This is a very simple scenario. The attached testcase has a Stage where the X coordinate is bind to a variable.

When we try to drag the Stage (manually or changing the value for X coordinate on some event), exception get thrown.


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Exception in thread "AWT-EventQueue-0" com.sun.javafx.runtime.AssignToBoundException: Cannot assign to bound variable
        at com.sun.javafx.runtime.location.FloatVariable.setAsFloat(FloatVariable.java:111)
        at com.sun.javafx.stage.WindowStageDelegate$1ComponentListener$anon8.componentMoved(WindowStageDelegate.fx:230)
        at java.awt.Component.processComponentEvent(Unknown Source)
        at java.awt.Component.processEvent(Unknown Source)
        at java.awt.Container.processEvent(Unknown Source)
        at java.awt.Window.processEvent(Unknown Source)
        at java.awt.Component.dispatchEventImpl(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Window.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)
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