Hi I have probably some small problem but I can not figure it out. According
to documentation it should work but it is not.

I have defined some servervice using


 public static void bind(ServiceBinder binder) {

        binder.bind(StudioService.class, StudioServiceHibernate.class);

        binder.bind(ProjectService.class, ProjectServiceHibernate.class);

        ............
}

after that I have defined the one service using build() method 

public static DataGenerator buildDataGenerator() {
        return new DummyDataGenerator();
}

I will later make this method complicated based on some condition it will
create service using DummyDataGenerator or NoDataGenerator.

Also I have add the initialization database mathod like so

@Startup
    public static void initApplicationData(DataGenerator dataGenerator) {
        dataGenerator.generate();
    }

This line dataGenerator.generate(); throws a NullPointerException

What am I missing. Thank you in advance 

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