Phillip Webb f84323fe3e Prevent duplicate jar entries from being written
Update the `AbstractJarWriter` so that it can directly build the layer
index as entries are written. Prior to this commit, a layer tracking
was handled by a decorator class which was broken because it didn't
override enough methods. Since `AbstractJarWriter` has quite a complex
API, it seems sensible to have it handle the layer index directly,
removing the need for a decorator entirely.

Fixes gh-23801
2020-10-22 20:55:09 -07:00
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