Avoid nested constructor binding if there are no request parameters

Closes gh-31821

spring-context/src/main/java/org/springframework/validation/DataBinder.java

@@ -948,7 +948,7 @@ public class DataBinder implements PropertyEditorRegistry, TypeConverter {
 				Class<?> paramType = paramTypes[i];
 				Object value = valueResolver.resolveValue(paramPath, paramType);
 
-				if (value == null && shouldConstructArgument(param)) {
+				if (value == null && shouldConstructArgument(param) && hasValuesFor(paramPath, valueResolver)) {
 					ResolvableType type = ResolvableType.forMethodParameter(param);
 					args[i] = createObject(type, paramPath + ".", valueResolver);
 				}
@@ -1022,6 +1022,15 @@ public class DataBinder implements PropertyEditorRegistry, TypeConverter {
 				type.getPackageName().startsWith("java."));
 	}
 
+	private boolean hasValuesFor(String paramPath, ValueResolver resolver) {
+		for (String name : resolver.getNames()) {
+			if (name.startsWith(paramPath + ".")) {
+				return true;
+			}
+		}
+		return false;
+	}
+
 	private void validateConstructorArgument(
 			Class<?> constructorClass, String nestedPath, String name, @Nullable Object value) {
 
@@ -1293,7 +1302,6 @@ public class DataBinder implements PropertyEditorRegistry, TypeConverter {
 	 * Strategy for {@link #construct constructor binding} to look up the values
 	 * to bind to a given constructor parameter.
 	 */
-	@FunctionalInterface
 	public interface ValueResolver {
 
 		/**
@@ -1305,6 +1313,13 @@ public class DataBinder implements PropertyEditorRegistry, TypeConverter {
 		 */
 		@Nullable
 		Object resolveValue(String name, Class<?> type);
+
+		/**
+		 * Return the names of all property values.
+		 * @since 6.1.2
+		 */
+		Set<String> getNames();
+
 	}