Java as a language totally lets you do this (and it's great!) but you'll be fighting the "culture" if you work like this in a bigger org.

In enterprise you have template repos and engineering fora where teams standardise-ish how things are done. This converges on the standard patterns, Spring, Micronaut etc.

Usually, you can deviate from these patterns at team discretion but you'll get questions from EMs and frowns from devs who roll on / off your project.