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Deserializing json with explicit null tags in the request not identified as null in java class constructor

I came across a strange problem today with Deserializing json with explicit null tags.
Below is the sample request and java code.
{
"name": "Jhon"
"address": "Earth"
"department" : [{
"depName": null,
"depId" : "1234"
}]
}
public class Department {
private String depName;
private String depId;
public Department(){
if(this.depName == null){
this.depName = "general";
}
}
}
If I remove the depName from the request the constructor gets called and depName is set as
"general"
If I keep it in the request, the constructor is called but depName is not set.
Why do I see this behavior and what is the solution to this.

How to deserialize json to nested custom map via gson?

I have the following json
{
"id": "1111",
"match": {
"username1": {
"id": "1234",
"name": "alex"
},
"username2": {
"id": "5678",
"name": "munch"
}
}
}
To deserialize it, I have the following data model class.
class json{
String id;
Match match;
}
class Match {
private Map<String,Profile> profiles
}
class Profile{
private String id;
private String name;
}
I am not getting any deserialization error when I am using gson but the
profiles variable is coming as null.
This is how I am deserializing.
var json = gson.fromJson(data,json.class)
inside the match object there can be a dynamic number of usernames not just two . Why am I getting profile object as null and how can I correctly populate it?
Making changes to json is the last resort here. I can make any other required changes.

The issue is your model. You don't need Match because profiles does not really exist in your JSON. You just json (this one with small changes) and Profile:
class json{
String id;
Map<String,Profile> match;
}
This will work.

POJOs declaration for different api with common fields

I need to create response POJOs class for a couple of APIs i have to call in my microservice . The response has a base structure given below.
{
"requestId": "abcd-1234-3456",
"sourceSystem": "HOME",
"response": {
"statusCode": "200",
"statusMessage": "Successfully Received",
"statusType": "SUCCESS",
"details": [
{
"message" : "hi"
}
]
}
}
Here the object inside the "details" property array can vary and can have different class definitions. Can someone help whether how should i declare my POJOs so that there is a common class for the common fields and a different set of classes for object inside details property . I tried few ways using java generics and #JsonSubType but that is giving some error Unrecognized field "details" during deserialisation.

Why don't you try and define it as object instead :-
class Response{
private String requestId;
private String statusMessage;
private String statusType;
private List<Object> details;
}

Convert string json inside a json to a object java

I have a string like this
"{
"scanReference": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
"document": {
"status": "data",
"data": {
"firstName": "FULL NAME",
"info": "{\"city\":\"CITY\",\"issueDate\":\"2019-01-01\"}"
},
"country": "USA"
}
}"
I have created class (simple POJO) to convert this to java object and using GSON. I am using the below code to convert to java object.
(gson.fromJson(response, MyClass.class));
But I am receiving the below error when converting , it because "info" is a string not json.
java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING
The code works as expected when I made "info" a json and tested it, but it is string here.
Can anyone help me to solve this problem?
PS: Thank you for help.

Create info class within MyClass.
Public class MyClass.class{
private String scanReference;
..........
private Info info
//Setter getter
}

How to create a simple json template to send body data with restassured?

So i am trying to build a json to send data to the body of my restassured request, like this structure here:
{
"id": 1,
"category": {
"id": 1,
"name": "duch"
},
"name": "benny",
"photoUrls": [
"string"
],
"tags": [
{
"id": 0,
"name": "string"
}
],
"status": "available"
}
So it is as simple as to copy this as string to the body of the request and i am done, i don't want that at all.
Is there a framework of sorts to give this structure and to change the data dynamically somehow?
I don't want this: (for example)
given().body("{\r\n\"city\": \"Hod Hasharon\",\r\n\"description\": \"Automation Hotel\",\r\n\"name\":\"Nir Great hotel\",\r\n\"rating\":5\r\n}")
.when().post("http://localhost:8090/example/v1/hotels").then().statusCode(201);
I want to be more flexible here, to reference some kind of object (A template with the option to change the data in some places?) that handles this stuff, is there something like that?

I think what you need is using POJO and Jackson to serialize it to json.
public class Payload {
private int id;
private String name;
private List<Tag> tags; //Tag is another class you need to create the same way
//getters, setters
}
And then using objects as payload in your request:
Payload payload = new Payload();
payload.setId(123);
payload.setName("John");
given().contentType("application/json").body(payload).when().post("http://example.com");
Also don't forget to add jackson-databind dependency to your project.
There's more about that in official documentation here: https://github.com/rest-assured/rest-assured/wiki/Usage#object-mapping