RowAdapter throws an undocumented, unchecked exception if an identifier passed to get() does not exist as a row in the returned query.

This pattern is not ideal, and instead should simply return null, thereby allowing clients to easily skip non-existent objects much more cleanly and more lightweight than exception handling.

Additionally, the ViewChangedEventListener interface does not provide a way to know which query was invoked for the callback. It is cumbersome to create per-query ViewChangedEventListener objects which allows you to avoid querying identifiers that you know exist in the query result callback.