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 :

...
<BorderPane maxHeight="1.7976931348623157E308" 
      maxWidth="1.7976931348623157E308" prefHeight="400.0" 
       prefWidth="600.0" xmlns="http://javafx.com/javafx/8"
         xmlns:fx="http://javafx.com/fxml/1" 
                          fx:controller="Weert.Controller">
...

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

Answer 2

As the error implies, problem is in "fxml", in which it is referring to class which do not exist. To solve this search an attribute called "fx:controller" and assign it qualified class name . For an instance "fx:controller="packagename.className".

Answer 3

It is true you havent told the fxml file where the controller class is...

this ...

<BorderPane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1">

As this...

<BorderPane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="Weert.Controller">

Or even this...

<BorderPane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="Controller">

.. then put both files in the same folder