gistfile1.java

@ExtensionComponent
public class AppConfigurator implements ErraiConfigExtension {

    private final Logger logger = LoggerFactory.getLogger(AppConfigurator.class);

    public void configure(ErraiConfig config) {

        final Foo foo = new FooMock();
        ResourceProvider<Foo> fooAdapter = new ResourceProvider<Foo>() {
            public Foo get() {
                return foo;
            }
        };

        logger.info("adding binding for: " + foo.getClass());
        config.addBinding(Foo.class, fooAdapter);
    }
}

gistfile2.java

public class FooModule extends AbstractModule {
    @Override
    protected void configure() {
        bind(Foo.class).to(FooMock.class).asEagerSingleton();
    }
}