Copilot commented on code in PR #15947:
URL: https://github.com/apache/grails-core/pull/15947#discussion_r3553740028


##########
grails-web-databinding/src/main/groovy/grails/web/databinding/DataBindingUtils.java:
##########
@@ -119,13 +120,19 @@ public static BindingResult bindObjectToInstance(Object 
object, Object source) {
     }
 
     protected static List getBindingIncludeList(final Object object) {
-        List includeList = Collections.emptyList();
+        final boolean legacyBindableDefaultEnabled = 
isLegacyBindableDefaultEnabled();
+        final String whiteListFieldName = legacyBindableDefaultEnabled ?
+                DefaultASTDatabindingHelper.LEGACY_DATABINDING_WHITELIST :
+                DefaultASTDatabindingHelper.DEFAULT_DATABINDING_WHITELIST;
+        final Map<Class, List> includeListCache = legacyBindableDefaultEnabled 
?
+                CLASS_TO_LEGACY_BINDING_INCLUDE_LIST : 
CLASS_TO_BINDING_INCLUDE_LIST;
+        List includeList = legacyBindableDefaultEnabled ? 
Collections.emptyList() : 
Collections.singletonList(DefaultASTDatabindingHelper.NO_BINDABLE_PROPERTIES);
         try {
             final Class<? extends Object> objectClass = object.getClass();
-            if (CLASS_TO_BINDING_INCLUDE_LIST.containsKey(objectClass)) {
-                includeList = CLASS_TO_BINDING_INCLUDE_LIST.get(objectClass);
+            if (includeListCache.containsKey(objectClass)) {
+                includeList = includeListCache.get(objectClass);
             } else {
-                final Field whiteListField = 
objectClass.getDeclaredField(DefaultASTDatabindingHelper.DEFAULT_DATABINDING_WHITELIST);
+                final Field whiteListField = 
objectClass.getDeclaredField(whiteListFieldName);

Review Comment:
   `getBindingIncludeList` uses `Class.getDeclaredField(...)` to read the 
injected whitelist field. Since the whitelist field is added as a **public 
static** field, this lookup will fail for subclasses (for example 
Hibernate/CGLIB/ByteBuddy proxy subclasses of a domain/command class). With the 
new deny-by-default behavior, that failure will fall back to 
`NO_BINDABLE_PROPERTIES` and bind nothing even though the superclass has the 
generated allowlist.
   
   Using `getField(...)` (or walking the superclass chain) will correctly 
resolve inherited public static whitelist fields and preserve binding for 
proxied instances.



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