openjdk · wenshao · Apr 26, 2025 · Apr 26, 2025
diff --git 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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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/...ase/share/classes/jdk/internal/reflect/InstantiationExceptionConstructorAccessorImpl.java b/...ase/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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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) {