Javafx error exception in Application start method no controller specified

Question

When I run the following code in intellij with java 8 I get an error. Please Help. The fxml is generated using the scene builder, I think the button Dagrooster isn\'t linked

Answer 1

The error says it, the FXML is missing the fx:controller declaration. Add the controller declaration to BorderPane declaration as shown :

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To know how to set controller class via SceneBuilder, you can have a look at this question.