Jetty is decomposed into many Jars providing utilities, HTTP, server, client, servlets and many optional features. It can be difficult to track which Jars are required and their dependencies.
The Jetty Dependencies reference explains the Jetty Jar structure.
You can use the he individual Jetty Jars directly by constructing your own classpath, or you can use the start.jar utility to build a classpath.
During development, the maven build tool is ideal for accessing Jetty Jars and their dependencies.
You can also use the aggregate Jars to reduce the number of Jars required.