Yeah that's the biggest problem, a complex web of dependencies on old legacy applications built using JDK 8/11, not so much any language changes. Sometimes ther

Yeah that's the biggest problem, a complex web of dependencies on old legacy applications built using JDK 8/11, not so much any language changes. Sometimes there's just no options to upgrade e.g. companies stuck on Oracle 12, can only use Flyway 5.1.4 etc, so that counts out Spring 2.5.x and so on and so on. Many libraries will eventually drop support for older JREs, and then you're left with a big bang approach and having to upgrade everything to the latest version, and that may include changes in the servlet/REST/etc specs, which can be a bit overwhelming for large legacy codebases. Its why tools like Dependabot are so important imo, they keep you up-to-date in incremental steps if you're vigilant, rather than have the POM/build.gradle ossify over time.