Are you using a JDK that has javafx? If your project JDK is Oracle Java 8 it should be there but if you're using something more recent like Java 11 you'll need to add javafx as an additional dependency.
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Are you using a JDK that has javafx? If your project JDK is Oracle Java 8 it should be there but if you're using something more recent like Java 11 you'll need to add javafx as an additional dependency.