Java cannot find JavaFx classes although present in JDK

Question

I am currently working on an application using javafx for its UI. I am using java 9. When I pulled from github to continue development on my new computer and compiled, there

Answer 1

Your IDE may have set the project up as a "modular" Java 9 project. In modular projects, you specify which other modules the project depends on, and which packages in your module(s) should be exposed to other modules. A good general tutorial on modules is at the OpenJDK wiki.

If there's a module-info.java file in the classpath root, you need to explicitly state that your module requires access to the appropriate JavaFX modules. It may be enough just to add

requires javafx.controls ;

to this file: that will give you access to the javafx.controls module, and the modules on which it depends (javafx.graphics and javafx.base). Depending on your project, you may also need

requires javafx.fxml ;

and/or

requires javafx.web ;

etc.