Tornadofx: Resource must not be null exceptions occurs when generated jar file is run.When I run the project , it totally fine.I use fxml for resources.

[Leo-Thura]

tornadofx.DefaultErrorHandler uncaughtException
SEVERE: Uncaught error
java.lang.IllegalStateException: component.javaClass.getResource(resource) must not be null

[SchweinchenFuntik]

describe in more detail namely:

• a simple example where the error is reproduced;
• specify the project build system;
• project structure if it differs from the standard

[Leo-Thura]

java.lang.IllegalStateException: component.javaClass.getResource(resource) must not be null
at tornadofx.ResourceLookup.url(Component.kt:1304)
at tornadofx.FX$Companion$fxmlLocator$1.invoke(FX.kt:114)
at tornadofx.FX$Companion$fxmlLocator$1.invoke(FX.kt:88)
at tornadofx.UIComponent.loadFXML(Component.kt:1119)
at tornadofx.UIComponent$fxml$1.(Component.kt:1113)
at tornadofx.UIComponent.fxml(Component.kt:1112)
at tornadofx.UIComponent.fxml$default(Component.kt:1112)
at view.MainView.(MainView.kt:21)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
at java.base/java.lang.Class.newInstance(Class.java:584)
at tornadofx.FXKt.find(FX.kt:434)
at tornadofx.FXKt.find$default(FX.kt:423)
at tornadofx.App.start(App.kt:83)
at main.MyApp.start(MyApp.kt:54)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:277)
at java.base/java.lang.Thread.run(Thread.java:834)

I use gradle build system

`class AppLauncher {

companion object {

    @JvmStatic
    fun main(args : Array<String>) {

        MyApp().main(arrayOf())
    }

}

}`

I also use this app launcher class to launch the MyApp application.

The output is shown when I run the generated jar file.But the project perfectly worked.

`plugins {
id 'application'
id 'org.jetbrains.kotlin.jvm' version '1.3.72'
id 'org.openjfx.javafxplugin' version '0.0.9'
}

group 'org.example'
version '1.0-SNAPSHOT'

repositories {
mavenCentral()
jcenter()
}

javafx {
version = "11.0.2"
modules = ['javafx.controls', 'javafx.graphics']
}

jar {

manifest {
    attributes('Main-Class': 'main.MyApp')
}

}

dependencies {

implementation "org.jetbrains.kotlin:kotlin-stdlib"
implementation 'no.tornado:tornadofx:1.7.20'
implementation "org.openjfx:javafx:11.0.2"
implementation "org.openjfx:javafx-base:11.0.2"
implementation "org.openjfx:javafx-controls:11.0.2"

implementation 'no.tornado:tornadofx-controlsfx:0.1'

implementation 'org.jetbrains.exposed:exposed-core:0.24.1'
implementation 'org.jetbrains.exposed:exposed-dao:0.24.1'
implementation 'org.jetbrains.exposed:exposed-jdbc:0.24.1'
implementation 'org.jetbrains.exposed:exposed-jodatime:0.24.1'
implementation 'mysql:mysql-connector-java:5.1.48'
implementation 'org.slf4j:slf4j-simple:1.7.21'
implementation 'org.apache.poi:poi:4.1.2'

}

compileKotlin {
kotlinOptions.jvmTarget = "1.8"
}

compileTestKotlin {
kotlinOptions.jvmTarget = "1.8"
}`
This is my build.gradle file

In main view class , I access the fxml file like this.The fxml file is located under resources directory

`class MainView : View("MainView") {

override val root : BorderPane by fxml("/MainView.fxml")

}`

But jar file worked when I don't use fxml

class MainView : View("MainView") { override val root = borderpane { } }

[SchweinchenFuntik]

MyApp().main(arrayOf())

incorrect launch
https://edvin.gitbooks.io/tornadofx-guide/content/part1/3_Components.html

// 
fun main(args: Array<String>) {
  launch<MyApp>(args) // start app JavaFX (TornadoFX)
}

[SchweinchenFuntik]

very similar to https://github.com/edvin/tornadofx/issues/1268

what version of TornadoFX and JavaFX do you have?

https://github.com/edvin/tornadofx/issues/1268#issuecomment-681109682

[Leo-Thura]

Tornadofx : 1.7.20 and Javafx : 11.0.2

[SchweinchenFuntik]

answer above, you need "TornadoFX 2.0-SNAPSHOT"
https://github.com/edvin/tornadofx/issues/1268#issuecomment-681426394

[Leo-Thura]

I tried Snapshot version . I still get the same error when I run the generated jar file.

[SchweinchenFuntik]

Have you changed the application launch?

[SchweinchenFuntik]

also make sure you are using the correct version

[Leo-Thura]

Yes . I changed the application launch.

[Leo-Thura]

I'm currently using JDK 11 . Do I need to change to higher JDK?

[Leo-Thura]

`
class TestView : View("My View") {

override val root : Parent = FXMLLoader.load(javaClass.getResource("/TestView.fxml"))

}`

*When I load fxml using FXMLLOADER , I get new error :-) *

tornadofx.DefaultErrorHandler uncaughtException
SEVERE: Uncaught error
java.lang.NullPointerException: Location is required.
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3230)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3194)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3163)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3136)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3113)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3106)
at main.TestView.(TestView.kt:9)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
at java.base/java.lang.Class.newInstance(Class.java:584)
at tornadofx.FXKt.find(FX.kt:434)
at tornadofx.FXKt.find$default(FX.kt:423)
at tornadofx.App.start(App.kt:83)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:277)
at java.base/java.lang.Thread.run(Thread.java:834)

[SchweinchenFuntik]

I'll try to throw off an example project tomorrow

[Leo-Thura]

Finally I found a solution . May not be a good solution . But it works for me.

`
class TestView : View("My View") {

private val url = File("src/main/resources/TestView.fxml").toURI().toURL()
override val root: Parent =  FXMLLoader(url).also { loader -> loader.setController(this) }.load()

@FXML
lateinit var lbl_test : Label

init {

    lbl_test.text = "This is testing string"
}

}`

[SchweinchenFuntik]

here is an example project TornadoFX simple.zip