src/java.base/share/classes/java/lang/invoke/MethodHandles.java

@@ -2399,11 +2399,13 @@
                 if (!getField.getDeclaringClass().isAssignableFrom(lookupClass())) {
                     throw getField.makeAccessException("caller class must be a subclass below the method", lookupClass());
                 }
                 refc = lookupClass();
             }
-            return VarHandles.makeFieldHandle(getField, refc, getField.getFieldType(), this.allowedModes == TRUSTED);
+            // don't allow writing on value type
+            boolean isWriteAllowedOnFinalFields = this.allowedModes == TRUSTED && !putField.isValue();
+            return VarHandles.makeFieldHandle(getField, refc, getField.getFieldType(), isWriteAllowedOnFinalFields);
         }
         /** Check access and get the requested constructor. */
         private MethodHandle getDirectConstructor(Class<?> refc, MemberName ctor) throws IllegalAccessException {
             final boolean checkSecurity = true;
             return getDirectConstructorCommon(refc, ctor, checkSecurity);