sql

A fast SQL database that can run embedded or a server mode with support for transactions, encryption, full search, etc. Storage can be disk-based or in-memory.

MySQL Connector/J is a JDBC Type 4 driver, which means that it is pure Java implementation of the MySQL protocol and does not rely on the MySQL client libraries. This driver supports auto-registration with the Driver Manager, standardized validity checks, categorized SQLExceptions, support for large update counts, support for local and offset date-time variants from the java.time package, support for JDBC-4.x XML processing, support for per connection client information and support for the NCHAR, NVARCHAR ...

PostgreSQL JDBC Driver Postgresql

Spring JDBC provides an abstraction layer that simplifies code to use JDBC and the parsing of database-vendor specific error codes.

HSQLDB - Lightweight 100% Java SQL Database Engine

HikariCP is a "zero-overhead" production ready JDBC connection pool.

Spark SQL is Apache Spark's module for working with structured data based on DataFrames.

Contains the core Apache Derby database engine, which also includes the embedded JDBC driver.

Commons Database Connection Pooling

Lightweight 100% Java SQL Database Engine