Jetty is a 100% pure Java-based [server] and servlet container. Jetty is an open source project under the Apache 2.0 License. Jetty is used by several other popular projects including the JBoss and Geronimo application servers.
Jetty deployment focuses on creating a simple, efficient, embeddable and pluggable web server. Jetty's small size makes it suitable for providing web services in an embedded Java application.