Java EE (Java Enterprise Edition) General Discussion

Hi,

I have a war file that has some files in it. I would like to update the war file to replace an existing web.xml file and add a new file in a different directory.
I know that i can simply unzip the file and make the changes then zip it back again.

I would like to do this using Ant but i was wondering if it is possible to do the update with only the updated files. I think the way ANT would work is it would check every file on the new directory and replace it if it is newer. The problem i have is i dont have copies of the existing files in the war file. I only have the files i want to replace in the war file. If i try it, will i end up with a new war file with just the new files and everything else deleted or will it just update the new file?