I'd argue that one of the biggest differences between golang and java is not technical but cultural. That is, the golang idioms and thus the std libs are quicker to reach for things like object pools and other performance "hacks". Even the std http library uses an arena in golang.

Similarly, high performance Java libraries like the Disruptor, SBE or Chronicle look very much like C code.

Personally, that doesn't bother me, as it allows you to write your hot path and your non-optimized path in the same language with the same tooling.

says the guy who has split JVMs across processes for performance and contemplated doing it per core