Fix tests

pkgs/jni/lib/src/lang/jcharacter.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2024, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
 import 'package:meta/meta.dart' show internal;
 
 import '../jobject.dart';

pkgs/jni/lib/src/util/jlist.dart

@@ -45,7 +45,9 @@ final class JListType<$E extends JObject> extends JObjType<JList<$E>> {
 
   @override
   bool operator ==(Object other) {
-    return other.runtimeType == JListType && other is JListType && E == other.E;
+    return other.runtimeType == (JListType<$E>) &&
+        other is JListType<$E> &&
+        E == other.E;
   }
 }
 

pkgs/jnigen/example/pdfbox_plugin/example/lib/main.dart

@@ -158,7 +158,7 @@ class PDFFileInfo {
   /// Converts JString to dart string and deletes the original.
   /// Also handles the case where the underlying string is Null.
   String _fromJavaStr(JString jstr) {
-    if (jstr.reference.pointer == nullptr) {
+    if (jstr.isNull) {
       return '(null)';
     }
     return jstr.toDartString(releaseOriginal: true);