Nitrite is a NoSQL embedded document store written in Java. The name is derived from NOsql Object (NO2 is the chemical notation of "nitrite"). It supports both in-memory and file-based storage using the H2 database.
https://www.dizitart.org/nitrite-database.html
https://github.com/dizitart/nitrite-database
https://www.dizitart.org/nitrite-database/
Anindya Chatterjee
2017