src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/parser/JSONParser.java

@@ -248,18 +248,14 @@
         final PropertyMap newMap;
         final Class<?> type = ObjectClassGenerator.OBJECT_FIELDS_ONLY ? Object.class : getType(value);
 
         if (oldProperty != null) {
             values.set(oldProperty.getSlot(), value);
-            newProperty = new SpillProperty(id, 0, oldProperty.getSlot());
-            newProperty.setType(type);
-            newMap = propertyMap.replaceProperty(oldProperty, newProperty);;
+            newMap = propertyMap.replaceProperty(oldProperty, new SpillProperty(id, 0, oldProperty.getSlot(), type));;
         } else {
             values.add(value);
-            newProperty = new SpillProperty(id, 0, propertyMap.size());
-            newProperty.setType(type);
-            newMap = propertyMap.addProperty(newProperty);
+            newMap = propertyMap.addProperty(new SpillProperty(id, 0, propertyMap.size(), type));
         }
 
         return newMap;
     }