[FIXED] IntelliJ, .jar executable not behaving properly "java.lang.reflect.InvocationTargetException"

Issue

I have a JavaFX program that I need to make executable. I'm currently trying to do it with IntelliJ IDEA, it does create the .jar, but when I try to click on a clickable item that should pop a window it doesn't and instead in the console it prints this error:

href="https://i.stack.imgur.com/eUcSK.png" rel="nofollow noreferrer">Screenshot of the error I get

If it can be helpful this is a screenshot of the internal structure of the project + whats inside the manifest

I should also specify that I imported the javaFX library in Project Structure -> Artifacts.

(I already made a .jar executable for another project and worked fine there, but it didn't had any pop-up windows nor multiple .fxml / controllers... so I think that might be whats making it crash, but I'm not sure)

Edit: Also I forgot to say that the problem i reported above only happens in the .jar, if i debug the program/run it through the IDE it works perfectly fine.

Edit (Error code copy-pasted):

    Dec 30, 2021 6:51:43 PM javafx.fxml.FXMLLoader$ValueElement processValue
WARNING: Loading FXML document with JavaFX API of version 16 by JavaFX runtime of version 11.0.2
java.lang.IndexOutOfBoundsException: Index 0 out of bounds for length 0
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
        at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1787)
        at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1670)
        at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
        at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
        at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
        at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
        at javafx.event.Event.fireEvent(Event.java:198)
        at javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3564)
        at javafx.scene.Scene$ClickGenerator.access$8200(Scene.java:3492)
        at javafx.scene.Scene$MouseHandler.process(Scene.java:3860)
        at javafx.scene.Scene$MouseHandler.access$1200(Scene.java:3579)
        at javafx.scene.Scene.processMouseEvent(Scene.java:1849)
        at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2588)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:434)
        at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:390)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433)
        at com.sun.glass.ui.View.handleMouseEvent(View.java:556)
        at com.sun.glass.ui.View.notifyMouse(View.java:942)
        at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
        at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:76)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:273)
        at com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:83)
        at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1782)
        ... 31 more
Caused by: java.lang.IllegalStateException: Location is not set.
        at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2459)
        at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2435)
        at Controllers.Home.LWELencoClick(Home.java:521)
        ... 43 more

Solution

I solved it. The error was that I had a ".." at the start of a path that was pointing towards the FXML. So the IDE was all ok with that, but the .jar works differently so it was throwing errors for the path.

this is the line that was giving the error

fxmlLoader = new FXMLLoader(getClass().getResource("../FXML/CentroVaccinaleRG.fxml"));

this is how I modified it

fxmlLoader = new FXMLLoader(getClass().getResource("/FXML/CentroVaccinaleRG.fxml"));

Answered By - Code-Dani
Answer Checked By - Pedro (JavaFixing Volunteer)