MN:4.4.0 - Changed behavior for @JsonGetter in @Introspected-annotated classes

[roar-skinderviken]

Expected Behavior

With the example application and MN:4.4.0, I expect this JSON as output from the controller.

{"afterCare":[{"klassifisering":{"regionKode":"01"},"stats":{"SomeField1":0,"SomeField2":0}}]}

Actual Behaviour

This is a simplistic reconstruction of what happened:

{"afterCare":[{"klassifisering":{"regionKode":"01"},"stats":{"SomeField1":0,"SomeField2":0}}]}

changed to

{"afterCare":[{"klassifisering":{"regionKode":"01"},"stats":{"shouldNotAppearInJson":{"SomeField1":0,"SomeField2":0}}}]}

with MN:4.4.0.

Steps To Reproduce

1. In the example application, switch to MN:4.4.0 in gradle.properties.
2. Start the application with ./gradlew clean run
3. Open http://localhost:8080/get-aggregation

Observe that JSON has changed to

{"afterCare":[{"klassifisering":{"regionKode":"01"},"stats":{"shouldNotAppearInJson":{"SomeField1":0,"SomeField2":0}}}]}

Please note that removing @Introspected fixes the issue.

Environment Information

JDK 21
Kotlin 1.9.23
Ubuntu 22.04

Example Application

https://github.com/roar-skinderviken/MN-4.4-jackson-issue

Version

4.4.0

[timyates]

@dstepanov Any ideas?

[dstepanov]

It's probably some KSP stuff. I have added similar test to Micronaut Serialization and fixed some bug micronaut-projects/micronaut-serialization#826

[dstepanov]

Looks like the annotation is not retained in the property annotations

[roar-skinderviken]

Seems like you're right about KSP @dstepanov. When replacing it with kotlin("kapt") version "1.9.23", returned JSON is as expected.

[timyates]

It might be us, as changing the field name in the reproducer to be different to the JsonGetter name seems to work

diff --git a/gradle.properties b/gradle.properties
index ab4cf7a..c3fd1bb 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,3 @@
-micronautVersion=4.3.8
+micronautVersion=4.4.0
 kotlinVersion=1.9.23
 org.gradle.jvmargs=-Xmx4096M
diff --git a/src/main/kotlin/no/javatec/viewmodel/ClassificationAndStats.kt b/src/main/kotlin/no/javatec/viewmodel/ClassificationAndStats.kt
index 3972f0b..3ecf94a 100644
--- a/src/main/kotlin/no/javatec/viewmodel/ClassificationAndStats.kt
+++ b/src/main/kotlin/no/javatec/viewmodel/ClassificationAndStats.kt
@@ -9,8 +9,8 @@ data class ClassificationAndStats<out T : StatsEntry>(
     val klassifisering: ClassificationVars,
     /** Ignore field to avoid double wrapping of values in resulting JSON */
     @JsonIgnore
-    val stats: T
+    val spats: T
 ) {
     @JsonGetter("stats")
-    fun getValues(): Map<Aggregation, Int> = stats.shouldNotAppearInJson
+    fun getValues(): Map<Aggregation, Int> = spats.shouldNotAppearInJson
 }

[roar-skinderviken]

Working now with MN:4.4.1 👍