How to add Richfx in a layout - user-interface

Question

I have been trying to add an InlineStyleTextArea and a CodeArea in anylayout both in the main method in javafx and in a fxml file. I receive a thread error. Please if possible with examples how can i add these components to a javafx layout? If possible with a tutorial link.
This is a simple code
public class Main extends Application {
#Override
public void start(Stage primaryStage) {
TextField myTextField = new TextField();
InlineCssTextArea TextArea = new InlineCssTextArea();
HBox hbox = new HBox();
hbox.getChildren().add(myTextField);
hbox.getChildren().add(TextArea);
HBox.setHgrow(myTextField, Priority.ALWAYS);
HBox.setHgrow(TextArea, Priority.ALWAYS);
Scene scene = new Scene(hbox);
primaryStage.setScene(scene);
primaryStage.show();}
public static void main(String[] args) {
launch(args);
}
}
Exception in Application start method
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(Unknown Source)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$152(Unknown Source)
Caused by: java.lang.NoClassDefFoundError: org/reactfx/value/SuspendableVal
at application.Main.start(Main.java:20)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$159(Unknown Source)
at com.sun.javafx.application.LauncherImpl$$Lambda$53/19776028.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$172(Unknown Source)
at com.sun.javafx.application.PlatformImpl$$Lambda$45/18503843.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null$170(Unknown Source)
at com.sun.javafx.application.PlatformImpl$$Lambda$48/3799573.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$171(Unknown Source)
at com.sun.javafx.application.PlatformImpl$$Lambda$46/2180324.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$145(Unknown Source)
at com.sun.glass.ui.win.WinApplication$$Lambda$36/3326003.run(Unknown Source)
... 1 more
Caused by: java.lang.ClassNotFoundException: org.reactfx.value.SuspendableVal
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 15 more
Exception running application application.Main
at com.sun.javafx.application.LauncherImpl$$Lambda$50/14845382.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Answer 1

From the stack trace, it looks like the Java Runtime can't find (at least one class in) the ReactFX library, which is a dependency of RichTextFX. Since it gets as far as looking for that, it must have found InlineCssTextArea, so the RichTextFX library must be installed.
If you are using some kind of dependency management (Gradle or Maven, for example), that tool should manage all the dependencies for you.
If you are managing the dependencies by hand (i.e. downloading jar files and adding them to the classpath), you need to make sure you either download all the dependent jar files as well, or use the "Fat jar file".