I'm trying to internationalize a test application with GWT following the instruction and I have:

com.example.client.MyConstants.java
com.example.client.MyConstants_en.properties
com.example.client.MyConstants_fr.properties
com.example.client.MyAppEntryPoint.java

In this code I have:

public interface MyConstants extends Constants
{
      @DefaultStringValue("HelloWorld")
      String hellowWorld();
}

And

public class MyAppEntryPoint implements EntryPoint
{
    public void onModuleLoad()
    {
    	MyConstants constants = GWT.create(MyConstants.class);

    	VerticalPanel mainPanel = new VerticalPanel();
    	mainPanel.add(new Label(constants.hellowWorld()));
    	RootPanel.get("myContainer").add(mainPanel);
    }
}

For MyApp.gwt.xml I have:

<module rename-to="myModule">
    <inherits name="com.google.gwt.xml.XML" />	
        <inherits name="com.google.gwt.i18n.I18N"/>

    <inherits name='com.google.gwt.user.theme.standard.Standard'/>

    <!-- Specify the app entry point class.                         -->
    <entry-point class='com.example.client.MyAppEntryPoint'/>

    <extend-property name="locale" values="en,fr"/>
</module>

In the html I have:

...

It all seems to work as long as I don't include in the xml file. As soon as I do, I get the following exception:

[ERROR] Generator 'com.google.gwt.i18n.rebind.LocalizableGenerator' threw threw an exception while rebinding 'com.example.client.myConstants'
java.lang.NullPointerException: null
...

Any help would be greatly appreciated on why it's throwing the exception.

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