Develop Reference

Why can't i input a null value?

I've been working on a little project with Java Spring. I've already set the table structure in Navicat to be able "null" values. I have also set the model to be able to null values.
But still, I can't input null values into the column and received this error messages.
FYI: I'm using Spring Tool Suite 3.9.7 IDE
Field error in object 'sertifikasihapus' on field 'modified_on': rejected value [];
codes [typeMismatch.sertifikasihapus.modified_on,typeMismatch.modified_on,typeMismatch.java.sql.Timestamp,typeMismatch];
arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [sertifikasihapus.modified_on,modified_on];
arguments [];
default message [modified_on]];
default message [Failed to convert property value of type 'java.lang.String' to required type 'java.sql.Timestamp' for property 'modified_on';
nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [#javax.persistence.Column java.sql.Timestamp] for value '';
nested exception is java.lang.IllegalArgumentException: Timestamp format must be yyyy-mm-dd hh:mm:ss[.fffffffff]]]
<script>
$('#idBtnHapusHapus').click(function() {
var vDataRole = $('#idFrmHapusSertifikasi').serialize();
var angka = $('#Id').val();
var nama = $('#idNamaSertifikasi').val();
if ($("#idModifiedOn").val().length < 1) {
$('#idModifiedOn').val(null);
debugger;
$.ajax({
url : './hapussertifikasi/' + angka,
type : 'Put',
data : vDataRole,
dataType : "json",
success : function(model) {
debugger;
window.location = './sertifikasi'
},
error : function(model) {
debugger;
}
});
} else {
debugger;
$.ajax({
url : './hapussertifikasi/' + angka,
type : 'Put',
data : vDataRole,
dataType : "json",
success : function(model) {
debugger;
window.location = './sertifikasi'
},
error : function(model) {
debugger;
}
});
}
});
</script>
<div class="col-xs-12">
<div class="row">
<form id="idFrmHapusSertifikasi" method="post">
<input type="hidden" class="form-control" id="Id" name="id"
placeholder="">
<input type="hidden" class="form-control"
id="idNamaSertifikasi" name="certificate_name" placeholder="">
<input type="hidden" class="form-control" id="idBulanBerlaku"
name="valid_start_month" placeholder="">
<input
type="hidden" class="form-control" id="idTahunBerlaku"
name="valid_start_year" placeholder="">
<input
type="hidden" class="form-control" id="idPenerbit" name="publisher"
placeholder="">
<input type="hidden" class="form-control"
id="idBulanBerlakuS" name="until_month" placeholder="">
<input
type="hidden" class="form-control" id="idTahunBerlakuS"
name="until_year" placeholder="">
<input type="hidden"
class="form-control" id="idCatatan" name="notes" placeholder="">
<input type="hidden" class="form-control" id="idCreateOn"
name="createOn" placeholder="">
<input type="hidden"
class="form-control" id="idCreateBy" name="createBy" placeholder="">
<input type="hidden" class="form-control" id="idModifiedOn"
name="modified_on" placeholder="">
<input type="hidden"
class="form-control" id="idModifiedBy" name="modified_by"
placeholder="">
</form>
<div class="col-xs-2">
<i class="glyphicon glyphicon-trash center" style="font-size: 50px"></i>
</div>
<div class="col-xs-8">
<div class="clTulisanHapus center" id="idTulisanHapus">
<p>Anda Yakin ingin menghapus Sertifikasi</p>
<!-- I WANTED THE CERTIFICATE NAME TO BE HERE -->
<div th:each="item:${oneprofil}">
<b><p th:text="${item.certificate_name}+' ?'"></p></b>
</div>
</div>
</div>
</div>
</div>
<div class="col-md-offset-8">
<div class="btn-group">
<input type="hidden" id="idDataId"> <input type="hidden"
id="idDataNama">
<button type="button" id="idBtnHapusBatal" data-dismiss="modal"
class="btn clBtnMdlHapus">Tidak</button>
<button type="button" id="idBtnHapusHapus" data-id="${item.id}"
class="btn clBtnMdlHapus">Ya</button>
</div>
</div>

Looks like your value is not null but an empty String (""). You can use the keyword null without any "quotation marks".
For more info, see this question:
in practice you can simply pretend that it's "merely a special literal that can be of any reference type".

[Failed to convert property value of type 'java.lang.String' to
required type 'java.sql.Timestamp' for property 'modified_on';
You are receiving the value as an empty string instead of null which leads to type mismatch and causing the issue.
From HTML I see that you are sending it as for hidden parameter. There is an alternative way to automatically set the creation date and modified date in Spring Boot.
Use below in Entity
#PrePersist
protected void prePersist() {
createdAt = set value here
}
#PreUpdate
protected void preUpdate() {
modifiedOn = set valye here
}
Hibernate
#CreationTimestamp - Documentation
#UpdateTimestamp - Documentation
Spring Data JPA
#CreatedDate - Documentation
#LastModifiedDate - Documentation

How do I solve this form issue with JSP using AJAX?

I want to send data from a form to a Servlet using Ajax, but when I made a check about the data that was being serialized using the jQuery .serialize() function, I noticed that it wasn't taking the value of the file field. In a previous test I got an error with a message like this: the request was rejected because there was no multipart data found
The following is the form HTML code:
<form id="frmCrcnCaso" class="form-horizontal" enctype="multipart/form-data">
<input id="txtNoVlt" name="txtNoVlt" type="text" class="form-control">
<input id="txtNmr" name="txtNmr" type="text" class="form-control">
<input id="txtFchOfc" name="txtFchOfc" type="date" class="form-control">
<input id="flAcvAjt" name="flAcvAjt" type="file" class="form-control"/>
</form>
<button id="btnGuardar" type="button" class="btn btn-lg btn-primary">
Guardar
</button>
And this is the javascript code:
$("#btnGuardar").on("click",function(){
ValidarGuardado();
});
function ValidarGuardado(){
...
// Activar el guardado
Guardar();
}// </editor-fold>
function Guardar(){
$(...).append("...
<button id='btnGdrCaso' type='button' class='btn btn-primary'><i class='fa fa-check'></i> Guardar</button>\n\
...");
$(...).modal();
$("#btnGdrCaso").on("click",function(){
...
var datosCaso = $("#frmCrcnCaso").serialize();
...
$.ajax({
url: "GuardarCaso" // Servlet name,
type: "POST",
contentType : false,
data: datosCaso,
success:function(r){
if(r === "1"){
...
}else if(r === "2"){
...
}else{
...
}
},
error:function(r){
...
}
});
});
}

Unable to retrieve PayPal success/cancel payment data from redirected urls in JAVA

Code to post PayPal form.
<body>
<form accept-charset="utf-8"
action="https://www.sandbox.paypal.com/au/cgi-bin/webscr" id="frm"
method="post">
<input type="hidden" name="business"
value="aaaa-facilitator#gmail.com"> <input
type="hidden" name="cancel_return"
value="http://localhost:8080/abc-jaxrs/web/cancel_redirection"> <input type="hidden"
name="cmd" value="_xclick"> <input type="hidden"
name="charset" value="utf-8"> <input type="hidden"
name="currency_code" value="USD"> <input type="hidden"
name="notify_url" value="http://localhost:8080/abc-jaxrs/web/success_redirection"> <input
type="hidden" name="return" value="http://localhost:8080/abc-jaxrs/web/success_redirection"> <input
type="hidden" name="item_name" value="123"> <input
type="hidden" name="amount" value="0.1">
</form>
<p style="text-align: center">
<h4>Redirecting To PayPal...</h4>
<script>
$(this.document).ready(function() {
$('.loaderparent').show();
var frm = $("form");
frm.submit();
});
</script>
Code to retrieve data from data from Java controller.
#RequestMapping(value = "/success_redirection", method = RequestMethod.GET)
public ModelAndView successRedirection(HttpServletRequest request, HttpServletResponse response) {
String itemName = (String) request.getAttribute("item_name"); // or
String itemNname = request.getParameter("item_name");
}
But getting itemName value as null in both cases.
So how to retrieve success/failure data from PayPal in JAVA.

Ensure enabling the Instant Payment Notification (IPN) from paypal account setting along with the success URL.
My Profile > My Selling Tools> Instant payment notifications >update then like below.

Insert form data into MySQL database using Rest Web Services using Java, AJAX

I am trying to insert a record into MySQL database using HTML form. I am using AJAX to call web services in Java. But it is not working. It gives an alert saying false. When I tried with POSTMAN it works fine. But using AJAX it's not working.
Can anybody help me? Thanks in advance.
Code in Add.jsp
<body>
<form id="submit">
Username:<br>
<input type="text" name="username"><br>
Email:<br>
<input type="email" name="email"><br><br>
Password:<br>
<input type="text" name="password"><br><br>
<input type="submit" value="Submit">
</form>
</body>
<script type="text/javascript">
$(document).ready(function() {
$("#submit").submit(function(event) {
event.preventDefault();
$.ajax({
type: "POST",
url: "http://localhost:8080/WebService/webresources/users/insert",
data: formToJSON(),
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data)
{
alert('Success');
},
error: function(jqXHR, textStatus, errorThrown)
{
alert('Error: ' + textStatus);
}
});
});
});
function formToJSON()
{
return JSON.stringify
({
"username": $('#username').val(),
"email": $('#email').val(),
"password": $('#password').val()
});
};
</script>
Code in Service
#POST
#Consumes(MediaType.APPLICATION_JSON)
#Path("/insert")
public boolean insertUsers(String content)
{
Gson g = new Gson();
Users u = (Users) g.fromJson(content, Users.class);
UsersDAO dao = new UsersDAO();
return dao.insertUsers(u);
}

You have to add id for all the input fields.
Try this.
<body>
<form id="submit">
Username:<br>
<input type="text" id="username" name="username"><br>
Email:<br>
<input type="email" id="email" name="email"><br><br>
Password:<br>
<input type="text" id="password" name="password"><br><br>
<button id="submit">Save</button>
</form>
</body>
And in this, You have to change this,
$("#submit").submit(function(event)
into this,
$("#submit").click(function(event)

Ajax call with spring MVC and Hibernate

I am trying to propagate the value in input type[text] whenever user is selecting one option from select box.
I have a form containing one select option and 3 input type(text) field. What i am trying to do here whenever user select one option from select box depending upon that option value some data i want to fetch from database and propagate to the same page in input type and then after clicking on submit button i want to store the data in database.
I have used ajax call for the same but the problem is that on selecting option value i am able to get the particular data but i am not able to get the same data in jsp input type, each time i need to reload the page manually.
userdetail.jsp
//imports are here
<html>
<head>
</head>
<body>
<script src="js/jquery.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
$(".name").change(function(){
var name = $(this).val();
if(name.length >= 1){
$(".status").html("<font color=gray> Checking availability...</font>");
$.ajax({
type: "POST",
url: "getparamfromdb.do",
data: "name="+name,
success: function(msg){
$(".status").ajaxComplete(function(event, request, settings){
$(".status").html(msg);
});
}
});
}
else{
$(".status").html("<font color=red>Username should be atleast <b>5</b> character long.</font>");
}
});
});
</script>
<div class="add">
<form:form method="post" action="addHealthParam.do" >
<table style="margin-top:-6%; margin-left:8%;">
Parameter Name:<br>
<select name="name" class="name">
<option value="select">Select</option>
<option value="Glucose, Serum">Glucose, Serum</option>
<option value="Uric Acid, Serum">Uric Acid, Serum</option>
<option value="Platelets">Platelets</option>
<option value="NRBC">NRBC</option>
</select>
Parameter Current Reading:
<input type="text" name="current_reading"/>
Unit of Measurement:
<select name="measurementunit" >
<option>
<c:forEach var="healthp" items="${paramvalue}">
${healthp.measurementunit}
</c:forEach>
</option>
</select>
Reference Range(Minimum):
<input type="text" name="minrange" value="
<c:forEach var="healthp" items="${paramvalue}">
${healthp.minrange}
</c:forEach>" >
Reference Range(Maximum):<br>
<input type="text" name="maxrange"
value="
<c:forEach var="healthp" items="${paramvalue}">
${healthp.maxrange}
</c:forEach>">
<input type="submit" value="Submit"/>
</body>
</html>
Controller class:-
imports are here
#Controller
#SessionAttributes
public class HealthParameterController {
#Autowired
BharatService service;
#Autowired
HibernateTemplate hibernateTemp;
List<HealthParameter> healthparam=null;
// to store the value in database.
#RequestMapping(value="/addHealthParam.do",method=RequestMethod.POST)
public String addHealthParam(#ModelAttribute("addhealthparam")HealthParamMVC addhealthparam,BindingResult result,HttpSession session){
// code to store the value in database
}
// execute through ajax call
#RequestMapping(value="/getparamfromdb.do",method=RequestMethod.POST)
public String gettingParam(#ModelAttribute("addhealthparam")
HealthParamMVC addhealthparam,BindingResult result,
HttpServletRequest req,HttpSession session){
System.out.println("In gettingParam ");
String name=addhealthparam.getName();
List<ParameterFromDB> li=service.getParamfromDb(name);
// further getting value from database based on name.
Iterator it=li.iterator();
while(it.hasNext()){
Object ob=it.next();
ParameterFromDB db= (ParameterFromDB) ob;
}
session.setAttribute("paramvalue", li);
// i have tried it with request also
//request.setAttribute("paramvalue", li);
return "userdetails";
}
}

Here is some modify code. please check and let me know it's working or not.
<html>
<head>
</head>
<body>
<script src="js/jquery.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
$(".name").change(function(){
var name = $(this).val();
if(name.length >= 1){
$(".status").html("<font color=gray> Checking availability...</font>");
$.ajax({
type: "POST",
url: "getparamfromdb.do",
data: "name="+name,
success: function(msg){
$(".status").ajaxComplete(function(event, request, settings){
var json = eval(msg);
$(".status").html(msg);
var minRange = json.MINRANGE;
vat maxRange = json.MAXRANGE;
$('#minrange').val(minRange);
$('#maxRange').val(maxRange);
});
}
});
}
else{
$(".status").html("<font color=red>Username should be atleast <b>5</b> character long.</font>");
}
});
});
</script>
<div class="add">
<form:form method="post" action="addHealthParam.do" >
<table style="margin-top:-6%; margin-left:8%;">
Parameter Name:<br>
<select name="name" class="name">
<option value="select">Select</option>
<option value="Glucose, Serum">Glucose, Serum</option>
<option value="Uric Acid, Serum">Uric Acid, Serum</option>
<option value="Platelets">Platelets</option>
<option value="NRBC">NRBC</option>
</select>
Parameter Current Reading:
<input type="text" name="current_reading"/>
Unit of Measurement:
<select name="measurementunit" >
<option>
<c:forEach var="healthp" items="${paramvalue}">
${healthp.measurementunit}
</c:forEach>
</option>
</select>
Reference Range(Minimum):
<input type="text" id="minrange" value="
<c:forEach var="healthp" items="${paramvalue}">
${healthp.minrange}
</c:forEach>" >
Reference Range(Maximum):<br>
<input type="text" id="maxrange"
value="
<c:forEach var="healthp" items="${paramvalue}">
${healthp.maxrange}
</c:forEach>">
<input type="submit" value="Submit"/>
</body>
</html>
i use response object here. you need to get that.
imports are here
#Controller
#SessionAttributes
public class HealthParameterController {
#Autowired
BharatService service;
#Autowired
HibernateTemplate hibernateTemp;
List<HealthParameter> healthparam=null;
// to store the value in database.
#RequestMapping(value="/addHealthParam.do",method=RequestMethod.POST)
public String addHealthParam(#ModelAttribute("addhealthparam")HealthParamMVC addhealthparam,BindingResult result,HttpSession session){
// code to store the value in database
}
// execute through ajax call
#RequestMapping(value="/getparamfromdb.do",method=RequestMethod.POST)
public String gettingParam(#ModelAttribute("addhealthparam")
HealthParamMVC addhealthparam,BindingResult result,
HttpServletRequest req,HttpSession session){
JSONObject json = new JSONObject();
JSONArray jsonArray = new JSONArray();
System.out.println("In gettingParam ");
String name=addhealthparam.getName();
List<ParameterFromDB> li=service.getParamfromDb(name);
// further getting value from database based on name.
Iterator it=li.iterator();
while(it.hasNext()){
Object ob=it.next();
ParameterFromDB db= (ParameterFromDB) ob;
String minRange = ""; // Create what you want to display in Minrange Text Box
String maxRange = ""; // Create what you want to display in Maxrange Text Box
}
json.put("MINRANGE",minRange);
json.put("MAXRANGE",maxRange);
//Get a RESPONCE object here.
PrintWriter out = response.getWriter();
out.print(json.toString());
session.setAttribute("paramvalue", li);
// i have tried it with request also
//request.setAttribute("paramvalue", li);
return "userdetails";
}
}