What happens when a singleton bean contains a prototype bean?

The prototype bean is created only once, when the singleton is created. This means you won't get a new prototype instance every time the singleton uses it.

@Component
@Scope("singleton")
public class SingletonBean {
    @Autowired
    private PrototypeBean prototypeBean;

    public void show() {
        System.out.println(prototypeBean.hashCode());
    }
}

All calls to show() print the same hashCode (same PrototypeBean instance). Fix: Use @Lookup method or ObjectFactory/Provider injection.

@Autowired
private ObjectFactory<PrototypeBean> prototypeFactory;

public void show() {
    System.out.println(prototypeFactory.getObject().hashCode());
}

Invest now in Acorns!!! 🚀
Join Acorns and get your $5 bonus!

Acorns is a micro-investing app that automatically invests your "spare change" from daily purchases into diversified, expert-built portfolios of ETFs. It is designed for beginners, allowing you to start investing with as little as $5. The service automates saving and investing. Disclosure: I may receive a referral bonus.

Invest now!!! Get Free equity stock (US, UK only)!

Use Robinhood app to invest in stocks. It is safe and secure. Use the Referral link to claim your free stock when you sign up!.

The Robinhood app makes it easy to trade stocks, crypto and more.

Webull! Receive free stock by signing up using the link: Webull signup.