DBCP: database connection pooling (service)

• https://en.wikipedia.org/wiki/Apache_Commons
• http://commons.apache.org/proper/commons-dbcp/ — this one lists (most of) the following links:
• http://commons.apache.org/proper/commons-dbcp/apidocs/
• http://commons.apache.org/proper/commons-dbcp/apidocs/org/apache/commons/dbcp2/package-summary.html#package_description
• https://git-wip-us.apache.org/repos/asf?p=commons-dbcp.git
• https://git-wip-us.apache.org/repos/asf?p=commons-dbcp.git;a=tree;f=doc;hb=refs/heads/master — examples

Tomcat:

• https://tomcat.apache.org/tomcat-8.0-doc/jndi-datasource-examples-howto.html
• http://commons.apache.org/proper/commons-dbcp/configuration.html