LazyForwardingBeans.java

import com.google.common.collect.ForwardingList;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

import java.util.List;

import static org.springframework.beans.factory.config.BeanDefinition.SCOPE_PROTOTYPE;

interface Bean { }

@Component
@Scope(SCOPE_PROTOTYPE)
class JavaBean implements Bean { }

@Component
@Scope(SCOPE_PROTOTYPE)
class CoffeeBean implements Bean { }

@Component
@Scope(SCOPE_PROTOTYPE)
class RocketBean implements Bean { }

@Component
public class Beans extends ForwardingList<Bean> {

  private final ObjectProvider<Bean> beans; // can be multiple sources

  public Beans(ObjectProvider<Bean> beans) {
    this.beans = beans;
  }

  @Override
  protected List<Bean> delegate() {
    return beans.stream().toList(); // can be pre-filtered, for example
  }
}

class CoffeeShop {

  @Autowired
  Beans beans; // at this point, Spring has not initialized the beans.

  void accessBeansLazily() {
    beans.forEach(System.out::println); // initialization happens here.
  }
}