The following FXML file throws an NPE when parsing:

<BorderPane id="background" prefWidth="800.0" prefHeight="600.0" xmlns:fx="http://javafx.com/fxml">
    <top>
        <ToolBar>
            <HBox>
                <Button text = "Tasks" />
                <Button text = "Administrator" />
            </HBox>
        </ToolBar>
    </top>
</BorderPane>

I think the problem is that ToolBar doesn't have a @DefaultProperty. I believe the following patch is all that is needed? If this looks right I'm happy to test and apply the patch. I think we also need to improve the error reporting in the FXML parser, it wasn't clear from the NPE error I got what the problem was, so I had to start divide and conquer to find out which part of the FXML file was causing the error.

diff -r 5fd0bc71c9d6 javafx-ui-controls/src/javafx/scene/control/ToolBar.java
--- a/javafx-ui-controls/src/javafx/scene/control/ToolBar.java Wed Feb 01 09:34:37 2012 -0500
+++ b/javafx-ui-controls/src/javafx/scene/control/ToolBar.java Mon Feb 06 10:15:35 2012 -0800
@@ -29,6 +29,7 @@
 import java.util.Collections;
 import java.util.List;
 
+import javafx.beans.DefaultProperty;
 import javafx.beans.property.ObjectProperty;
 import javafx.beans.value.WritableValue;
 import javafx.collections.FXCollections;
@@ -76,7 +77,7 @@
  * </code></pre>
  *
  */
-
+@DefaultProperty("items")
 public class ToolBar extends Control {
 
     /***************************************************************************