@JsonProperty is being ignored when property name (in camelCase notation) starts with a single letter

[fragonib]

Describe the bug
Jackson @JsonProperty annotation is being ignored when property name is in camelCase and first word consists in a single letter.

To Reproduce
Here is an example with two properties of same type but different name. Kotlin compiler places @JsonProperty on same place: constructor param. However, only originalName property name is replaced but aName is not.

class JsonAnnotationTest {

    private val mapper = ObjectMapper().registerModule(KotlinModule())

    @Test
    fun `JsonProperty annotation test`() {
        assertThat(mapper.writeValueAsString(EntityWithJacksonAnnotation()))
                .isEqualTo("""{"changedName1":"value","changedName2":"value"}""")
    }

}

data class EntityWithJacksonAnnotation(

        @JsonProperty("changedName1")
        val originalName: String? = "value",

        @JsonProperty("changedName2")
        val aName: String? = "value"

)

Expected behavior

Expected :{"changedName1":"value","changedName2":"value"}
Actual   :{"changedName1":"value","aname":"value"}

Versions
Kotlin: 1.3
Jackson-module-kotlin: 2.11.1
Jackson-databind: 2.11.1

[iivan91]

I have found the same issue too.

MyClass(val eTag: String) the eTag value is parsed as etag removing the capital letter T
This can be a big problem if a back-end sends me a json with capital letters in the second place of the properties, because Jackson can not find the property and fails.

[Blafasel3]

Any updates on this? I just encountered the same issue.

[k163377]

This issue will be fixed by #630 and therefore closed as a duplicate.