Fixed StrictNullChecks backend to use JsonSetter

from https://github.com/ProjectMapK/jackson-module-kogera/blob/ec6e5e644cc9574f461962e1246f87a42b8fab66/src/main/kotlin/io/github/projectmapk/jackson/module/kogera/annotationIntrospector/KotlinFallbackAnnotationIntrospector.kt#L116-L126

Author: k163377

src/main/kotlin/com/fasterxml/jackson/module/kotlin/KotlinModule.kt

@@ -125,7 +125,9 @@ class KotlinModule private constructor(
             nullIsSameAsDefault,
             useJavaDurationConversion
         ))
-        context.appendAnnotationIntrospector(KotlinNamesAnnotationIntrospector(cache, kotlinPropertyNameAsImplicitName))
+        context.appendAnnotationIntrospector(
+            KotlinNamesAnnotationIntrospector(cache, newStrictNullChecks, kotlinPropertyNameAsImplicitName)
+        )
 
         context.addDeserializers(KotlinDeserializers(cache, useJavaDurationConversion))
         context.addKeyDeserializers(KotlinKeyDeserializers)

src/main/kotlin/com/fasterxml/jackson/module/kotlin/KotlinNamesAnnotationIntrospector.kt

@@ -1,6 +1,8 @@
 package com.fasterxml.jackson.module.kotlin
 
 import com.fasterxml.jackson.annotation.JsonProperty
+import com.fasterxml.jackson.annotation.JsonSetter
+import com.fasterxml.jackson.annotation.Nulls
 import com.fasterxml.jackson.databind.JavaType
 import com.fasterxml.jackson.databind.cfg.MapperConfig
 import com.fasterxml.jackson.databind.introspect.Annotated
@@ -12,8 +14,10 @@ import com.fasterxml.jackson.databind.introspect.NopAnnotationIntrospector
 import com.fasterxml.jackson.databind.introspect.PotentialCreator
 import java.lang.reflect.Constructor
 import java.util.Locale
+import kotlin.collections.getOrNull
 import kotlin.reflect.KClass
 import kotlin.reflect.KFunction
+import kotlin.reflect.KParameter
 import kotlin.reflect.full.hasAnnotation
 import kotlin.reflect.full.memberProperties
 import kotlin.reflect.full.primaryConstructor
@@ -22,6 +26,7 @@ import kotlin.reflect.jvm.javaType
 
 internal class KotlinNamesAnnotationIntrospector(
     private val cache: ReflectionCache,
+    private val strictNullChecks: Boolean,
     private val kotlinPropertyNameAsImplicitName: Boolean
 ) : NopAnnotationIntrospector() {
     private fun getterNameFromJava(member: AnnotatedMethod): String? {
@@ -81,6 +86,18 @@ internal class KotlinNamesAnnotationIntrospector(
                 ?.let { config.constructType(it) }
         } ?: baseType
 
+    override fun findSetterInfo(ann: Annotated): JsonSetter.Value = ann.takeIf { strictNullChecks }
+        ?.let { _ ->
+            findKotlinParameter(ann)?.let { param ->
+                if (param.requireStrictNullCheck(ann.type)) {
+                    JsonSetter.Value.forContentNulls(Nulls.FAIL)
+                } else {
+                    null
+                }
+            }
+        }
+        ?: super.findSetterInfo(ann)
+
     override fun findDefaultCreator(
         config: MapperConfig<*>,
         valueClass: AnnotatedClass,
@@ -109,6 +126,13 @@ internal class KotlinNamesAnnotationIntrospector(
         ?.let { cache.findKotlinParameter(it) }
 }
 
+private fun KParameter.markedNonNullAt(index: Int) = type.arguments.getOrNull(index)?.type?.isMarkedNullable == false
+
+private fun KParameter.requireStrictNullCheck(type: JavaType): Boolean =
+    ((type.isArrayType || type.isCollectionLikeType) && this.markedNonNullAt(0)) ||
+            (type.isMapLikeType && this.markedNonNullAt(1))
+
+
 // If it is not a Kotlin class or an Enum, Creator is not used
 private fun AnnotatedClass.creatableKotlinClass(): KClass<*>? = annotated
     .takeIf { it.isKotlinClass() && !it.isEnum }