8266459: Implement JEP 411: Deprecate the Security Manager for Removal

Co-authored-by: Sean Mullan <mullan@openjdk.org>
Co-authored-by: Lance Andersen <lancea@openjdk.org>
Co-authored-by: Weijun Wang <weijun@openjdk.org>
Reviewed-by: erikj, darcy, chegar, naoto, joehw, alanb, mchung, kcr, prr, lancea

src/java.base/share/classes/java/nio/charset/Charset.java

@@ -375,6 +375,7 @@ public abstract class Charset
     private static ThreadLocal<ThreadLocal<?>> gate =
             new ThreadLocal<ThreadLocal<?>>();
 
+    @SuppressWarnings("removal")
     private static Charset lookupViaProviders(final String charsetName) {
 
         // The runtime startup sequence looks up standard charsets as a
@@ -417,6 +418,7 @@ public abstract class Charset
     private static class ExtendedProviderHolder {
         static final CharsetProvider[] extendedProviders = extendedProviders();
         // returns ExtendedProvider, if installed
+        @SuppressWarnings("removal")
         private static CharsetProvider[] extendedProviders() {
             return AccessController.doPrivileged(new PrivilegedAction<>() {
                     public CharsetProvider[] run() {
@@ -563,6 +565,7 @@ public abstract class Charset
      * @return An immutable, case-insensitive map from canonical charset names
      *         to charset objects
      */
+    @SuppressWarnings("removal")
     public static SortedMap<String,Charset> availableCharsets() {
         return AccessController.doPrivileged(
             new PrivilegedAction<>() {

src/java.base/share/classes/java/nio/charset/spi/CharsetProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2021, 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
@@ -71,6 +71,7 @@ import java.util.Iterator;
 public abstract class CharsetProvider {
 
     private static Void checkPermission() {
+        @SuppressWarnings("removal")
         SecurityManager sm = System.getSecurityManager();
         if (sm != null)
             sm.checkPermission(new RuntimePermission("charsetProvider"));