Difficult yes, but Quarkus can do it (Java got dynamic class loading after all: https://medium.com/geekculture/speed-up-development-and-save-time-with-live-relo

Difficult yes, but Quarkus can do it (Java got dynamic class loading after all: https://medium.com/geekculture/speed-up-development-and-save-time-with-live-reload-and-testing-in-quarkus-2-0-53af6ff65edb https://medium.com/geekculture/speed-up-development-and-save... You are technically right about changing files of course, but remember: - PHP speed is all about caching. Changing a file means rebuilding (all) caches. - PHP debugging is nothing worth bragging about. Java is way more powerful and the jvm supports runtime reload of methods as well. This also goes together with the fact that most php devs are println devs (from what I have observed). And then there are other things like maintenance of old php applications is a major headache because on mac old php versions just disappear in brew. And new PHP releases like to break A LOT.