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    Slightly O/T, but can you link to Oracle's three "official JVM implementations"? Commented Mar 17, 2020 at 15:43
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    An important note re "performance" is that different versions of the JVM are optimized for different usage scenarios. If one implementation takes 100 milliseconds to run a piece of code the first time, and 0.01 milliseconds per time thereafter, while another takes 1 millisecond every time, the latter might be about 100 times as fast if the piece of code runs only once, but the former might be almost 100 times as fast if the piece of code runs a million times. Commented Mar 17, 2020 at 21:37
  • Note that the earlier licensing policies required payment for many uses, so there were many more reasons not to like them. As far as starting of Android project mobile use required commercial license, so Android got its own JVM too. And they've recently become stricter again, but there is now the OpenJDK that didn't exist bak where GCJ and such were created. Commented Mar 17, 2020 at 22:15
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    @skomisa The answer names three Oracle JVM implementations (HotSpot, Squawk, KVM). Commented Mar 18, 2020 at 11:46
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    @Jimmy JRockit hasn't been a product in almost a decade by now, not sure we would really want to count that ;) (There's Graal for another Oracle JVM though) Commented Mar 18, 2020 at 15:05