On your constants interface add this @Generate(format =
"com.google.gwt.i18n.rebind.format.PropertiesFormat")
then compile your gwt code with -extra extras
@Generate(format =
"com.google.gwt.i18n.rebind.format.PropertiesFormat")
public interface ExampleConstants extends ConstantsWithLookup {
@DefaultStringValue("New")
String newButton();
}
That should generate a properties file with
newButton = New