I'm using ant 1.8.2 and I have a large Ear file.
Slight changes to the ear are needed, depending on user selection during install.
At the end of the install process, I run an ant script which updates the ear based on the user's selections. These files are only to be included in the ear, if the user has related licensing... so the update is necessary.
Currently I'm exploding the whole ear, adding the necessary files, then making the updated ear.
I'm hoping to find a way in which I can remove and/or add files without having to go through the whole unzip/update/zip process.
The ear task has an update attribute, which you can set to true.
This way files will be added to the existing zipfile, instead of creating a new one.