ScalaFXML Application Cannot Find Controller - scala

Question

I have a ScalaFX application and I am using FXML for my views. I am having a terrible time connecting the views to the controllers. I cannot find much information online except examples on Github and it doesn't work even when I try to mimic how they did it. Here is how I connect it in the FXML.
imports...
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="520.0" minWidth="880.0" prefHeight="520.0"
prefWidth="880.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1"
fx:controller="scala/scalafxml/ToolbarController">
<center....
Here is my controller class...
#sfxml
class ToolbarController extends JFXApp {
//open new form
def newForm = {
val resource = getClass.getResource("/scala/scalafxml/form.fxml")
The stack trace says it specifically can't find the controller class referenced by fx:controller. Here it is.
Exception in Application start method
Workaround until RT-13281 is implemented: keep toolkit alive
[error] (run-main-0) java.lang.RuntimeException: Exception in Application start method
java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$152(LauncherImpl.java:182)
at com.sun.javafx.application.LauncherImpl$$Lambda$9/777613804.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: javafx.fxml.LoadException:
/Users/patrickslagle/scala/MyApps/PattyCakesWorksheet/target/scala-2.10/classes/scalafxml/calendar.fxml:9
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2605)
at javafx.fxml.FXMLLoader.access$700(FXMLLoader.java:104)
at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:918)
at javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:967)
at javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:216)
at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:740)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2711)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2531)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2445)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3218)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3128)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3108)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3101)
at FXMLMain$delayedInit$body.apply(FXMLMain.scala:16)
at scala.Function0$class.apply$mcV$sp(Function0.scala:40)
at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
at scalafx.application.JFXApp$$anonfun$init$1.apply(JFXApp.scala:297)
at scalafx.application.JFXApp$$anonfun$init$1.apply(JFXApp.scala:297)
at scala.collection.immutable.List.foreach(List.scala:318)
at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:32)
at scala.collection.mutable.ListBuffer.foreach(ListBuffer.scala:45)
at scalafx.application.JFXApp$class.init(JFXApp.scala:297)
at FXMLMain$.init(FXMLMain.scala:10)
at scalafx.application.AppHelper.start(AppHelper.scala:33)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$159(LauncherImpl.java:863)
at com.sun.javafx.application.LauncherImpl$$Lambda$60/206252937.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$172(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl$$Lambda$56/1146564181.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null$170(PlatformImpl.java:295)
at com.sun.javafx.application.PlatformImpl$$Lambda$58/354390534.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$171(PlatformImpl.java:294)
at com.sun.javafx.application.PlatformImpl$$Lambda$57/1198063642.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
Caused by: java.lang.ClassNotFoundException: scala/scalafxml/ToolbarController
at java.lang.ClassLoader.findClass(ClassLoader.java:530)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[trace] Stack trace suppressed: run last compile:run for the full output.
java.lang.RuntimeException: Nonzero exit code: 1
at scala.sys.package$.error(package.scala:27)
[trace] Stack trace suppressed: run last compile:run for the full output.
[error] (compile:run) Nonzero exit code: 1
[error] Total time: 11 s, completed May 24, 2016 3:32:56 PM
The FXML file is found at src/main/resources/scalafxml/calendar.fxml and the controller is in src/main/scala/scalafxml/ToolbarController.scala.
I may have something obviously wrong as I'm pretty green at Scala. Any pointers are greatly appreciated.

Answer 1

Take a look at this standalone example:
https://github.com/vigoo/scalafxml-unit-converter-example
You should have a separate controller class and a JFXApp, and use theFXMLView constructor from ScalaFXML to create the view.