JavaFX 8 and FXML DataBinding

[Sebastian Rheinnecker]

Hello,

in JavaFX 2.x versions it was possible to bind data in FXML declarations 
like this:

             <Label 
text="${corporation.employees.selectedEmployee.firstName}" />

with selectedEmployee being a SimpleObjectProperty and firstName being a 
StringProperty.

I tried the Java 8 EAP today and got the following error:

java.lang.NullPointerException
   at com.sun.javafx.fxml.BeanAdapter.<init>(BeanAdapter.java:77)
   at 
com.sun.javafx.fxml.expression.ExpressionValue$KeyPathMonitor.monitor(ExpressionValue.java:108)
   at 
com.sun.javafx.fxml.expression.ExpressionValue$KeyPathMonitor.monitor(ExpressionValue.java:121)
   at 
com.sun.javafx.fxml.expression.ExpressionValue$KeyPathMonitor.monitor(ExpressionValue.java:121)
   at 
com.sun.javafx.fxml.expression.ExpressionValue.monitorArguments(ExpressionValue.java:235)
   at 
com.sun.javafx.fxml.expression.ExpressionValue.addListener(ExpressionValue.java:196)
   at 
javafx.beans.property.StringPropertyBase.bind(StringPropertyBase.java:166)
   at 
javafx.fxml.FXMLLoader$Element.processPropertyAttribute(FXMLLoader.java:382)
   at 
javafx.fxml.FXMLLoader$Element.processInstancePropertyAttributes(FXMLLoader.java:223)
   at 
javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:576)
   at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2449)
   at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2149)
...

I believe this is due the properties get() method is returning null at 
the time the application is started (at this time no employee is 
selected). This also happens if something is directly bound to the 
property which returns null:

${corporation.employees.selectedEmployee}

As mentioned before, the BeanAdapter accepted those in JavaFX 2.x 
versions and it worked well. Is this an incompatible change or am I 
doing something wrong?

Kind regards,

Sebastian Rheinnecker

-- 
Sebastian Rheinnecker
phone: +49 7071 9709050
fax: +49 7071 9709051

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