I am facing errors while upgrading from Jetty 8 to Jetty 9 so I replaced the following: 1)SelectChannelConnector and SocketConnector with ServerConnector 2)HashSessionIdManager with DefaultSessionIdManager Afer replacing I am getting

java.lang.AssertionError: System properties invariant violated. New keys: jetty.git.hash=bc17a0369a11ecf40bb92c839b9ef0a8ac50ea18