I have converting my application from RichFaces 3.3.3 to RichFaces 4. My application was using SerializableDataModel, which isn't present in RichFaces 4.0 (or at least, I couldn't find it). What should I use instead?
Yup, support for SerializableDataModel has been removed from RF 4. You can implement the same by using view or page scope to store the model between requests.