Demonstration for type mismath error

build.sbt

name := "Demonstration"

version := "1.0"

scalaVersion := "2.10.3"

libraryDependencies += "org.scalafx" %% "scalafx" % "1.0.0-M7"

fork in run := true

unmanagedJars in Compile += Attributed.blank(file(System.getenv("JAVA_HOME") + "/jre/lib/jfxrt.jar"))

Controller.scala

import javafx.scene.control._
import javafx.scene.image.{Image, ImageView}
import scalafx.Includes._
import javafx.fxml.FXML
import javafx.beans.property.{SimpleBooleanProperty, ReadOnlyListWrapper}
import scalafx.collections.ObservableBuffer
import scalafx.beans.property._
import scalafx.beans.value.ObservableValue

class Controller {
  @FXML
  var errorTable: TableView[Error] = null
  @FXML
  var errorMessage: TableColumn[Error, String] = null
  @FXML
  var errorSource: TableColumn[Error, String] = null
  @FXML
  var errorFixed: TableColumn[Error, Boolean] = null

  val allErrors: ObservableBuffer[Error] = ObservableBuffer(Seq(Error("src","hi", false), Error("src2","Hello", true)))
  val allErrorsCol = new ReadOnlyListWrapper(allErrors)


  def initialize() = {
    errorMessage.cellValueFactory = features => new StringProperty(features.value.message)
    errorSource.cellValueFactory = features => new StringProperty(features.value.source)
    errorFixed.cellValueFactory = features => ReadOnlyBooleanWrapper(features.value.fixed)//.asInstanceOf[ObservableValue[Boolean, Boolean]]

    errorTable.items <== allErrorsCol
  }
}

Error.scala

case class Error(source: String, message: String, fixed: Boolean=false)

main.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import java.net.*?>
<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.image.*?>
<?import javafx.scene.layout.*?>


<TabPane prefHeight="600.0" prefWidth="600.0" tabClosingPolicy="UNAVAILABLE" xmlns:fx="http://javafx.com/fxml/1"
         xmlns="http://javafx.com/javafx/2.2" fx:controller="Controller">
    <Tab text="Errors">
        <TableView fx:id="errorTable">
            <columns>
                <TableColumn fx:id="errorSource" text="Source"/>
                <TableColumn fx:id="errorMessage" text="Message"/>
                <TableColumn fx:id="errorFixed" text="Fixed"/>
            </columns>
        </TableView>
    </Tab>
</TabPane>

Main.scala

import scalafx.scene.Scene
import scalafx.application.JFXApp
import scalafx.Includes._
import javafx.fxml.FXMLLoader
import javafx.scene.Parent


object Main extends JFXApp {

  stage = new JFXApp.PrimaryStage {
    title = "Demo"

    val stage: Parent = FXMLLoader.load(getClass.getResource("main.fxml"))

    scene = new Scene(stage)
  }
}