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The ngx_lua solution is awesome, but Taobao runs mostly on Java, not Lua. The software stack is Nginx(Tengine)-Java-MySQL.

I know URL file extensions aren't necessarily related to the technologies being used, by why is it that the URLs end in .php on taobao.com? Did they migrate from PHP to the new stack and then want to keep the existing URLs for some reason?

Not all of Taobao. Most of the business logic is still written in Java.

Could someone please expand on how they integrate Java with nginx/tengine and Lua?

OT: sounds like there's where GO should be, integrated with Nginx to have an end-to-end async stack.