[matsemann]

With Java 11 they hid a lot of internal functions that people had used in their code, so breaking things. But that was never really part of the public API, so strictly not a breaking change.

I remember moving to Java8 changed the iteration order of hashmaps etc, which also broke some stuff for us. But again, that was mostly our fault for relying on unspecified behavior.

[brabel]

With Java 11 they only hid it, you just need to pass some parameters to get it working. When it truly broke, I believe, was only on Java 21, which finally removed some clutches people had been using to work around the new limitations.