gistfile1.java

@Configuration
@Import(MyFrameworkConfiguration.class)
public class UserConfig implements MyFrameworkInitializer {
    @Bean
    public FooCallback fooCallback() {
        return new FooCallback() {
            public void doWithFoo(Foo foo) {
                foo.setAwesome(true);
            }
        };
    }
}


public interface MyFrameworkInitializer {
    FooCallback fooCallback();
}


@Configuration
public class MyFrameworkConfiguration {

  @Autowired(optional=true)
  private FooCallback fooCallback;

  @PostConstruct
  public void initialize() {
    if (fooCallback != null) {
        fooCallback.doWithFoo(foo());
    }
  }
  
  @Bean
  public Foo foo() {
  }

}