Micronaut Serde Deserialization Does Not Send Explicit Null JSON Parameters to Kotlin Data Class Constructor #1175
Description
Expected Behavior
import io.micronaut.serde.annotation.Serdeable
import io.micronaut.test.annotation.TransactionMode
import io.micronaut.test.extensions.junit5.annotation.MicronautTest
import jakarta.inject.Inject
import kotlinx.coroutines.test.runTest
import org.junit.jupiter.api.Assertions.assertEquals
import org.junit.jupiter.api.Test
@MicronautTest(transactionMode = TransactionMode.SINGLE_TRANSACTION)
class AssessmentDaoTest @Inject constructor(
private val objectMapper: io.micronaut.serde.ObjectMapper
) {
@Serdeable
data class TestMe(
val testString: String? = "I AM DEFAULT"
)
@Test
fun testDefaultValues() = runTest {
val jsonWithNull = """{"testString": null}"""
val jsonWithMissing = """{}"""
// With nullIsSameAsDefault = false, a null in JSON overrides the default
val fromNull = objectMapper.readValue(jsonWithNull, TestMe::class.java)
println(fromNull) // MyData(value=null)
assertEquals(null, fromNull.testString) //FAILS - default value set
// A missing field still uses the default value
val fromMissing = objectMapper.readValue(jsonWithMissing, TestMe::class.java)
println(fromMissing) // MyData(value=default)
assertEquals("I AM DEFAULT", fromNull.testString)
}
}
Actual Behaviour
I would expect the assertion above, assertEquals(null, fromNull.effectiveStartDate) to pass and null to be set for the parameter instead of the default value.
Steps To Reproduce
No response
Environment Information
In application.yml:
micronaut.serde.serialization.inclusion: non_null
In build.gradle:
// Serialization
annotationProcessor mn.micronaut.serde.processor
implementation mn.micronaut.serde.jackson
kotlinVersion=2.1.0
micronautVersion=4.7.4
Example Application
https://github.com/joseFilA/ExampleMicronautSerdeKotlinDataClassIssue/tree/main
Version
4.7.4