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Can't deserialize JSON array into class org

I want to make a string from json into an object of my class. The problem is, in the class I use an ArrayList and that's why (I think) I get the error message "Can't deserialize JSON array into class". How exactly can I separate the array and convert it into an ArrayList?
#POST
public Response createMocktail(String m){
MocktailDto mocktail = jsonb.fromJson(m, MocktailDto.class);
return Response.ok(mocktailManager.createMocktail(mocktail)).build();
}
Json String:
[
{
"id": 3,
"name": "Mojito",
"zutaten": [
{
"anzahl": 1,
"id": 5,
"name": "Rum"
},
{
"anzahl": 1,
"id": 6,
"name": "GingerAle"
}
]
}
]
JSONObject jsonObj = new JSONObject(m); does not work, it says constructor is undefined although I saw a few solutions like this

The problem is your input string is Array (when it starts with [)
There are a few possible solutions:
First:
MocktailDto[] data = jsonb.fromJson(m, MocktailDto[].class);
data[0];
Second:
Type listType = new TypeToken<ArrayList<MocktailDto>>(){}.getType();
ArrayList<MocktailDto> data = jsonb.fromJson(m, listType);
data.get(0);

Update Json value in json Array in Java

{
"page": {
"size": 2,
"number": 2
},
"places": [
{
"eventName": "XYZ",
"createdByUser": "xyz#xyz.com",
"modifiedDateTime": "2021-03-31T09:59:48.616Z",
"modifiedByUser": "xyz#xyz.com"
}
]}
I am trying to update the "eventName" field with new String. I tried with the following code, It updates the field but returns only four fields in the json array.
public String modifyJson() throws Exception{
String jsonString = PiplineJson.payload(PiplineJson.filePath());
System.out.println(jsonString);
JSONObject jobject = new JSONObject(jsonString);
String uu = jobject.getJSONArray("places")
.getJSONObject(0)
.put("eventName", randomString())
.toString();
System.out.println(uu);
return uu;
}
This is what the above code does.
{
"eventName": "ABCD",
"createdByUser": "xyz#xyz.com",
"modifiedDateTime": "2021-03-31T09:59:48.616Z",
"modifiedByUser": "xyz#xyz.com"
}
I am trying to get the complete json once it updates the eventName filed.
{
"page": {
"size": 2,
"number": 2
},
"places": [
{
"eventName": "ABCD",
"createdByUser": "xyz#xyz.com",
"modifiedDateTime": "2021-03-31T09:59:48.616Z",
"modifiedByUser": "xyz#xyz.com"
}
]}

The problem is the way that you are chaining the operations together. The problem is that you are calling toString() on the result of the put call. The put calls returns the inner JSONObject that it was called on. So you end up serializing the wrong object.
Changing this:
String uu = jobject.getJSONArray("places")
.getJSONObject(0)
.put("eventName", randomString())
.toString();
to
jobject.getJSONArray("places")
.getJSONObject(0)
.put("eventName", randomString());
String uu = jobject.toString();
should work.

That's because you are returning the first element you extracted from "places" array. You should return "jobject.toString()" instead.

Deserialize complex json body, validate one element in it, then through that, map to another element (JAVA) is it possible?

I have a json array to work with, like so:
[
{
"id": "12345",
"eauthId": "123451234512345123451234512345",
"firstName": "Jane",
"middieInitial": "M",
"lastName": "Doe",
"email": "janedoe#usda.gov",
"roles": [
{
"id": "CTIS_ROLE_ID",
"name": "A test role for CTIS",
"treatmentName": "Fumigation"
}
]
},
{
"id": "67890",
"eauthId": "678906789067890678906789067890",
"firstName": "John",
"middieInitial": "Q",
"lastName": "Admin",
"email": "johnadmin#usda.gov",
"roles": [
{
"id": "CTIS_ADMIN",
"name": "An admin role for CTIS",
"treatmentName": "System Administration"
}
]
}
]
My task is to find out the user's "roles" --> "name", once match, get that user's email address and sign in using that email address. It seems like a simple task, but it has been really kicking my bottom, since digging into API is new to me. I've tried different libraries (Jackson, RestAssured, Json Simple) and finally GSon. I don't have time to sit and study everything from the scratch. I just needed a quick solution. But it definitely hasn't been quick. Is anyone kind enough to help me out with this. I'd really appreciate it.
closeableHttpResponse = restClient.get(ConfigurationReader.get("base_url") + ConfigurationReader.get("user_endpoint"));
//Status code
int statusCode = closeableHttpResponse.getStatusLine().getStatusCode();
System.out.println("statusCode = " + statusCode);
String responseString = EntityUtils.toString(closeableHttpResponse.getEntity(), "UTF-8");
Type userListType = new TypeToken<List<Users>>(){}.getType();
List<Users> users = (List<Users>) new Gson().fromJson(responseString, userListType);
Roles roles = new Gson().fromJson(responseString, Roles.class);
it gives me this error
com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:226)
at com.google.gson.Gson.fromJson(Gson.java:932)

The problem with your code is
Type userListType = new TypeToken<List>(){}.getType();
List users = (List) new Gson().fromJson(responseString, userListType);
You are not receiving just a list, you are actually deserializing an array of lists.
So try this:
List[] users = (List[]) new Gson().fromJson(responseString, List[].class);

How to get string values in to json and fetch message value from below request [duplicate]

This question already has answers here:
How to parse JSON in Java
(36 answers)
Closed 6 years ago.
{
"Header": {
"AppId": "appiddfdsf324",
"RecId": "fdsfrecid79878_879898_8797",
"SecureRefId": "fsdf5679567fsd_6789678",
"Type": "Other",
"Ver": "9.0.0",
"StartTS": "2016-09-26:07:48.798798-04:00"
},
"Application": {
"APP_OS": "Windows",
"APP_Runtime": ".Net67986",
"APP_AppName": "MPS",
"APP_AppVersion": "9.0.0.0",
"Host": "fsdhajkfh657895fsdajf",
"Channel": "N/A",
"APP_ReqId": "2f3d7987987-78987-987987-897-da"
},
"Service": {
"Key": "modification process",
"CallType": "HGDL",
"Operation": "processrequest",
"Port": "n/a"
},
"Results": {
"Elapsed": 0,
"Message": "Message Succesfully Deleted",
"TraceLevel": "Information"
},
"Security": {
"Vendor": "abfsdf"
},
"Extended_Fields": {
"CustomerId": "4564987987",
"MessageId": "768789fsdafasdf987987987fasdf",
"TimeElapsed": "1272.8171"
}
}
in above string value we are capturing from website result values we will get in a string format by using selenium webdriver.
This i need to convert and read value of "Message"
Note : i have tried below code
JsonElement jelement = new JsonParser().parse((String) elementText);
JsonObject jobject = jelement.getAsJsonObject();
jobject.getAsJsonObject("Results");
This above will provide complete result value of Result json but i required to fetch values which is present with "Message"

Below first line creates the JSONObject by passing String [which is of JSON format and it should be in JSON format, otherwise it will through an exception]
In Second line , as you have a JSON Object now, you can fetch any element from that,
e.g to fetch the value for Message, which is an element of "Results" object which is of JSON type,
we can access any element by using . and depending on what are you fetching use get
e.g getString -> for getting String,
getInt->for getting Integer,
JSONObject-> for getting an JSONObject
getJSONArray-> for getting a JSONArray
JSONObject jsonObj=new JSONObject(pass your String) //This converts in to JSON Object
jsonObj.getJSONOObject("Results").getString("Message"); //As result internally itself is a JSON Object

Jackson Error Unexpected character ('}' (code 125))

Hey i got an issue based on deserialization with jackson, here what i've tried and the error i got.
ERROR : com.fasterxml.jackson.core.JsonParseException: Unexpected character ('}' (code 125)): was expecting double-quote to start field name
Java Code
List<Contact> ds = mapper.readValue(data, mapper.getTypeFactory().constructCollectionType(List.class, Contact.class));
//OR this one
List<Contact> ds = mapper.readValue(data, new TypeReference<List<Contact>>() {});
My JSON
[
{
"id": "200",
"name": "Alexia Milano",
"email": "minalo#gmail.com",
"prenom": "xx-xx-xxxx,x - street, x - country",
}, {
"id": "201",
"name": "Johnny Depp",
"email": "johnny_depp#gmail.com",
"prenom": "xx-xx-xxxx,x - street, x - country",
}
]

If you use json validator, you can see more detailed error message:
Parse error on line 6:
...ntry", }, { "id
---------------------^
Expecting 'STRING'
you have extra comma there after "xx-xx-xxxx,x - street, x - country". If you remove it from both two places, you have valid JSON and Jackson parsing works.

It's because your last entries, there is an , after your last value. Thats why jackson expects another field.