Jetty has a CacheControl parameter (can be specified webdefault.xml) that determines the caching behavior of clients (by affecting headers sent to clients).
Does Tom
may be this what you are looking for :
http://tomcat.apache.org/tomcat-6.0-doc/config/context.html#Context%20Parameters
cachingAllowed : If the value of this flag is true, the cache for static
resources will be used. If not specified, the default value of the flag is true.
Also delete the application cache folder in /work/Catalina/localhost after changing this flag.