Since Jetty moved to the Eclipse Foundation, all package names changed from "mortbay" to "eclipse", which is why logback-access 0.9.18 doesnt work with Jetty7.

When configured like described in http://logback.qos.ch/access.html I get this:
Caused by: java.lang.NoClassDefFoundError: org/mortbay/jetty/RequestLog

Can you maybe create a 2nd Jetty RequestLogImpl that uses the new "org.eclipse.jetty"-imports?

Thanks!