I don't even remember Java 8 to 9 (our platform vendor updates his product and after that we have to update ours in a fairly short timeframe, so it must not hav

I don't even remember Java 8 to 9 (our platform vendor updates his product and after that we have to update ours in a fairly short timeframe, so it must not have been too painful), but I think there is a breaking change in every recent release, most recently we had to rename javax.mail to jakarta.mail and some other stuff like that when upgrading to Java 21. I don't mind but would not describe that as hassle free.