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This post is a synthesis of information from several sources and provides step-by-step instructions for building and deploying a Ruby in Rails application to Glassfish that uses J2EE standard JDBC connection pooling mechanisms. This is the preferred method for production deployments to a J2EE server of any scale, since * it leverages J2EE deployment mechanisms, fully separating operational and development roles (database passwords can be configured by operations using the same mechanisms used fro J2EE applications), and * it utilizes the connection pooling mechanisms available in J2EE servers to reduce connection overhead for managing connections to the database server, increasing scalability and reducing CPU and memory utilization for this activity.