datasource

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

Commons Database Connection Pooling

Apache Commons DBCP software implements Database Connection Pooling

A mature JDBC3+ Connection pooling library

c3p0 is an easy-to-use library for augmenting traditional (DriverManager-based) JDBC drivers with JNDI-bindable DataSources, including DataSources that implement Connection and Statement Pooling, as described by the jdbc3 spec and jdbc2 std extension.

Tomcat JDBC Pool Package

Lightweight connection pool.

Dynamic Datasource Spring Boot Starter

Ultimate JDBC Connection Pool

Ultimate JDBC Connection Pool