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<@U7HPJNG20> I consulted on a Kafka / Camel job a few years back when I installed a Talend ESB.  I think a front-end for this is a great idea.

I recommend using the Type Safe Builders instead of FXML.  I've written a lot of FXML and the tools like Scene Builder haven't developed into anything like XCode or Visual Studio.  While TornadoFX supports FXML as you found out, you hit a wall as you start to nest things which is important for good FXML design.

Also, with FXML, you'll miss out on a lot of TornadoFX.  I would use the by fxid() only to integrate legacy code (and only temporarily).