I'd like to synchronize a value among multiple objects with bidirectional bindings. Example:
{code}
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
 
public class SandboxBindingDoubleProperties
{
public static void main(String[] args)
{
DoubleProperty doubleProperty1 = new SimpleDoubleProperty(1);
DoubleProperty doubleProperty2 = new SimpleDoubleProperty(2);
DoubleProperty doubleProperty3 = new SimpleDoubleProperty(3);

doubleProperty1.bindBidirectional(doubleProperty2);
doubleProperty2.bindBidirectional(doubleProperty3);
 
doubleProperty1.set(4);
System.out.println(doubleProperty1.doubleValue());
System.out.println(doubleProperty2.doubleValue());
System.out.println(doubleProperty3.doubleValue());
doubleProperty2.set(5);
System.out.println(doubleProperty1.doubleValue());
System.out.println(doubleProperty2.doubleValue());
System.out.println(doubleProperty3.doubleValue());
doubleProperty3.set(6);
System.out.println(doubleProperty1.doubleValue());
System.out.println(doubleProperty2.doubleValue());
System.out.println(doubleProperty3.doubleValue());
}
}
{code}
The output is:

4.0
3.0 <- error, should be 4.0
3.0 <- error, should be 4.0
5.0
5.0
5.0
6.0
6.0
6.0

A change in the binding order leads to the expected behaviour:
{code}
doubleProperty2.bindBidirectional(doubleProperty3);
doubleProperty1.bindBidirectional(doubleProperty2);
{code}
4.0
4.0
4.0
5.0
5.0
5.0
6.0
6.0
6.0

An additional but superfluous binding to the original example also leads to the expected behaviour:
{code}
doubleProperty1.bindBidirectional(doubleProperty2);
doubleProperty2.bindBidirectional(doubleProperty3);
doubleProperty3.bindBidirectional(doubleProperty1);
{code}
Starting with no-args constructors also leads to expected behaviour:
{code}
DoubleProperty doubleProperty1 = new SimpleDoubleProperty();
DoubleProperty doubleProperty2 = new SimpleDoubleProperty();
DoubleProperty doubleProperty3 = new SimpleDoubleProperty();
{code}