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Tag: jackson

JSON data mapping in Java with Jackson

I got stuck in mapping a json into my data structures “the easy way” using just Jackson decorators and I was wondering if there is a way to do this … The json that I try to read has the following structure: So basically every data entity has a “data_info” object (mapped in my code from below to DataTypeInfo) that

How to Serialise a JSON String to a JAVA Object using Jackson

I am having trouble in deserialising the below JSON String to a Java Object. The code below should work but i think my issue is with the mapper i am passing with it – The mapper i pass with it is like below : Alert.java AlertConfig.java JobConfig.java Error i get is : I am nor sure how to name the

Deserializing json to pojo where json field has different data types

I’m trying to deserialize json to java pojo and I can’t wrap my head around how should I begin to create a java object that could be used to deserialize json like this: I’m working with jackson and looking to use something like this: MyPojo response = mapper.readValue(jsonString, MyPojo.class) The biggest struggle is those “value” elements, where some fields contain

How can have springdoc-openapi use the @JsonValue enum format without changing toString?

I have a Spring Boot application using springdoc-openapi to generate Swagger API documentation for my controllers. One of the enums used in the JSON request/response has a different JSON representation than its value/toString(). This is achieved using the Jackson @JsonValue annotation: However, the generated Swagger API docs use the enum value (specifically, the value of toString()) rather than the JSON

How do I globally enable “strict” handling of LocalDate values using Jackson?

Jackson Java 8 Date/time module issue jackson-modules-java8#212 mentions enabling “strict” handling via a global default: Currently LocalDateDeserializer automatically accepts non-standard format where time part also exists. While this is useful for some use cases, compatibility, it seems reasonable that if user forces “strict” handling (via @JsonFormat, or global default), that part would not be accepted. However, I am completely failing

How to map a CSV to Object with List using CsvMapper?

I’m trying to map a Csv file to an Object what instances List of Objects using CsvMapper, is that even possible? Example: Content of Csv file (without header): Field 1: name Field 2: gender Field 3: hobby (List comma separated) Field 4: relation Example class: Thank you in advance. Answer I found myself a solution: I used common-cdv (apache) as

Getting NullPointerException while trying to deserialize json

I am getting NullPointerException while trying to deserialize json. I am trying to deserialize only select JSON objects from https://api.covid19india.org/data.json I have written code Statewise.java calling method Please help Answer The JSON returned contains “statewise” property. So to get it deserialized correctly you can either change the property List<Statewise> statewiseData to List<Statewise> statewise in your CovidData class or add JsonProperty

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