> Spring is just a framework, not an application server with isolated classloaders that the JaveEE application servers were based on. But Spring Boot with its

> Spring is just a framework, not an application server with isolated classloaders that the JaveEE application servers were based on. But Spring Boot with its embedded HTTP server and internal infrastructure is certainly more than just a framework. It has its own class loade (launchedurlclassloader). See https://dzone.com/articles/spring-boot-classloader-and-class-override https://dzone.com/articles/spring-boot-classloader-and-class... Piranha Cloud on the other hand runs Jakarta EE code without any class loader of its own. See https://blogs.oracle.com/javamagazine/post/you-dont-always-need-an-application-server-to-run-jakarta-ee-applications https://blogs.oracle.com/javamagazine/post/you-dont-always-n...