I need to be able to create a Java POJO from a JSON object when I only have an interface that can’t be changed. I’m hoping that Mixins can help make this possible. I created a Mixin that hopefully will work but can’t get Jackson to use it. It appears that Jackson is ignoring the Mixin I am d…
Tag: jackson
Lombok returns null as a value of response
I’ve got a problem with my Api tests. When i’m trying to get data from api, lombok returns null as an acceptance value, but there are values with real numbers in api. Screenchot: https://prnt.sc/w98nt2 My DTO for the responce: My steps that extacts body and send post request public class PositionS…
Restrict string data type to only string types for request body in Spring boot 2.4 (Jackson)
I have created my request POJO as follows when I send request body as follow, it is working fine. But when I sent like below Here is my controller Expected: throw some error Actual: converting true value for userId to string by jackson. please let me know is there a way to acheive the Expected behaviour Answe…
Unable to find data in DTO from JSON object – parsing error ZonedDateTime
I am trying to convert the JSON timestamp object into Java I have researched converting a JSON string to java but unsure what I’m looking for. I can get it to work if the JSON uses an array but unfortunately it does not use this approach. JSON Payload Event DTO Update DTO Answer To resolving the parsing…
Jackson deserialization: Can I inject a value with an annotation on the field of the to deserializable object?
I have an object like this to deserialize: whereas the class Relation looks like this: RelationType is en enum and is not a value which will be deserialized, while all others are. Is it possible, that I could “inject” the enum value for the field relationType with an annotation on the field in the…
How to serialize a class that extends TreeSet with Jackson?
Class A looks like this: Class B: When I serialize a class A object using Jackson: I get a json Array like this: but the member variables a,b,c are missing. Is there a way I can include them into the json string? Answer Jackson recognises class A as a collection and register CollectionSerializer to serialise …
How do you modify default enum (de)serialization for non-annotated enums but retain standard behavior (@JsonProperty/@JsonValue/…) in Jackson?
Currently jackson (uncustomized) serializes enums like this: If there is @JsonProperty or @JsonValue, they are used to derive serialized name Otherwise, standard serialization is carried out: index or toString() might be used (depending on the mapper settings), or .name() is called by default For deserializat…
How to avoid Jackson escaping double quotes in Java?
I am working on a project and wanted to rewrite some code written in Gson to Jackson using ObjectMapper. So I am trying to create a JSON string using some properties as below: Expected result: Actual: So once I create a JSON String using Jackson, it turns out it is escaping double quotes for field names and v…
Spring Boot – Jackson EntityNotFoundException returns 200 instead of 500 response
Exception handler is returning 200 response even though I have specified it to return 500 in the handler (HttpStatus.INTERNAL_SERVER_ERROR) when encountering this exception. I am using Spring Boot v1.5.4.RELEASE. I am calling a Spring Boot service returning a JSON object. I am using a custom exception handler…
Mapping to “” instead of null Jackson
I have a function that reads XML from a Kafka topic into String format, which I then want to convert to a JSON Object. Example XML: I then have POJO Classes such as: (with lombok getter/setter/toString and jackson annotation imports) I am then using a MappingJackson2XmlHttpMessageConverter to get an Object Ma…