The simplest jetty config file for a single webapp.

jetty-single-webapp.xml

<?xml version="1.0"?>
<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure.dtd">

<Configure class="org.eclipse.jetty.server.Server">
	<Set name="connectors">
		<Array type="org.eclipse.jetty.server.Connector">
			<Item>
				<New class="org.eclipse.jetty.server.nio.SelectChannelConnector">
					<Set name="Port"><SystemProperty name="jetty.port" default="8080"/></Set>
				</New>
			</Item>
		</Array>
	</Set>

	<Set name="handler">
		<New class="org.eclipse.jetty.webapp.WebAppContext">
			<Arg><SystemProperty name="webapp" default="../webapp"/></Arg>
			<Arg><SystemProperty name="webapp.context" default="/"/></Arg>
		</New>
	</Set>
</Configure>