fix generics

Author: k163377

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

@@ -62,7 +62,7 @@ internal class KotlinAnnotationIntrospector(private val context: Module.SetupCon
     }
 
     // Find a serializer to handle the case where the getter returns an unboxed value from the value class.
-    override fun findSerializer(am: Annotated): ValueClassBoxSerializer? = when (am) {
+    override fun findSerializer(am: Annotated): ValueClassBoxSerializer<*>? = when (am) {
         is AnnotatedMethod -> {
             val getter = am.member.apply {
                 // If the return value of the getter is a value class,
@@ -85,9 +85,10 @@ internal class KotlinAnnotationIntrospector(private val context: Module.SetupCon
 
             (kotlinProperty?.returnType?.classifier as? KClass<*>)
                 ?.takeIf { it.isValue }
+                ?.java
                 ?.let { outerClazz ->
                     @Suppress("UNCHECKED_CAST")
-                    ValueClassBoxSerializer(outerClazz as KClass<Any>, getter.returnType)
+                    ValueClassBoxSerializer(outerClazz, getter.returnType)
                 }
         }
         // Ignore the case of AnnotatedField, because JvmField cannot be set in the field of value class.

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

@@ -77,15 +77,15 @@ internal class KotlinSerializers : Serializers.Base() {
 // The getter generated for the value class is special,
 // so this class will not work properly when added to the Serializers
 // (it is configured from KotlinAnnotationIntrospector.findSerializer).
-internal class ValueClassBoxSerializer(
-    outerClazz: KClass<Any>, innerClazz: Class<*>
-) : StdSerializer<Any>(outerClazz.java) {
-    private val boxMethod = _handledType.getMethod("box-impl", innerClazz)
+internal class ValueClassBoxSerializer<T : Any>(
+    private val outerClazz: Class<out Any>, innerClazz: Class<T>
+) : StdSerializer<T>(innerClazz) {
+    private val boxMethod = outerClazz.getMethod("box-impl", innerClazz)
 
-    override fun serialize(value: Any?, gen: JsonGenerator, provider: SerializerProvider) {
+    override fun serialize(value: T?, gen: JsonGenerator, provider: SerializerProvider) {
         // Values retrieved from getter are considered validated and constructor-impl is not executed.
         val boxed = boxMethod.invoke(null, value)
 
-        provider.findValueSerializer(_handledType).serialize(boxed, gen, provider)
+        provider.findValueSerializer(outerClazz).serialize(boxed, gen, provider)
     }
 }