While it's true that they still run a lot of Java code, all of their web stack is JS. Or as they put it, everything a user sees is written in JS.
In another case, PayPal found that an app rewritten from Java to JS was more performance, serving double the req/sec one one core as the Java app did on 5 cores, so they made the switch.
PayPal has (or at least had) reportedly such a horribly awful code base, they could've rewritten it in BASIC for an interpreter and still get a 5-time performance increase, lol! Really they had to rewrite their stuff anyways. Java still is the most performant bytecode VM out there, let alone speaking of the performance of tech like GraalVM... (plus it is multithreading capable, unlike Node)
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While it's true that they still run a lot of Java code, all of their web stack is JS. Or as they put it, everything a user sees is written in JS.
In another case, PayPal found that an app rewritten from Java to JS was more performance, serving double the req/sec one one core as the Java app did on 5 cores, so they made the switch.
PayPal has (or at least had) reportedly such a horribly awful code base, they could've rewritten it in BASIC for an interpreter and still get a 5-time performance increase, lol! Really they had to rewrite their stuff anyways. Java still is the most performant bytecode VM out there, let alone speaking of the performance of tech like GraalVM... (plus it is multithreading capable, unlike Node)