Scene Builder: cannot edit when I embed a custom control!

Question

Hi guys, I'm having an issue with Scene Builder and embedded custom controls...
I have a LoginPanel .fxml/.java module, which contains two re-usable custom controls I've built:
* StatusZone .fxml/.java
* LanguageSelector .fxml/.java
The application runs.
However, I can't open LoginPanel.fxml to edit it with SceneBuilder v1.1 (developer preview).
To be specific, in LoginPanel.fxml, I have this data:
<StatusZone fx:id="statusZone" />
<LanguageSelector fx:id="languageSelector" />
SCENARIO 1
-- LoginPanel.fxml --
<?import kalungcasev2.view.StatusZone?>
<?import kalungcasev2.view.LanguageSelector?>
I get:
Warning: File 'LoginPanel.fxml' contains references to types that could not be loaded.
Missing types are [kalungcasev2.view.StatusZone]
I can click 'Set up classpath', but no matter which folder I choose, it doesn't seem to fix the problem.
SCENARIO 2:
-- LoginPanel.fxml --
<?import kalungcasev2.view.*?>
I get:
Warning: File 'LoginPanel.fxml' contains references to types that could not be loaded.
Missing types are: [StatusZone, LanguageSelector]
I can click 'Set up classpath', but no matter which folder I choose, it doesn't seem to fix the problem.
How do I fix this?

Answer 1

Hi,
If no ClassLoader is configured in the FXMLLoader, then the FXMLLoader will try to load the
classes using the System/Context class loader.
This works well in the context of an application where everything is in the system class loader.
In SceneBuilder however - your classes will not be in the System class loader, but in a special
URL class loader that SceneBuilder created for your FXML file.
SceneBuilder sets this ClassLoader on the FXMLLoader that loads your top FXML file,
but it can't do anything for the instances of FXMLLoader that your own code creates.
Therefore - it's best to configure your FXMLLoader with the appropriate class loader,
which is usually the class loader that loaded your custom type.
See https://javafx-jira.kenai.com/browse/DTL-5177 for more details.
-- daniel
Edited by: daniel on Apr 25, 2013 7:33 AM
Sorry - to be more precise:
loader.setClassLoader(this.getClass().getClassLoader());
is the correct line.