Updated TODOs to reflect insights about the Java 18+ problem.

TODO.md

@@ -1,7 +1,9 @@
 # 1.8.2
 
-    - Make run with Java 21 (22?).
+    - Make run with Java 18+.
       See https://github.com/jqwik-team/jqwik/issues/528.
+      This may require a change to how methods are invoked via reflection.
+      See JqwikReflectionSupport.invokeMethodPotentiallyOuter() will probably need to accept the current property context as parameter.
 
     - Can large array shrinking be improved?
       See https://github.com/jqwik-team/jqwik/issues/525 

engine/src/main/java/net/jqwik/engine/support/JqwikReflectionSupport.java

@@ -14,8 +14,6 @@
 import net.jqwik.api.*;
 import net.jqwik.api.providers.*;
 import net.jqwik.api.support.*;
-import net.jqwik.engine.properties.shrinking.*;
-import net.jqwik.engine.support.types.*;
 
 import static java.util.stream.Collectors.*;
 
@@ -47,7 +45,7 @@ private static Optional<Object> getOuterInstance(Object inner) {
 		// but has been stable so far in all JDKs
 
 		return Arrays
-				   .stream(getDeclaredFields(inner))
+				   .stream(inner.getClass().getDeclaredFields())
 				   .filter(field -> field.getName().startsWith("this$"))
 				   .findFirst()
 				   .map(field -> {
@@ -62,11 +60,6 @@ private static Optional<Object> getOuterInstance(Object inner) {
 				   });
 	}
 
-	// Public for testing purposes only
-	public static Field[] getDeclaredFields(Object any) {
-		return any.getClass().getDeclaredFields();
-	}
-
 	@SuppressWarnings("deprecation") // Deprecated as of Java 9
 	private static <T extends AccessibleObject> T makeAccessible(T object) {
 		if (!object.isAccessible()) {
@@ -169,7 +162,7 @@ public static List<Field> findFieldsPotentiallyOuter(
 
 	public static Object readFieldPotentiallyOuter(Field field, Object target) {
 		makeAccessible(field);
-		List<Field> declaredFields = Arrays.stream(getDeclaredFields(target)).collect(toList());
+		List<Field> declaredFields = Arrays.stream(target.getClass().getDeclaredFields()).collect(toList());
 		if (declaredFields.contains(field)) {
 			try {
 				return field.get(target);
@@ -189,7 +182,7 @@ public static Object readFieldPotentiallyOuter(Field field, Object target) {
 
 	public static void setFieldPotentiallyOuter(Field field, Object value, Object target) {
 		makeAccessible(field);
-		List<Field> declaredFields = Arrays.stream(getDeclaredFields(target)).collect(toList());
+		List<Field> declaredFields = Arrays.stream(target.getClass().getDeclaredFields()).collect(toList());
 		if (declaredFields.contains(field)) {
 			try {
 				if (isStatic(field)) {