Merge branch '6.2.x'

spring-web/src/main/java/org/springframework/web/method/support/InvocableHandlerMethod.java

@@ -30,6 +30,8 @@ import kotlin.reflect.KType;
 import kotlin.reflect.full.KClasses;
 import kotlin.reflect.jvm.KCallablesJvm;
 import kotlin.reflect.jvm.ReflectJvmMapping;
+import reactor.core.publisher.Mono;
+import reactor.core.publisher.SynchronousSink;
 
 import org.springframework.context.MessageSource;
 import org.springframework.core.CoroutinesUtils;
@@ -288,7 +290,8 @@ public class InvocableHandlerMethod extends HandlerMethod {
 	 * @since 6.0
 	 */
 	protected Object invokeSuspendingFunction(Method method, Object target, Object[] args) {
-		return CoroutinesUtils.invokeSuspendingFunction(method, target, args);
+		Object result = CoroutinesUtils.invokeSuspendingFunction(method, target, args);
+		return (result instanceof Mono<?> mono ? mono.handle(KotlinDelegate::handleResult) : result);
 	}
 
 
@@ -298,7 +301,7 @@ public class InvocableHandlerMethod extends HandlerMethod {
 	private static class KotlinDelegate {
 
 		@Nullable
-		@SuppressWarnings({"deprecation", "DataFlowIssue"})
+		@SuppressWarnings("DataFlowIssue")
 		public static Object invokeFunction(Method method, Object target, Object[] args) throws InvocationTargetException, IllegalAccessException, NoSuchMethodException {
 			KFunction<?> function = ReflectJvmMapping.getKotlinFunction(method);
 			// For property accessors
@@ -333,10 +336,33 @@ public class InvocableHandlerMethod extends HandlerMethod {
 			}
 			Object result = function.callBy(argMap);
 			if (result != null && KotlinDetector.isInlineClass(result.getClass())) {
-				return result.getClass().getDeclaredMethod("unbox-impl").invoke(result);
+				result = unbox(result);
 			}
 			return (result == Unit.INSTANCE ? null : result);
 		}
+
+		private static void handleResult(Object result, SynchronousSink<Object> sink) {
+			if (KotlinDetector.isInlineClass(result.getClass())) {
+				try {
+					Object unboxed = unbox(result);
+					if (unboxed != Unit.INSTANCE) {
+						sink.next(unboxed);
+					}
+					sink.complete();
+				}
+				catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException ex) {
+					sink.error(ex);
+				}
+			}
+			else {
+				sink.next(result);
+				sink.complete();
+			}
+		}
+
+		private static Object unbox(Object result) throws InvocationTargetException, IllegalAccessException, NoSuchMethodException {
+			return result.getClass().getDeclaredMethod("unbox-impl").invoke(result);
+		}
 	}
 
 }