原来，JavaFX是元凶.

Turns out that JavaFX is the culprit.

您可以按如下所示禁用模块 JavaFX Wrapper :

You can disable module JavaFX Wrapper as indicated below:

Projects/Feed Runner Application
  -> Properties
    -> Libraries
      -> (platform)
        -> (JavaFX wrapper)   [ ] included  (i.e: not included!)

https://netbeans.org/bugzilla/show_bug.cgi?id=250440