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Just get an AOT compiler, plenty to choose from.

Also since Java 8 with tiered compilation, I wouldn't consider a few ms a huge startup time.

I don't think startup time is an issue, and memory is definitely manageable - check out LMAX Disruptor (https://lmax-exchange.github.io/disruptor/)

Java startup time is ~50msec, which for command line tools is fine.

Unless you run them in a loop, which is not that uncommon.