Class generatedClass = generateMapEntryClassAndDescriptor(property, descriptor.getNonNullNamespaceResolver());
mapping.setReferenceClass(generatedClass);
String mapClassName = property.getType().getRawName();
mapping.useCollectionClass(ArrayList.class);
mapping.setAttributeAccessor(new MapValueAttributeAccessor(mapping.getAttributeAccessor(), mapping.getContainerPolicy(), generatedClass, mapClassName, helper.getClassLoader()));
return mapping;
}