public Injector getInjector() {
        if (injector == null) {
            injector = Guice.createInjector(createModule());
        }
        return injector;
    }
This is a repository of {@link Module}s. An instance of this class is owned by the {@link ContainerBuilder}, and is
used to configure the set of Modules that eventually form the {@link Injector} of the active {@link Container}.

@author Simon Thoresen Hult
jdisc_core/src/main/java/com/yahoo/jdisc/application/GuiceRepository.java