Comments on: The ant jar task and duplicate files can cause bizarre behavior and missing/incorrect files when unzipping

By: Alan jader

Alan jader — Tue, 07 Dec 2010 10:48:45 +0000

I was facing the same problem, thank you for the post, its very useful… could you tell me how do you make tests to know if its working really correct ?

ps.:in my case, I verify if there’s no duplicate in the folder with an automatic tool (www.dublicatefilesremover.com)

By: sam

sam — Wed, 02 Jun 2010 21:26:50 +0000

Thanks, saved me another 2 hours of debugging. +

By: moore

moore — Fri, 29 May 2009 13:27:09 +0000

Hi Kumar,

This issue (with zip) is only for files with the same ‘fully qualified name’. That means that the issues arises if you jar up (from the ‘src’ and ‘extra-src’ directories, respectively):
top/src/com/foo/Main.java
top/extra-ssrc/com/foo/Main.java

But if you start from the ‘top’ directoy, both Main.java files have different fully qualified names, so it’s not an issue.

Hope this helps.

By: Kumar

Kumar — Fri, 29 May 2009 04:26:57 +0000

thanks, i have one doubt regarding this. I am creating EAR file . We are working on huge project. There mey occurance of duplicate files , in the sence file name may be same in different packages. If i want to findout that duplicate file which is sitting in different packages what i have to mention in ant script. Can any one suggest me plz…………….

By: Vivek Gautam

Vivek Gautam — Mon, 16 Mar 2009 10:05:48 +0000

thanks a lot! its working, i spent a lot of time to get a solution bfore i came across ur suggestion , the code i added is as follows , may be somebody else will also benefit frm it :

By: rdixit

rdixit — Wed, 25 Feb 2009 10:58:01 +0000

I think that there should be a “overwrite” option for this. In many cases, adding does not work, nor does preserving the first option. I had a similar problem to yours and now what I do is remove the previous incorrect file and add it again from a different source.

By: moore

moore — Wed, 31 Dec 2008 22:27:20 +0000

Thanks Paul!

Alex, I think you may have had some code removed by the WP comment system….

By: Alex

Alex — Tue, 23 Dec 2008 13:11:42 +0000

Hi Dan,

I had the exact same problem duplicate files in my jar archive. Since I started java programing one month ago I’m not the best with ant. But I discovered I had a big mistake in my jar task that leads to duplicate files without a warning.

in my jar task i used basedir as attribute and also provided a fileset inside of the jar-task which looked like this:

…..

but the correct solution for me is this notation:

…..

By: Paul bourdeaux

Paul bourdeaux — Fri, 22 Aug 2008 15:33:20 +0000

Thanks for blogging about this. I recently ran into the exact same problem. I agree completely with Marc that preserve should be the duplicate, not add. I gave you some link love on my blog regarding this:
http://www.sundog.net/index.php/sunblog/entry/ant-and-duplicate-files-in-archives/

By: Marc

Marc — Fri, 11 Jul 2008 08:24:29 +0000

thanks, for sharing this info. We also spend some hours searching for some a solution due to a ZIP double entry (SUN Java Applet Runtime did not download a JAR file due to a “verification error” because of a dublicate entry)

IMHO duplicate=”preserve” should be the default, not “add”