Fix #4595: PropertyName.merge() not considering PropertyName.NO_NAME

Author: cowtowncoder

release-notes/VERSION-2.x

@@ -16,6 +16,8 @@ Project: jackson-databind
 #4577: Cannot deserialize value of type `java.math.BigDecimal` from
    String "3." (not a valid representation)
  (reported by @dmelisso)
+#4595: No way to explicitly disable wrapping in custom annotation processor
+ (reported by @SimonCockx)
 
 2.17.1 (04-May-2024)
 

src/main/java/com/fasterxml/jackson/databind/PropertyName.java

@@ -82,6 +82,9 @@ protected Object readResolve() {
                 return NO_NAME;
             }
             */
+            // 22-Jun-2024, tatu: This is hopeful not problematic as marker
+            //   value should only be provided by AnnotationIntrospector etc,
+            //   but not stored in Deserializer/Serializer instances.
         }
         return this;
     }
@@ -127,6 +130,10 @@ public static PropertyName merge(PropertyName name1, PropertyName name2) {
         if (name2 == null) {
             return name1;
         }
+        // 22-Jun-2024, tatu: [databind#4595] Should not merge NO_NAME
+        if (name1 == NO_NAME) {
+            return name1;
+        }
         String ns = _nonEmpty(name1._namespace, name2._namespace);
         String simple = _nonEmpty(name1._simpleName, name2._simpleName);