Register Kotlin's empty list and map for reflection

Fixes: #44472

Author: geoand

extensions/kotlin/deployment/src/main/java/io/quarkus/kotlin/deployment/KotlinProcessor.java

@@ -61,6 +61,8 @@ void registerKotlinReflection(final BuildProducer<ReflectiveClassBuildItem> refl
                 .build());
         reflectiveClass.produce(ReflectiveClassBuildItem.builder("kotlin.KotlinVersion$Companion[]").constructors(false)
                 .build());
+        reflectiveClass.produce(
+                ReflectiveClassBuildItem.builder("kotlin.collections.EmptyList", "kotlin.collections.EmptyMap").build());
 
         nativeResourcePatterns.produce(builder().includePatterns(
                 "META-INF/.*.kotlin_module$",

integration-tests/kotlin-serialization/src/main/kotlin/io/quarkus/it/kotser/GreetingResource.kt

@@ -73,5 +73,17 @@ class GreetingResource {
         return Response.ok().entity(javaMethod.invoke(this)).build()
     }
 
+    @GET
+    @Path("emptyList")
+    fun emptyList(): List<String> {
+        return emptyList<String>()
+    }
+
+    @GET
+    @Path("emptyMap")
+    fun emptyMap(): Map<String, String> {
+        return emptyMap<String, String>()
+    }
+
     fun reflect() = "hello, world"
 }

integration-tests/kotlin-serialization/src/test/kotlin/io/quarkus/it/kotser/ResourceTest.kt

@@ -124,4 +124,14 @@ open class ResourceTest {
                 body(CoreMatchers.equalTo("hello, world"))
             }
     }
+
+    @Test
+    fun testEmptyList() {
+        When { get("/emptyList") } Then { statusCode(200) }
+    }
+
+    @Test
+    fun testEmptyMap() {
+        When { get("/emptyList") } Then { statusCode(200) }
+    }
 }