Each Resin instance can serve many virtual hosts. The virtual host will have its own servlets and documents. For greater isolation, you can configure each virtual host to have its own JVM and you can have all the virtual hosts controlled by a single web server.

Resin provides a robust and tested connection pool that is used to obtain connections to databases.

Resin's HTTP Web Server includes load balancing for scalability and reliability.

Sessions can be persistent across server restarts, including application restarts when classes change. During development, for example, using file-based persistent sessions will let you work with a single session even while you're modifying servlet classes.

A web application is a self-contained subtree of the web site. It uses Servlets, Filters, JSP, and the functionality provided by Resin and any other java code to provide a response to a client that makes an HTTP request.

To deploy to a production server a web application is packaged and then deployed.