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Spring / Spring Beans

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());
}

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