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From Mark Smith <>
Subject Re: Jar update problem
Date Tue, 04 Mar 2003 01:44:58 GMT
Well there is one way to accomplish what you were intially thinking. 
That is to scan the fileset that will makeup the jar for files in it
that are newer than the jar itself.  Then manually do a jar update on
each individual file.

That would work, right?


On Mon, 2003-03-03 at 19:17, Steve Drach wrote:
> I said I had the exact same problem, but I actually misunderstood what
> it means to update a jar file using the* API.  In
> Java you can't just add an entry to an existing jar (or zip) file,
> because there is no API method to do that.  You must copy entries
> from one jar file to a new one.  Here, update means to replace older
> entries with new ones, add new ones, and copy older entries that
> don't have newer counterparts.  The end result is you create a new
> jar file that is a duplicate of the old jar file with updated entries.
> I was thinking you could just take the old jar file and replace entries in
> it if newer entries were found, because I thought that was how unix
> zip worked.  But thinking about it, you can't do that.  In order to do
> that, you'd have to invalidate old entries and add the newer counterparts.
> Your zipfile would grow and contain lots of garbage.  Rewriting the
> entire zip file is the only way that makes practical sense.
> -----Original Message-----
> From: Steve Drach []
> Sent: Friday, February 28, 2003 3:44 PM
> To:
> Cc:
> Subject:
> I have the exact same problem with "Apache Ant version 1.6alpha compiled
> on February 28 2003."  This is on Solaris 2.8, so it doesn't seem like
> it's been fixed.  Is there an open bug report on this?
> -----Original Message-----
> From: Dominique Devienne <>
> Subject: jar update quesiton
> Date: Fri, 31 Jan 2003 13:44:13 -0600
> Content-Type: text/plain
> Well known bug, to be fixed for Ant 1.5.2 and 1.6. Ant BugZilla is
> littered with bug entries for the <jar update="true"> problem. Use a
> nightly build of CVS were it's supposed to be 99% fixed. --DD
> -----Original Message-----
> From: Mark Smith []
> Sent: Friday, January 31, 2003 1:21 PM
> To:
> Subject: jar update quesiton
> Hi,
> I've been looking through this newsgroup and couldn't find someone that
> asked this particular question...  How do I use the <jar> task to update
> a jar file when only a few files in it has been updated?
> For example, when doing daily development, I compile my entire codebase,
> then jar up a chunk of it for my applet/webstart stuff, then I start my
> application, all within ant.  So for the <jar> task, I only want files
> that have been updated to be updated to the jar.  I don't want the
> entire jar file to be recreated.
> I've played with the update and duplicate options in the <jar> task and
> ran in --verbose mode but can't get the effect I'm looking for..  Seems
> like no matter what I do, whenever a file is updated, the <jar> task
> adds an entry for *every* file, not just the updated files.  Also, the
> ant documentation does not state what the possible values are for the
> "update" tag within the <jar> task.
> Any help is greatly appreciated.
> Thanks,
> Mark

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