">
<div class="row">
<div class="col-xs-12">
<h1>Calendar</h1>
<div id="bootstrapModalFullCalendar"></div>
</div>
</div>
</div>
<!-- this is the pop up window when you press the button -->
<div id="fullCalModal" class="modal fade">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span> <span class="sr-only">close</span></button>
<h4 id="modalTitle" class="modal-title"></h4>
</div>
<div id="modalBody" class="modal-body">
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
<a class="btn btn-primary" id="eventUrl" target="_blank">Event Page</a>
</div>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.8.2/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/fullcalendar/2.6.1/fullcalendar.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<script>
$(document).ready(function() {
$('#bootstrapModalFullCalendar').fullCalendar({
header: {
left: '',
center: 'prev title next',
right: ''
},
//action after calendar loaded
eventAfterAllRender: function(view){
if(view.name == 'month')
{
//loop all .fc-day elements
$('.fc-day').each(function(){
//jQuery styling
$(this).css({ 'font-weight': 'bold', 'font-size': '100%'});
$(this).css('position','relative');
//add elements to each .fc-day, you can modify the content in append() with your own html button code
$(this).append('<a class="add_event_label" onclick="changeDate()" href ="AddEvent.jsp" style="position:absolute;bottom:0;left:0;right:0;display:block;font-size:12px;color:blue;cursor:pointer;">(+)</a>' );
<%!ArrayList<AddEvents> myEventList; //have to declear in a declaration tag for access in the page %>
<% myEventList = (ArrayList<AddEvents>) request.getAttribute("EventList");
if(myEventList.size() == 0)
{
%>
<h2>No events</h2>
<%
}
else
{
%>
<%
ListIterator<AddEvents> li = myEventList.listIterator();
while(li.hasNext())
{
AddEvents myEvent = new AddEvents();
myEvent= (AddEvents)li.next();
%>
//This part it should add data according to date, now it's just adding all the data of title.
$(this).append('<p><font size="1">Title:</font></p><p><font size="1"><%= myEvent.getTitle() %></font></p></p>');
<%}
%>
<%
}
%>
});
}
},
eventClick: function(event, jsEvent, view) {
//$(".fc-day-number").prepend("(+) ");
$('#modalTitle').html(event.title);
$('#modalBody').html(event.description);
$('#eventUrl').attr('href',event.url);
$('#fullCalModal').modal();
return false;
}
})
})
</script>
</body>
</html>
I am creating a project with JSP & Servlet (and entity beans) and I am trying to create a form where a user registers as a customer and is then redirected to a reservation page.
I want to keep the Id for the Customer that just registered and fill it into a disabled text field and then create a reservation on the next page. But whenever I try to load the customer class through jsp the whole application crashes with a NullPointerException.
It seems like the program crashes when it reaches the jsp-tags to fetch my customer, since it does print out the c.cPnr to the console as well as the test in the JSP-file.
<%# page import = "g24.isp.ejb.Customer" %>
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Welcome to Ski Village!</title>
<link rel="stylesheet" href="new/css/normalize.css">
<link rel="stylesheet" href="new/css/stylesheet.css">
<link href='https://fonts.googleapis.com/css?family=Fjalla+One|Poppins:400,500,600' rel='stylesheet' type='text/css'>
<script src="javascript/script.js" type="text/javascript"></script>
</head>
<body>
<% System.out.println("test"); %>
<% Customer c = (Customer) session.getAttribute("customer"); %>
<div id="container">
<!-- HEADER + MENU -->
<header>
<div class="logo"><!-- Ski Village Logo --></div>
<div class="menu">
<ul>
<li> Home </li>
<li class="left-menu"> About </li>
<li class="right-menu"> Book </li>
<li> <a href="index.html" > Test</a></li>
</ul>
</div>
</header>
<!-- PAGE CONTENT -->
<div id="wrapper">
<div class="center-form">
<form action="/HotelClient/HotelServlet" name="resForm" method="post">
<input type="text" name="cPnr" value="<%= c.getcPnr() %>" >
<input type="number" name="week" min="1" max="52" placeholder="Select week" >
<select name="cno">
<option value="1">Adventure Cabin
</option>
<option value="2">Cozy Cabin
</option>
<option value="3">Snowy Cabin
</option>
<option value="4">Hacker Cabin
</option>
</select>
<input type="submit" name="checkres" value="Check availability">
<input type="submit" name="submitresform" value="Create reservation" type="hidden">
<input name="operation" value="bajskorv" type="hidden">
</form>
</div>
<!-- FOOTER + SOCIAL ICONS -->
<footer>
<img src="img/facebook-logo.png" class="social-icon" alt="facebook logo">
<img src="img/instagram-logo.png" class="social-icon" alt="instagram logo">
<img src="img/twitter-logo.png" class="social-icon" alt="twitter logo">
<p>© 2016 | Ski Village</p>
</footer>
</div>
</div>
</body>
</html>
Servlet code:
package g24.isp.servlets;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.ejb.EJB;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import g24.isp.ejb.Cabin;
import g24.isp.ejb.Customer;
import g24.isp.ejb.Hotel;
import g24.isp.ejb.Reservation;
import g24.isp.facade.Facade;
import g24.isp.facade.FacadeLocal;
import g24.isp.ejb.MethodClass;
/**
* Servlet implementation class HotelServlet
*/
#WebServlet("/HotelServlet")
public class HotelServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
#EJB
private FacadeLocal facade;
/**
* #see HttpServlet#HttpServlet()
*/
public HotelServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
PrintWriter out = response.getWriter();
out.println("MainServlet-doGet");
out.close();
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
String url = "did not get an url";
// Get hidden field
String operation = request.getParameter("operation");
MethodClass mc = new MethodClass();
if (operation.equals("createcustomer")) {
String cPnr = request.getParameter("txtcPnr");
String cAddress = request.getParameter("txtcAddress");
String cPhone = request.getParameter("txtcPhone");
String cName = request.getParameter("txtcName");
if (facade.findByCpnr(cPnr) == null) {
Customer customer = new Customer();
customer.setcPnr(cPnr);
customer.setcAddress(cAddress);
customer.setcPhone(cPhone);
customer.setcName(cName);
facade.createCustomer(customer);
url = "/new/reservation.jsp";
} else {
url = "new/newcust.jsp";
}
}
else if (operation.equals("createreservation")) {
String cpnr = request.getParameter("txtcPnr");
int week = mc.ParseStringToInt(request.getParameter("week"));
int cno = mc.ParseStringToInt(request.getParameter("cno"));
Customer cs = facade.findByCpnr(cpnr);
Cabin cb = facade.findByCabinNo(cno);
if (cb != null && cs != null) {
Reservation res = new Reservation();
res.setCabin(cb);
res.setCustomer(cs);
res.setrDate(week);
facade.createReservation(res);
url = "/Index.jsp";
} else {
System.out.println("Did not enter if statement");
url = "/Index.jsp";
}
}
else if (operation.equals("newcustomer")) {
url = "/new/newcust.jsp";
}
else if (operation.equals("setcustomer")) {
System.out.println("Servlet - Create reservation");
String cpnr = request.getParameter("txtcPnr");
System.out.println(cpnr);
url = "/new/reservation.jsp";
Customer customer = facade.findByCpnr(cpnr);
if (customer != null) {
System.out.println(customer.getcName());
session.setAttribute("customer", customer);
url = "/reservation.jsp";
}
else {
System.out.println("Customer value is null");
}
}
System.out.println(url);
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(url);
dispatcher.forward(request, response);
}
}
May be it's not setting the session attribute and when c.getcPnr() gets executed, it throws NullPointerException. Can you check whether the attribute is set in the session? You can try printing out 'c' in the jsp.
I solved the problem - i was trying to find the customer by accessing the facade.findBycPnr() method.
The solution was to session.setAttribute(customer, cust) when creating the customer.