I am trying to build a desktop app with lots of custom GUI components, involves custom GUI component/event + drag and drop. I am fairly proficient in Java and I

I am trying to build a desktop app with lots of custom GUI components, involves custom GUI component/event + drag and drop. I am fairly proficient in Java and I think Swing would good option for me to start building the app. Currently I am reading "Filthy Rich Client". I have not investigated into JavaFX yet. I know for desktop C++/Qt is a better solution, but I don't want to go back to C++ and because i don't feel comfortable the language features and it's tool chain. I like the Java ecosystem, and I think I will be more productive in Java/Swing. Do you have any suggestion for building desktop app with custom GUI? Should I avoid working with Swing? What other language/framework combination do you think a better fit for the project?