Tuesday, July 16, 2002 05:21 PM
I will not say that it is a bug. More likely it is a feature. Because there is not way to really update files within a zip/jar archive, jar (and Ant's jar task) creates the temporary file and copy all files from the original one and only update them if it is applicable. So, your case is just not supported.
I can suggest you to write a custom task to add a single unpacked file into archive. It is easy.