title: java.lang.NoClassDefFoundError: com/sun/javafx/css/converters/SizeConverter
body: <p>I'm creating a JavaFX app in scenebuilder.</p>
  
  <p>My FXML contains custom gluon JavaFX objects.</p>
  
  <p>I'm using their 'AppBar' and 'Icon' objects. </p>
  
  <p>When loading in the fxml file, I get a 'java.lang.NoClassDefFoundError: com/sun/javafx/css/converters/SizeConverter' error.</p>
  
  <p>Full trace:</p>
  
  <pre><code> Exception in thread "JavaFX Application Thread" java.lang.NoClassDefFoundError: com/sun/javafx/css/converters/SizeConverter
          at com.gluonhq.charm.glisten.control.AppBar.&lt;clinit&gt;(SourceFile:409)
          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.newInstanceWithCaller(Constructor.java:500)
          at java.base/java.lang.reflect.ReflectAccess.newInstance(ReflectAccess.java:166)
          at java.base/jdk.internal.reflect.ReflectionFactory.newInstance(ReflectionFactory.java:404)
          at java.base/java.lang.Class.newInstance(Class.java:591)
          at javafx.fxml/javafx.fxml.FXMLLoader$InstanceDeclarationElement.constructValue(FXMLLoader.java:1019)
          at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:754)
          at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722)
          at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
          at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
          at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:2435)
          at src.main.java.MainScreen.profileClick(MainScreen.java:107)
          at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
          at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
          at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
          at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
          at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
          at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
          at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
          at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
          at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
          at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
          at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
          at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
          at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
          at javafx.graphics/javafx.scene.Node.fireEvent(Node.java:8890)
          at javafx.controls/javafx.scene.control.Button.fire(Button.java:203)
          at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:206)
          at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
          at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
          at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
          at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
          at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
          at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
          at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
          at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
          at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
          at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
          at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
          at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
          at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
          at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
          at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
          at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3862)
          at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1849)
          at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2590)
          at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:409)
          at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:299)
          at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
          at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:447)
          at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:412)
          at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:446)
          at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
          at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
          at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
          at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
          at java.base/java.lang.Thread.run(Thread.java:830)
  Caused by: java.lang.ClassNotFoundException: com.sun.javafx.css.converters.SizeConverter
          at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)
          at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
          at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
          ... 60 more
  </code></pre>
  
  <p>I have checked past questions of a similar type, however the only solution they recommend is downgrading to Java8 - this is a Java13 project.</p>
  
  <p>To quote an accepted response:</p>
  
  <blockquote>
    <p>In Java 9, the previous internal class</p>
    
    <p>com.sun.javafx.css.converters.PaintConverter became public as</p>
    
    <p>javafx.css.converter.PaintConverter in the module javafx.graphics.</p>
  </blockquote>
  
  <p>The loading is called from this method:</p>
  
  <pre><code>private void profileClick( ActionEvent event) {
                  clearScreen();
  
                  Profile prof = new Profile();
                  ProfileController profController = new ProfileController(prof);
  
                  try{
                  mainPane.setCenter(profController.getLoader().load());
                }
                  catch(Exception e){
                    System.out.println(e);
                  }
  
              }
  </code></pre>
  
  <p>Where 'getLoader' retrieves an FXML loader with the correct directory.</p>
  
  <p>My gradle.build file is as follows:</p>
  
  <pre><code>plugins {
      id 'java'
      id 'application'
      id 'org.openjfx.javafxplugin' version '0.0.8'
  }
  
  dependencies {
      testCompile 'junit:junit:4.12'
      testCompile 'org.testfx:testfx-junit:4.0.15-alpha'
      testCompile 'org.hamcrest:hamcrest-all:1.3'
        compile "com.opencsv:opencsv:4.0"
      compile 'com.gluonhq:charm:5.0.0'
  }
  
  repositories {
    jcenter()
    maven {
         url 'http://nexus.gluonhq.com/nexus/content/repositories/releases/'
     }
     mavenCentral()
     }
  
  javafx {
      version = "13"
      modules = [ 'javafx.controls', 'javafx.fxml' ]
  }
  
  mainClassName = "src.main.java.MainScreen"
  </code></pre>
  
  <p>How would I troubleshoot this error?</p>