On MacOS platform, Java Accessibility framework used informal protocol developed by Apple [1]. That protocol was deprecated and now Apple does not recommend using it. To get rid of potential issues caused by outdated protocol and to be compliant with the latest requirements [2] the native part of Java Accessibility feature was reimplemented.

[1] - https://developer.apple.com/documentation/appkit/deprecated_symbols/nsaccessibility
[2] - https://developer.apple.com/documentation/appkit/nsaccessibilityprotocol