Add val KClass.staticProperties: Collection<KProperty0<*>>

To get static fields from Java classes

core/reflection.jvm/src/kotlin/reflect/KClassExtensions.kt

@@ -114,6 +114,16 @@ public val KClass<*>.declaredMemberExtensionFunctions: Collection<KFunction<*>>
             .filterIsInstance<KFunction<*>>()
             .toList()
 
+/**
+ * Returns static properties declared in this class.
+ * Only properties representing static fields of Java classes are considered static.
+ */
+public val KClass<*>.staticProperties: Collection<KProperty0<*>>
+    get() = (this as KClassImpl)
+            .getMembers(staticScope, declaredOnly = false, nonExtensions = true, extensions = false)
+            .filterIsInstance<KProperty0<*>>()
+            .toList()
+
 /**
  * Returns non-extension properties declared in this class and all of its superclasses.
  */

core/reflection.jvm/src/kotlin/reflect/jvm/internal/RuntimeTypeMapper.kt

@@ -149,7 +149,8 @@ object RuntimeTypeMapper {
         }
     }
 
-    fun mapPropertySignature(property: PropertyDescriptor): JvmPropertySignature {
+    fun mapPropertySignature(possiblyOverriddenProperty: PropertyDescriptor): JvmPropertySignature {
+        val property = DescriptorUtils.unwrapFakeOverride(possiblyOverriddenProperty)
         if (property is DeserializedPropertyDescriptor) {
             val proto = property.proto
             if (!proto.hasExtension(JvmProtoBuf.propertySignature)) {