Geoserver is not a jetty project, contact the geoserver product or project.
This bug tracker is for Jetty 6 and earlier, and is now closed.
Jetty 6 was EOL (end of lifed) back in 2007. Jetty 7 and Jetty 8 were moved to eclipse, and are also EOL (end of lifed) back in 2014.
Jetty 9 is the current supported and stable release of Jetty, its home is at the Eclipse Foundation. http://eclipse.org/jetty/