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But this means data transiting your network instead of being directly fetched from AWS infrastructure, which for me mostly defeats the purpose of presigned S3 URLs.

Unfortunately you can't always keep your bucket name a secret, if you use presigned URLs to let your users directly download objects...

The presentation in the article is actually top-down, contrary to the title.

An alternative title could be "all the hoops we have to jump through because we don't have lightweight threads and Loom yet".

Your first point is incorrect, inline classes can have fields that are regular reference types.

Still no official Java driver? How unfortunate...