Is it possible to create your own class and have it extend the MessageClient class? This link http://email@example.comAB1iHHMWmV@.59b56dc2/1 basically describes the same issue I am having. I'm trying to access the subtopic for a messageClient but they are protected. They say you can extend the source by extending MessageClient but when I do that I get an error saying "cannot find symbol" "constructor MessageClient()".
Could someone please explain how I can extend this class to access the subtopics?