Flume depends on Jetty 6
Which was EOL (End of Life) back in 2010 and is no longer fit for production use (without heavy customizations and modifications like Google does for GAE, just to keep it safe and vulnerability free)
Jetty was moved to Eclipse.org back during the Jetty 7 days.
Note that Jetty 7 and Jetty 8 are now also EOL (as of 2014)
Jetty 9 is the only stable and supported version of Jetty now.