JavaFX java.lang.IllegalStateException: Location is not set - javafx

Question

Help! I'm stuck.. I try to run my main javafx app
Here is my codes;
#Override
public void start(Stage primaryStage) throws Exception {
try {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource("/com/utmkl/fxml/SimulatorDisplay.fxml"));
Parent content = (Parent)loader.load();
primaryStage.setResizable(false);
primaryStage.initStyle(StageStyle.UTILITY);
primaryStage.setScene(new Scene(content));
primaryStage.show();
} catch(Exception e) {
e.printStackTrace();
}
Below is my folder structure:
picture Folder structure
Below is the error
java.lang.IllegalStateException: Location is not set.
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2434)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2409)
at com.utmkl.VMCSManager.start(VMCSManager.java:43)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)

Answer 1

I've found the answer..
the resource need to be in the same folder structure as main class
Here is my Maven-JavaFX Folder structure
VMCS
- src/main/java
- com.utmkl
VMCSManager.java
- src/main/resources
- com.utmkl.fxml
SimulatorDisplay.fxml
So, the correct code (which success to run)
VMCSManager.java
#Override
public void start(Stage primaryStage) throws Exception {
try {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource("fxml/SimulatorDisplay.fxml"));
Parent content = loader.load();
Scene scene = new Scene(content);
primaryStage.setResizable(false);
primaryStage.initStyle(StageStyle.UTILITY);
primaryStage.setScene(scene);
primaryStage.show();
} catch(Exception e) {
e.printStackTrace();
}
}

Answer 2

Even though you do set a location with loader.setLocation(getClass().getResource("/com/utmkl/fxml/ControllerDisplay.fxml")); it is likely that the resource URL doesn't actually refer to an existing resource on the classpath.
If you add System.out.println(getClass().getResource("/com/utmkl/fxml/ControllerDisplay.fxml")); to your code I think it will print null as a result.