pool

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

The Apache Commons Object Pooling Library.

Commons Database Connection Pooling

Commons Object Pooling Library

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.

Ultimate JDBC Connection Pool