I posted a "How should we move to which JDK version?" to the user list and have had a couple of responses. http://mail-archives.apache.org/mod_mbox/incubator-river-user/201009.mbox/%3cAANLkTinK3_sHQL1t7L3B+uxwc0QEBhUxL=AvpXsv-8Kw@mail.gmail.com%3e I think it's worth keeping an eye on this.