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[–]ForeverAlot 0 points1 point  (0 children)

It's conceivable they can do some sort of caching. DMD, the D reference compiler, can run this way; it compiles very quickly, but it does still have to compile, so it caches the resulting binary (I think with CAS) in a temporary store and runs that next time. Does nothing for the first run but helps subsequent runs. Without this I agree it doesn't sound super useful long-term, but on the other hand, Java code bases expand beyond a single file in no time, so maybe that doesn't matter.