JavaBeans specification defines a rule how to infer property name from its setter and getter. This rule states to convert the first character of <PropertyName> in get<PropertyName>, set<PropertyName> to lowercase unless the <PropertyName> starts with two uppercase characters (this is implemented by java.beans.Introspector.decapitalize).

Examples:
getName, setName -> name
getURL, setURL -> URL

In addition to set<PropertyName>, get<PropertyName>, Java FX defines the <propertyName>Property method which returns the corresponding property object. Because the name of this method doesn't have any common prefix, the <propertyName> should match the inferred property name.

Examples:
getName, setName -> nameProperty
getURL, setURL -> URLProperty

Currently there are three properties which don't follow this JavaBean property name inference rule.

They are:
javafx.scene.chart.XYChart.Data: xValueProperty
javafx.scene.chart.XYChart.Data: yValueProperty
javafx.scene.shape.ArcTo: xAxisRotationProperty


The correct names should be:
XValueProperty (getXValue, setXValue -> XValueProperty)
YValueProperty (getYValue, setYValue -> YValueProperty)
XAxisRotationProperty (getXAxisRotation, setXAxisRotation -> XAxisRotationProperty)