DBCP seems to be a safe bet: http://wix.io/2013/06/12/how-many-threads-does-it-take-to-fill-a-pool/ http://wix.io/2013/06/12/how-many-threads-does-it-take-to-fi

DBCP seems to be a safe bet: http://wix.io/2013/06/12/how-many-threads-does-it-take-to-fill-a-pool/ http://wix.io/2013/06/12/how-many-threads-does-it-take-to-fi... But I think the new connection pool in Tomcat might be interesting as well.