diff --git a/src/java.base/share/classes/java/lang/Byte.java b/src/java.base/share/classes/java/lang/Byte.java
index 74a42d98a43..18502abf69c 100644
--- a/src/java.base/share/classes/java/lang/Byte.java
+++ b/src/java.base/share/classes/java/lang/Byte.java
@@ -27,6 +27,7 @@ package java.lang;
 
 import jdk.internal.misc.CDS;
 import jdk.internal.vm.annotation.IntrinsicCandidate;
+import jdk.internal.vm.annotation.Stable;
 
 import java.lang.constant.Constable;
 import java.lang.constant.DynamicConstantDesc;
@@ -105,9 +106,10 @@ public final class Byte extends Number implements Comparable<Byte>, Constable {
         return Optional.of(DynamicConstantDesc.ofNamed(BSM_EXPLICIT_CAST, DEFAULT_NAME, CD_byte, intValue()));
     }
 
-    private static class ByteCache {
+    private static final class ByteCache {
         private ByteCache() {}
 
+        @Stable
         static final Byte[] cache;
         static Byte[] archivedCache;
 
diff --git a/src/java.base/share/classes/java/lang/Character.java b/src/java.base/share/classes/java/lang/Character.java
index 81548aae73d..d4399d2af6a 100644
--- a/src/java.base/share/classes/java/lang/Character.java
+++ b/src/java.base/share/classes/java/lang/Character.java
@@ -27,6 +27,7 @@ package java.lang;
 
 import jdk.internal.misc.CDS;
 import jdk.internal.vm.annotation.IntrinsicCandidate;
+import jdk.internal.vm.annotation.Stable;
 
 import java.lang.constant.Constable;
 import java.lang.constant.DynamicConstantDesc;
@@ -8956,9 +8957,10 @@ class Character implements java.io.Serializable, Comparable<Character>, Constabl
         this.value = value;
     }
 
-    private static class CharacterCache {
+    private static final class CharacterCache {
         private CharacterCache(){}
 
+        @Stable
         static final Character[] cache;
         static Character[] archivedCache;
 
diff --git a/src/java.base/share/classes/java/lang/Integer.java b/src/java.base/share/classes/java/lang/Integer.java
index 1e136cdde0c..8c8bcb9226f 100644
--- a/src/java.base/share/classes/java/lang/Integer.java
+++ b/src/java.base/share/classes/java/lang/Integer.java
@@ -29,6 +29,7 @@ import jdk.internal.misc.CDS;
 import jdk.internal.misc.VM;
 import jdk.internal.vm.annotation.ForceInline;
 import jdk.internal.vm.annotation.IntrinsicCandidate;
+import jdk.internal.vm.annotation.Stable;
 
 import java.lang.annotation.Native;
 import java.lang.constant.Constable;
@@ -1005,9 +1006,11 @@ public final class Integer extends Number
      * with new Integer object(s) after initialization.
      */
 
-    private static class IntegerCache {
+    private static final class IntegerCache {
         static final int low = -128;
         static final int high;
+
+        @Stable
         static final Integer[] cache;
         static Integer[] archivedCache;
 
diff --git a/src/java.base/share/classes/java/lang/Long.java b/src/java.base/share/classes/java/lang/Long.java
index 6db8f8a96c1..fb5e4cecca8 100644
--- a/src/java.base/share/classes/java/lang/Long.java
+++ b/src/java.base/share/classes/java/lang/Long.java
@@ -36,6 +36,7 @@ import java.util.Optional;
 import jdk.internal.misc.CDS;
 import jdk.internal.vm.annotation.ForceInline;
 import jdk.internal.vm.annotation.IntrinsicCandidate;
+import jdk.internal.vm.annotation.Stable;
 
 import static java.lang.String.COMPACT_STRINGS;
 import static java.lang.String.LATIN1;
@@ -1156,9 +1157,10 @@ public final class Long extends Number
         return Long.valueOf(parseLong(s, 10));
     }
 
-    private static class LongCache {
+    private static final class LongCache {
         private LongCache() {}
 
+        @Stable
         static final Long[] cache;
         static Long[] archivedCache;
 
diff --git a/src/java.base/share/classes/java/lang/Short.java b/src/java.base/share/classes/java/lang/Short.java
index fa93dcbccab..6a148d1edac 100644
--- a/src/java.base/share/classes/java/lang/Short.java
+++ b/src/java.base/share/classes/java/lang/Short.java
@@ -27,6 +27,7 @@ package java.lang;
 
 import jdk.internal.misc.CDS;
 import jdk.internal.vm.annotation.IntrinsicCandidate;
+import jdk.internal.vm.annotation.Stable;
 
 import java.lang.constant.Constable;
 import java.lang.constant.DynamicConstantDesc;
@@ -231,9 +232,10 @@ public final class Short extends Number implements Comparable<Short>, Constable
         return Optional.of(DynamicConstantDesc.ofNamed(BSM_EXPLICIT_CAST, DEFAULT_NAME, CD_short, intValue()));
     }
 
-    private static class ShortCache {
+    private static final class ShortCache {
         private ShortCache() {}
 
+        @Stable
         static final Short[] cache;
         static Short[] archivedCache;