Field names are being lowercased automatically when the first word of the camel-case is too short

[hanzo2001]

I don't know if this is a feature or a bug but a quick search didn't return anything (or I didn't see it), or if this is something that only happens for Kotlin users.

I am using 2.12.4 but just in case, my POM has

    <dependencies>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.12.4</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.12.4</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.12.4</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.module</groupId>
            <artifactId>jackson-module-kotlin</artifactId>
            <version>2.12.4</version>
        </dependency>
    </dependencies>

The following may be run in a scratch.kt

import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper

val m = ObjectMapper()
val j = jacksonObjectMapper()

data class A(val someValue: String = "")
data class B(val sValue: String = "")
data class C(val rPoi: String = "")

m.writeValueAsString(A("cow").also(::println)).also(::println)
m.writeValueAsString(B("cow").also(::println)).also(::println)
m.writeValueAsString(C("cow").also(::println)).also(::println)

The output shows that the fields with short first word in the camel-case are being lowercased

A(someValue=cow)
{"someValue":"cow"}
B(sValue=cow)
{"svalue":"cow"}
C(rPoi=cow)
{"rpoi":"cow"}

I currently don't have an issue with this but it stumped me for a while because some of my Apache Camel routes started failing. I fixed it simply by using longer first names and it just works as expected.

Please let me know if I should try some other version. This is very easy to test as all I have to do is spin up a scratch (IntelliJ/IDEA) file and run it.

[cowtowncoder]

Chances are this is due to Kotlin module's special handling of names, attempting to follow deviations Kotlin has from Java Beans specification (and sometimes from field-first aspect). So will transfer to Kotlin module; may be moved back if reproducible with plain Java test.

[k163377]

The issue of property names in the serialization result differing from the definition in Kotlin will be addressed in #630. This issue be closed as a duplicate.