On the commercial JSP/Servlet containers such as WebSphere etc they have facilities to setup database connection pools (datasources). What do people do when they want to use connection pools on a Tomcat server. Do you write your own connection pool code (servlet?) or are there ones that others have written. Are there any popular/recommended ones. I don't think I need an all singing all dancing one. One that can just do the basic connection pool functions. What's the way to go here?