How to implement Login Dialog in JavaFX using ControlsFX

Question

I tried to use custom dialog from http://controlsfx.bitbucket.org/org/controlsfx/dialog/Dialog.html , but the code is not working throwing this exception

java.lang.NoClassDefFoundError: com/sun/javafx/scene/traversal/ParentTraversalEngine
at org.controlsfx.control.ButtonBar.<init>(ButtonBar.java:414)
at org.controlsfx.control.ButtonBar.<init>(ButtonBar.java:357)
at org.controlsfx.dialog.Dialog.createButtonPanel(Dialog.java:1034)
at org.controlsfx.dialog.Dialog.createCenterPanel(Dialog.java:1029)
at org.controlsfx.dialog.Dialog.buildDialogContent(Dialog.java:950)
at org.controlsfx.dialog.Dialog.show(Dialog.java:320)
....

The other thing is there is no example of how to integrate this to be used in a real world application, as of where do you put this code to authenticate user then continue loading your application, and maybe how to use this code to authenticate in the middle of an action, thus needs to be more re-usable.

I am using Java 8.0u20 and ControlsFX 8.0.6_20 from maven

Answer 1

Check your Java version, most likely you're running with an older version than 8u20.

You can add this line to your app to check at runtime which JRE is being used.

System.out.println(System.getProperty("java.version"));