Observer/Observable has in my opinion never been a good pattern, using the Event management system or (in case you want to use more standard Java libraries) reactive Java libraries as "Project Reactor from https://projectreactor.io/) is a better choice.

I close this issue under the assumption that your question has been answered, please reopen if you still have a need for clarification.

Indeed, the question has been answered. Thanks for replying. I’ll check Project Reactor.