An empty JSON field which is a boolean/nullable field in Java model, is getting converted as null

An empty JSON field which is a boolean/nullable field in Java model, is getting converted as null

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An empty JSON field which is a boolean/nullable field in Java model, is getting converted as null
Tag : java , By : Malikul
Date : January 11 2021, 03:34 PM

Does that help You need to disable MapperFeature.ALLOW_COERCION_OF_SCALARS feature which allows coercion in cases like you have. See below example:
import com.fasterxml.jackson.databind.MapperFeature;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonApp {

    public static void main(String[] args) throws Exception {
        String json = "{\"indicator\":\"\"}";

        ObjectMapper mapper = new ObjectMapper();
        System.out.println(mapper.readValue(json, BaseClass.class));

class BaseClass {
    private Boolean indicator;

    public Boolean getIndicator() {
        return indicator;

    public void setIndicator(Boolean indicator) {
        this.indicator = indicator;

    public String toString() {
        return "BaseClass{" +
                "indicator=" + indicator +

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Prevent removing field in json if field is empty and field is required angularjs

Tag : angularjs , By : Robert Daniel Pickar
Date : March 29 2020, 07:55 AM
it helps some times If I understand the question correctly, you could set the values in your controller like this:
   .controller('MyCtrl', function ($scope) {

   // ...

   $scope.user = {
       firstname: '',
       lastname: '',

   // ...

<form name="frmSample">
    <input type="text" ng-model="user.firstname" />
    <input type="text" ng-model="user.lastname" />

django not nullable error on model field containing null-True

Tag : django , By : D B
Date : March 29 2020, 07:55 AM
I hope this helps you . Delete all migration scripts. Add null=True means it can be NULL in the database, blank=True means that it can be left blank in forms.
python manage.py makemigrations
python manage.py migrate

Null field in JSON: empty quotes, null value, or remove field?

Tag : java , By : perl
Date : March 29 2020, 07:55 AM
This might help you Let's suppose that your are trying to infer types to your fields, thus an hypothetical one named f usually contains numbers.
That makes sense to me, for you are combining a strongly typed language with a one that is not.

empty field or blank field or null field is not shown in php code

Tag : php , By : AJacques
Date : March 29 2020, 07:55 AM
To fix the issue you can do 1.remove 1 beside query code line.
2.Use _assoc() as you specified column-names in query.(Not compulsion, but will give you a lighter associative array)
$sql1="select a.code,a.empname,a.pfuidno from emplmast a "; // remove 1
$get1=mysqli_query($conn,$sql1) or die(mysqli_error());
$m_no = mysqli_num_rows($get1);
if ($m_no > 0){
    while($row1 = mysqli_fetch_assoc($get1)){ // use _assoc
        if ($row1['pfuidno']=='' || empty($row1['pfuidno']) || $row1['pfuidno'] === NULL){ //check for NULL
            $m_errmsg='UAN is Blank for Employee Code '.$row1['code'].' Name '.$row1['empname'];
            echo "<script language='javascript' type='text/javascript'>alert('$m_errmsg')</script>";

How can I append an empty array field into a JSON if a JSON field is null?

Tag : javascript , By : TBG
Date : March 29 2020, 07:55 AM
it fixes the issue You need to assign an object with a new property for the array, because you try to use a property SubSpeciesList, which does not exist.
if (finalResponse.SubSpeciesInfo === null) {
    log.info("NO SUBSPECIES");
    finalResponse.SubSpeciesInfo = { SubSpeciesList: [] };
var finalResponse = {
  SubSpeciesInfo : null 

if(finalResponse.SubSpeciesInfo === null) {
    console.log("NO SUBSPECIES");
    finalResponse.SubSpeciesInfo = {SubSpeciesList : []};

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