[FIXED] Adding JFoenix JavaFX Element to FXML won't launch after compile

Issue

I am using Netbeans 8.2 and I am building a simple FXML project.

Starting from scratch and a fresh JavaFX FXML Application, Cleaning and Building works fine and Launching the example file from the /Dist/ Folder works perfect.

However,

The minute I add the JFoenix library and any JFoenix Elements to the FXML it will no longer launch after it is compiled, giving off the following.

Exception in Application start method
java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.base/java.lang.reflect.Method.invoke(Unknown Source)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(Unknown Source)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(Unknown Source)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.base/java.lang.reflect.Method.invoke(Unknown Source)
        at java.base/sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.RuntimeException: Exception in Application start method
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(Unknown Source)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(Unknown Source)
        at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoClassDefFoundError: com/sun/javafx/css/StyleConverterImpl
        at java.base/java.lang.ClassLoader.defineClass1(Native Method)
        at java.base/java.lang.ClassLoader.defineClass(Unknown Source)
        at java.base/java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(Unknown Source)
        at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(Unknown Source)
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(Unknown Source)
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
        at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
        at com.jfoenix.controls.JFXButton$StyleableProperties.<clinit>(JFXButton.java:196)
        at com.jfoenix.controls.JFXButton.<init>(JFXButton.java:156)
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
        at java.base/java.lang.reflect.Constructor.newInstance(Unknown Source)
        at java.base/java.lang.Class.newInstance(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader$InstanceDeclarationElement.constructValue(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader.load(Unknown Source)
        at javafxapplication3.JavaFXApplication3.start(JavaFXApplication3.java:22)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(Unknown Source)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$11(Unknown Source)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(Unknown Source)
        at java.base/java.security.AccessController.doPrivileged(Native Method)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(Unknown Source)
        at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
        at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
        ... 1 more
Caused by: java.lang.ClassNotFoundException: com.sun.javafx.css.StyleConverterImpl
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
        at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
        ... 37 more
Exception running application javafxapplication3.JavaFXApplication3

However Launching in the NetBeans IDE works perfectly.

What is going on here? I can see that the LIB is correctly being added to the /dist/ folder.

Solution

@james_d, Noticed I was running java 9 on my desktop but was running java 8 on the IDE.

Which explains my issues.

Answered By - MeltedPixel Mike