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If that is the benchmark Erlang is way better. Java has weird delay time when JVM goes into garbage collection mode. You can finely tune it, but if you work at embedded STM32 level with serial connections where hard realtime and hardcore deterministic executions, Java is nowhere near what Rust and C++ can do. The main reason is the JVM. Different languages have different niche. Some hardcore Rust and C/C++ niche, I dont see Java can touch.

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Java can and has been used for real-time systems, but it does not look like the Java that you would come across in normal programs. Obviously, RTOS have specific requirements, which usually rule out GCs and other runtimes, where even "regular" Rust would not work. The discussion here however was for (long running) backend systems running on regular hardware. ZGC is able to achieve sub-ms pauses.

Two examples, PTC and Aicas commercial offerings, with real time GC, and AOT compilation for Java since about 20 years now.

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