Drool... is a lightweight, thread-safe, fast and efficient connection pool that can manage one to n instances of JDBC Connection pools.
Drool uses an atomic, multi-threaded, and non-blocking data-structure which provides fast and safe concurrency management. In addition, Drool has its own logging and, based on the stage of a project - developmet, testing, or production, can be configured to give verbose output about a pools state to diagnose problems or recognize bottlenecks. Finally, overall configuration is simple: (.)properties files are used to define connection pool and logging properties; in other words, there is no xml-hell!
Features and Requirements:
Runs on any OS or Application Server that can power a JVM. Pools MySql, Oracle and other datasources.