All Questions
Tagged with option-type json
63
questions
1
vote
2
answers
2k
views
How to make Jackson deserialize explicit null to Optional.EMPTY, but not to serialize empty Optional as null
Assuming I have a POJO like this:
public static class Test {
private Optional<String> something;
}
And a Jackson mapper like this:
var OBJECT_MAPPER = JsonMapper.builder()
.addModule(new ...
- 659
0
votes
1
answer
5k
views
Jackson - Deserializing JSON into an Object having an Optional field
I have an Optional<Double> field which I am trying to deserialize from a JSON, but getting the following Exception:
Cannot construct instance of `java.util.Optional`
(although at least one ...
- 3
0
votes
0
answers
69
views
Getting API data + Optional Problems
I'm struggling to get an optional type to a Label.text. It keeps on giving me "nil" value and won't change the text.
import UIKit
class VerifyPNViewController: UIViewController {
@...
- 5
1
vote
1
answer
991
views
In Avro schema, how to wrap the array to an object and put it as a union instead of putting just array as union
I have the following data and I want to wrap the OPTIONAL array as an object and then put in as a union but since I am new to this, I am not sure how to do this.
This is how I have done so far so ...
- 5,032
1
vote
2
answers
220
views
JSON deserialization: input DateTime? to output Option<DateTime>
Context:
one type has two representations: one in C# and one in F#. Value of the C# type gets serialized to json and then deserialized into a value of the F# type.
Is there a straightforward way to ...
- 4,936
0
votes
1
answer
96
views
Managing My Hibernate POJO NullPointerException Using Optional
Hi Guys I'm a bit confused in regards to using the Optional with the Java POJO Hibernate. As a Java dev we always complaining about NullPointerException, you need to check for null before you access ...
- 199
0
votes
1
answer
2k
views
SwiftUI Text View: When optional string is nil, expected default value is not working
Having trouble figuring out why code won’t display default value when variable is nil. Here’s the context below. Any pointers would be greatly appreciated.
Thanks!
EXAMPLE OF DATA FROM JSON API:
NOTE: ...
- 49
0
votes
1
answer
977
views
Runtime error when deserialiasing in Jackson - InvalidDefinitionException
I'm currently working on a bug fix for the azure-sdk-for-java and when trying to deserialise some JSON into a class with an Optional, I am getting an InvlidDefinitionException. What am I doing wrong? ...
- 313
0
votes
1
answer
574
views
A better way to extract the value of a field within an Option[JsValue] in scala?
I have a value in a JsObject which I want to assign to a specific key in Map, and I want to ask if there is a better way to extract that value without using a case matcher.
I have access to a request ...
- 21
0
votes
2
answers
465
views
Unwrap optional text from JSON
I have multiple strings returned from JSON and tried various options, but couldn't unwrap the optional content in it. Code snippet below
let parsedData = try JSONSerialization.jsonObject(with: data!,...
- 1
3
votes
1
answer
2k
views
How to parse json file with std::optional< std::variant > type in C++?
How can I parse nested json in c++? I am looking for a json parser that is capable of parsing nested json. Especially this field in the example json below:
optional<variant<bool, Secondary>&...
- 804
3
votes
0
answers
207
views
Deserialize to Optional<List<MyPojo>> explodes with HttpMessageNotWritableException
I am using jackson-datatype-jdk8 library to deserialize from json to Optional fields in my POJO, configured via:
objectMapper.registerModule(new Jdk8Module());
I am using Optional because I need to ...
- 421k
5
votes
3
answers
4k
views
Distinguish null from missing properties in Jackson using Kotlin data classes
I want to use Jackson to deserialize and later serialize jsons using Kotlin's data classes. It's important that I maintain the distinction between an explicitly null property, and a property which was ...
- 468
5
votes
1
answer
3k
views
Serializing Optional with Jackson: NON_ABSENT vs. configureAbsentsAsNulls and NON_NULL
When you want to serialize Optional with Jackson in Java, you must register the module Jdk8Module. This way, you either get the contained value or null.
Now if you also set serialization feature ...
- 51
5
votes
1
answer
3k
views
Custom Deserialization of Generic Types in Jackson Kotlin/Java
With this data model...
TestClass.kt
data class TestClass (val bar: Optional<Double>?)
My goal is to deserialize the following json values as such:
{"foo": 3.5} --> foo = 3.5
{"foo": ...
- 468