This project implemented:

• Rest API that can handle any structured data in Json
• Rest API with support for crud operations, including merge support, cascaded delete
• Rest API with support for validation
• Json Schema describing the data model for the use case
• Advanced semantics with rest API operations such as get if not changed
• Storage of data in key/value store

Have tried to apply Spring Boot Filter, but couldn't be able to find out why it filtered out all urls (not only /plans/*, but /auth). So had to verify token for each controller instead. In the 1st version, I used recursion to deal with nested objects.