Why @JsonProperty not work for camel case properties in Kotlin

Question

There is a very simple class:

class Price(
    @JsonProperty("YPRICE")
    val yprice: String? = null,

    @JsonProperty("ZPRICE")
    val zPrice: String? = null
)

And the following code to serialize to string:

val mapper = ObjectMapper().registerKotlinModule()
mapper.writeValue(System.out, Price())

The result in console is:

{"YPRICE":null,"zprice":null}

If changing the property of zPrice to zprice, then the result changes to:

{"YPRICE":null,"ZPRICE":null}

And if changing the property of yprice to yPrice, then the result changes to:

{"yprice":null,"zprice":null}

It seems that @JsonProperty does not work for the camel case properties.

Not sure how it is in javascript but, in java you might be able to just configure `mapper.configure(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES, true);` — duppydodah, Aug 02 '21 at 14:54

score 3 · Accepted Answer · edited Nov 17 '21 at 16:14

3

You need to instruct ObjectMapper to generate JSON properties based on fields and not based on getter methods. You can use com.fasterxml.jackson.annotation.JsonAutoDetect annotation:

@JsonAutoDetect(getterVisibility = JsonAutoDetect.Visibility.NONE, fieldVisibility = JsonAutoDetect.Visibility.ANY)
class Price(

Since now, in all cases you should see the same result.

Take a look at:

edited Nov 17 '21 at 16:14

Richa Shah

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answered Aug 02 '21 at 15:35

Michał Ziober

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Thanks a lot. It works. But may I know the reason for the case please? Why it shows different result for camel case and not. – Tonny Tc Aug 03 '21 at 01:26

Why @JsonProperty not work for camel case properties in Kotlin

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