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I have a class JobRequest

public class JobRequest {

    private String type;
    @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.EXTERNAL_PROPERTY, property = "type")
    @JsonSubTypes({
            @JsonSubTypes.Type(value = AJobDetails.class, name = "A"),
            @JsonSubTypes.Type(value = BJobDetails.class, name = "B")
    })
    private JobDetails job;
}

The issue is the key 'job' might not be present or null in the recieved JSON. When the model is initialised it throws an error.

MismatchedInputException: Missing property 'job' for external type id 'type' Tried JsonInclude, defaultImpl=Void.class, and Optional.

In case of Optional, error is gone, but populated values are also populated as null.

本文标签： How to allow nullable fields along with JsonTypeInfo in Spring Boot and JacksonStack Overflow

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