I have the same problem, my current workaround is to unjar the static jar, copy the new files to the unjarred location and then jar it up as a new jar. I'd like to see jar updating support though ;)
From: email@example.com [mailto:firstname.lastname@example.org]
Sent: 11 September 2000 10:12
Subject: how do you update a jar
i have tonnes of stuff to jar up - thankfully most of it is
i've created a static custom jar file which i'd like to
update with the build files.
normally it's something like: jar -uf static.jar .
ant ignores my jar task when i specify an already existing
jar to add files too.