These are modules providing access to various data stores, including relational, document oriented, key/value stores, etc.
The jdbi module provides a fluent and lightweight SQL library for jdbc.
The jOOQ module lets you build type safe SQL queries through its fluent API.
Requery is a light but powerful object mapping and SQL generator for Java/Kotlin/Android with RxJava and Java 8 support. Easily map to or create databases, perform queries and updates from any platform that uses Java.
The rxjdbc provides efficient execution, concise code, and functional composition of database calls using JDBC and RxJava Observable
flyway (database migration)
The jongo module provides query in Java as in Mongo Shell.