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by philbarr 4428 days ago
Each JAR is just a zip file. It can be convenient to merge all those JAR files into one for deployment so you don't have to have all the JAR files lying around in the system and upgrades are just "replace this one JAR file" (among other reasons).

Since each JAR is just a zip if you have two files in seperate JARs with the same path you'll have a problem when you try to merge them.