diff --git a/src/java.base/share/classes/jdk/internal/reflect/AccessorUtils.java b/src/java.base/share/classes/jdk/internal/reflect/AccessorUtils.java
index 64b928e05e056..ec32da34c359b 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/AccessorUtils.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/AccessorUtils.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -31,7 +31,7 @@
 /**
  * Utility methods used by DirectMethodHandleAccessor and DirectConstructorHandleAccessor
  */
-public class AccessorUtils {
+public final class AccessorUtils {
     /**
      * Determines if the given exception thrown by MethodHandle::invokeExact
      * is caused by an illegal argument passed to Method::invoke or
diff --git a/src/java.base/share/classes/jdk/internal/reflect/ConstantPool.java b/src/java.base/share/classes/jdk/internal/reflect/ConstantPool.java
index a43034126e44e..a3cdcf569ca11 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/ConstantPool.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/ConstantPool.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -32,7 +32,7 @@
     Currently this is needed to provide reflective access to annotations
     but may be used by other internal subsystems in the future. */
 
-public class ConstantPool {
+public final class ConstantPool {
   // Number of entries in this constant pool (= maximum valid constant pool index)
   public int      getSize()                      { return getSize0            (constantPoolOop);        }
   public Class<?> getClassAt         (int index) { return getClassAt0         (constantPoolOop, index); }
diff --git a/src/java.base/share/classes/jdk/internal/reflect/ConstructorAccessor.java b/src/java.base/share/classes/jdk/internal/reflect/ConstructorAccessor.java
index 30d8baf634cc9..16b06580f1344 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/ConstructorAccessor.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/ConstructorAccessor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -32,7 +32,7 @@
     configured with a (possibly dynamically-generated) class which
     implements this interface. */
 
-public interface ConstructorAccessor {
+public sealed interface ConstructorAccessor permits ConstructorAccessorImpl {
     /** Matches specification in {@link java.lang.reflect.Constructor} */
     public Object newInstance(Object[] args)
         throws InstantiationException,
diff --git a/src/java.base/share/classes/jdk/internal/reflect/ConstructorAccessorImpl.java b/src/java.base/share/classes/jdk/internal/reflect/ConstructorAccessorImpl.java
index 13f6804b810c8..9aeacfc00c1f8 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/ConstructorAccessorImpl.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/ConstructorAccessorImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -27,7 +27,8 @@
 
 import java.lang.reflect.InvocationTargetException;
 
-abstract class ConstructorAccessorImpl implements ConstructorAccessor {
+abstract sealed class ConstructorAccessorImpl implements ConstructorAccessor
+        permits DirectConstructorHandleAccessor, DirectConstructorHandleAccessor.NativeAccessor, InstantiationExceptionConstructorAccessorImpl {
     /** Matches specification in {@link java.lang.reflect.Constructor} */
     public abstract Object newInstance(Object[] args)
         throws InstantiationException,
diff --git a/src/java.base/share/classes/jdk/internal/reflect/CsMethodAccessorAdapter.java b/src/java.base/share/classes/jdk/internal/reflect/CsMethodAccessorAdapter.java
index a2cfae6e97507..018436744d25e 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/CsMethodAccessorAdapter.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/CsMethodAccessorAdapter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -41,7 +41,7 @@
  * the adapter method with the caller class parameter will be called
  * instead.
  */
-class CsMethodAccessorAdapter extends MethodAccessorImpl {
+final class CsMethodAccessorAdapter extends MethodAccessorImpl {
     private final Method csmAdapter;
     private final MethodAccessor accessor;
 
diff --git a/src/java.base/share/classes/jdk/internal/reflect/DirectConstructorHandleAccessor.java b/src/java.base/share/classes/jdk/internal/reflect/DirectConstructorHandleAccessor.java
index 03a327b9e2cff..22e453c35dd37 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/DirectConstructorHandleAccessor.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/DirectConstructorHandleAccessor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -35,7 +35,7 @@
 
 import static jdk.internal.reflect.MethodHandleAccessorFactory.SPECIALIZED_PARAM_COUNT;
 
-class DirectConstructorHandleAccessor extends ConstructorAccessorImpl {
+final class DirectConstructorHandleAccessor extends ConstructorAccessorImpl {
     static ConstructorAccessorImpl constructorAccessor(Constructor<?> ctor, MethodHandle target) {
         return new DirectConstructorHandleAccessor(ctor, target);
     }
@@ -94,7 +94,7 @@ Object invokeImpl(Object[] args) throws Throwable {
     /**
      * Invoke the constructor via native VM reflection
      */
-    static class NativeAccessor extends ConstructorAccessorImpl {
+    static final class NativeAccessor extends ConstructorAccessorImpl {
         private final Constructor<?> ctor;
         NativeAccessor(Constructor<?> ctor) {
             this.ctor = ctor;
diff --git a/src/java.base/share/classes/jdk/internal/reflect/DirectMethodHandleAccessor.java b/src/java.base/share/classes/jdk/internal/reflect/DirectMethodHandleAccessor.java
index e6c5aa5db2edd..5133185dbcb85 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/DirectMethodHandleAccessor.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/DirectMethodHandleAccessor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -42,7 +42,7 @@
 import static java.lang.invoke.MethodType.genericMethodType;
 import static jdk.internal.reflect.MethodHandleAccessorFactory.LazyStaticHolder.JLIA;
 
-class DirectMethodHandleAccessor extends MethodAccessorImpl {
+final class DirectMethodHandleAccessor extends MethodAccessorImpl {
     /**
      * Creates a MethodAccessorImpl for a non-native method.
      */
@@ -203,7 +203,7 @@ private void checkReceiver(Object o) {
     /**
      * Invoke the method via native VM reflection
      */
-    static class NativeAccessor extends MethodAccessorImpl {
+    static final class NativeAccessor extends MethodAccessorImpl {
         private final Method method;
         private final Method csmAdapter;
         private final boolean callerSensitive;
diff --git a/src/java.base/share/classes/jdk/internal/reflect/FieldAccessor.java b/src/java.base/share/classes/jdk/internal/reflect/FieldAccessor.java
index 0df292afa60cd..ea5786fc04767 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/FieldAccessor.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/FieldAccessor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,7 +30,7 @@
     (possibly dynamically-generated) class which implements this
     interface. */
 
-public interface FieldAccessor {
+public sealed interface FieldAccessor permits FieldAccessorImpl {
     /** Matches specification in {@link java.lang.reflect.Field} */
     public Object get(Object obj) throws IllegalArgumentException;
 
diff --git a/src/java.base/share/classes/jdk/internal/reflect/FieldAccessorImpl.java b/src/java.base/share/classes/jdk/internal/reflect/FieldAccessorImpl.java
index 303924a25d853..81a2186fa84b5 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/FieldAccessorImpl.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/FieldAccessorImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -28,7 +28,7 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 
-abstract class FieldAccessorImpl implements FieldAccessor {
+abstract sealed class FieldAccessorImpl implements FieldAccessor permits MethodHandleFieldAccessorImpl {
     protected final Field field;
 
     FieldAccessorImpl(Field field) {
diff --git a/src/java.base/share/classes/jdk/internal/reflect/InstantiationExceptionConstructorAccessorImpl.java b/src/java.base/share/classes/jdk/internal/reflect/InstantiationExceptionConstructorAccessorImpl.java
index 7ec7dd32f761b..244d539885f41 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/InstantiationExceptionConstructorAccessorImpl.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/InstantiationExceptionConstructorAccessorImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -31,7 +31,7 @@
 /** Throws an InstantiationException with given error message upon
     newInstance() call */
 
-class InstantiationExceptionConstructorAccessorImpl
+final class InstantiationExceptionConstructorAccessorImpl
     extends ConstructorAccessorImpl {
     private final String message;
 
diff --git a/src/java.base/share/classes/jdk/internal/reflect/MethodAccessor.java b/src/java.base/share/classes/jdk/internal/reflect/MethodAccessor.java
index 27dfe4452e48f..28d2e8f3c9ad7 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/MethodAccessor.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/MethodAccessor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -33,7 +33,7 @@ configured with a (possibly dynamically-generated) class which
     implements this interface.
 */
 
-public interface MethodAccessor {
+public sealed interface MethodAccessor permits MethodAccessorImpl {
     /** Matches specification in {@link java.lang.reflect.Method} */
     public Object invoke(Object obj, Object[] args)
         throws IllegalArgumentException, InvocationTargetException;
diff --git a/src/java.base/share/classes/jdk/internal/reflect/MethodAccessorImpl.java b/src/java.base/share/classes/jdk/internal/reflect/MethodAccessorImpl.java
index adc4e1e268af5..560042f94a107 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/MethodAccessorImpl.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/MethodAccessorImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -36,7 +36,8 @@
     methods for java.lang.reflect.Method.invoke(). </P>
 */
 
-abstract class MethodAccessorImpl implements MethodAccessor {
+abstract sealed class MethodAccessorImpl implements MethodAccessor
+        permits DirectMethodHandleAccessor, DirectMethodHandleAccessor.NativeAccessor, CsMethodAccessorAdapter {
     /** Matches specification in {@link java.lang.reflect.Method} */
     public abstract Object invoke(Object obj, Object[] args)
         throws IllegalArgumentException, InvocationTargetException;
diff --git a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleAccessorFactory.java b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleAccessorFactory.java
index 93a208662d572..77c0ed7f3a001 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleAccessorFactory.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleAccessorFactory.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -438,7 +438,7 @@ public static boolean isSignaturePolymorphicMethod(Method method) {
     /*
      * Delay initializing these static fields until java.lang.invoke is fully initialized.
      */
-    static class LazyStaticHolder {
+    static final class LazyStaticHolder {
         static final JavaLangInvokeAccess JLIA = SharedSecrets.getJavaLangInvokeAccess();
     }
 
diff --git a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleBooleanFieldAccessorImpl.java b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleBooleanFieldAccessorImpl.java
index 2e0609264bd2d..1b8335cfbad88 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleBooleanFieldAccessorImpl.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleBooleanFieldAccessorImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,7 +30,7 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 
-class MethodHandleBooleanFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
+final class MethodHandleBooleanFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
     static FieldAccessorImpl fieldAccessor(Field field, MethodHandle getter, MethodHandle setter, boolean isReadOnly) {
         boolean isStatic = Modifier.isStatic(field.getModifiers());
         if (isStatic) {
diff --git a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleByteFieldAccessorImpl.java b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleByteFieldAccessorImpl.java
index b56fbbcbcb28e..242a731b4610b 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleByteFieldAccessorImpl.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleByteFieldAccessorImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,7 +30,7 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 
-class MethodHandleByteFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
+final class MethodHandleByteFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
     static FieldAccessorImpl fieldAccessor(Field field, MethodHandle getter, MethodHandle setter, boolean isReadOnly) {
         boolean isStatic = Modifier.isStatic(field.getModifiers());
         if (isStatic) {
diff --git a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleCharacterFieldAccessorImpl.java b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleCharacterFieldAccessorImpl.java
index c1f357326f4e2..424914a8a92cd 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleCharacterFieldAccessorImpl.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleCharacterFieldAccessorImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,7 +30,7 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 
-class MethodHandleCharacterFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
+final class MethodHandleCharacterFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
     static FieldAccessorImpl fieldAccessor(Field field, MethodHandle getter, MethodHandle setter, boolean isReadOnly) {
         boolean isStatic = Modifier.isStatic(field.getModifiers());
         if (isStatic) {
diff --git a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleDoubleFieldAccessorImpl.java b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleDoubleFieldAccessorImpl.java
index 01652951e4272..6408a03f3ce58 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleDoubleFieldAccessorImpl.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleDoubleFieldAccessorImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,7 +30,7 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 
-class MethodHandleDoubleFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
+final class MethodHandleDoubleFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
     static FieldAccessorImpl fieldAccessor(Field field, MethodHandle getter, MethodHandle setter, boolean isReadOnly) {
         boolean isStatic = Modifier.isStatic(field.getModifiers());
         if (isStatic) {
diff --git a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleFieldAccessorImpl.java b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleFieldAccessorImpl.java
index f979d38f9ab73..4b56378e04bca 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleFieldAccessorImpl.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleFieldAccessorImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -29,7 +29,16 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 
-abstract class MethodHandleFieldAccessorImpl extends FieldAccessorImpl {
+abstract sealed class MethodHandleFieldAccessorImpl extends FieldAccessorImpl
+        permits MethodHandleBooleanFieldAccessorImpl,
+                MethodHandleCharacterFieldAccessorImpl,
+                MethodHandleByteFieldAccessorImpl,
+                MethodHandleShortFieldAccessorImpl,
+                MethodHandleIntegerFieldAccessorImpl,
+                MethodHandleLongFieldAccessorImpl,
+                MethodHandleFloatFieldAccessorImpl,
+                MethodHandleDoubleFieldAccessorImpl,
+                MethodHandleObjectFieldAccessorImpl {
     private static final int IS_READ_ONLY_BIT = 0x0001;
     private static final int IS_STATIC_BIT = 0x0002;
     private static final int NONZERO_BIT = 0x8000;
diff --git a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleFloatFieldAccessorImpl.java b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleFloatFieldAccessorImpl.java
index 5ac00ec5ea8e8..e8e59b159167d 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleFloatFieldAccessorImpl.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleFloatFieldAccessorImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,7 +30,7 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 
-class MethodHandleFloatFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
+final class MethodHandleFloatFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
     static FieldAccessorImpl fieldAccessor(Field field, MethodHandle getter, MethodHandle setter, boolean isReadOnly) {
         boolean isStatic = Modifier.isStatic(field.getModifiers());
         if (isStatic) {
diff --git a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleIntegerFieldAccessorImpl.java b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleIntegerFieldAccessorImpl.java
index 62e3ab083dbdc..220147d374e7e 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleIntegerFieldAccessorImpl.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleIntegerFieldAccessorImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,7 +30,7 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 
-class MethodHandleIntegerFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
+final class MethodHandleIntegerFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
     static FieldAccessorImpl fieldAccessor(Field field, MethodHandle getter, MethodHandle setter, boolean isReadOnly) {
         boolean isStatic = Modifier.isStatic(field.getModifiers());
         if (isStatic) {
diff --git a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleLongFieldAccessorImpl.java b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleLongFieldAccessorImpl.java
index a0e02204b3101..29efadbff371e 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleLongFieldAccessorImpl.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleLongFieldAccessorImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,7 +30,7 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 
-class MethodHandleLongFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
+final class MethodHandleLongFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
     static FieldAccessorImpl fieldAccessor(Field field, MethodHandle getter, MethodHandle setter, boolean isReadOnly) {
         boolean isStatic = Modifier.isStatic(field.getModifiers());
         if (isStatic) {
diff --git a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleObjectFieldAccessorImpl.java b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleObjectFieldAccessorImpl.java
index 722d73d22a6ad..afbe41e8fe92f 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleObjectFieldAccessorImpl.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleObjectFieldAccessorImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,7 +30,7 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 
-class MethodHandleObjectFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
+final class MethodHandleObjectFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
     static FieldAccessorImpl fieldAccessor(Field field, MethodHandle getter, MethodHandle setter, boolean isReadOnly) {
         boolean isStatic = Modifier.isStatic(field.getModifiers());
         if (isStatic) {
diff --git a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleShortFieldAccessorImpl.java b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleShortFieldAccessorImpl.java
index 265c555421a3e..711c372d2bfd1 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/MethodHandleShortFieldAccessorImpl.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/MethodHandleShortFieldAccessorImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,7 +30,7 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 
-class MethodHandleShortFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
+final class MethodHandleShortFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
     static FieldAccessorImpl fieldAccessor(Field field, MethodHandle getter, MethodHandle setter, boolean isReadOnly) {
         boolean isStatic = Modifier.isStatic(field.getModifiers());
         if (isStatic) {
diff --git a/src/java.base/share/classes/jdk/internal/reflect/Reflection.java b/src/java.base/share/classes/jdk/internal/reflect/Reflection.java
index 5025b81dd10ed..912b712f9b38e 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/Reflection.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/Reflection.java
@@ -41,7 +41,7 @@
 /** Common utility routines used by both java.lang and
     java.lang.reflect */
 
-public class Reflection {
+public final class Reflection {
 
     /** Used to filter out fields and methods from certain classes from public
         view, where they are sensitive or they may contain VM-internal objects.
diff --git a/src/java.base/share/classes/jdk/internal/reflect/ReflectionFactory.java b/src/java.base/share/classes/jdk/internal/reflect/ReflectionFactory.java
index 20b390855c908..36d3e6d3a2f5a 100644
--- a/src/java.base/share/classes/jdk/internal/reflect/ReflectionFactory.java
+++ b/src/java.base/share/classes/jdk/internal/reflect/ReflectionFactory.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -60,7 +60,7 @@
     {@link jdk.internal.misc.Unsafe}. </P>
 */
 
-public class ReflectionFactory {
+public final class ReflectionFactory {
 
     private static final ReflectionFactory soleInstance = new ReflectionFactory();
 
diff --git a/test/hotspot/jtreg/runtime/classFileParserBug/FakeMethodAcc.java b/test/hotspot/jtreg/runtime/classFileParserBug/FakeMethodAcc.java
index ba8304319b5a7..1825f1c1d5b18 100644
--- a/test/hotspot/jtreg/runtime/classFileParserBug/FakeMethodAcc.java
+++ b/test/hotspot/jtreg/runtime/classFileParserBug/FakeMethodAcc.java
@@ -31,7 +31,7 @@
 
 /*
  * Test that trying to create a sub-type of a 'magic' jdk.internal.reflect
- * class should fail with an IllegalAccessError exception.
+ * class should fail with an IncompatibleClassChangeError exception.
 */
 public class FakeMethodAcc {
     public static void main(String args[]) throws Throwable {
@@ -40,8 +40,8 @@ public static void main(String args[]) throws Throwable {
         try {
             Class newClass = Class.forName("fakeMethodAccessor");
             throw new RuntimeException(
-                "Missing expected IllegalAccessError exception");
-        } catch (java.lang.IllegalAccessError e) {
+                "Missing expected IncompatibleClassChangeError exception");
+        } catch (java.lang.IncompatibleClassChangeError e) {
         }
     }
 }