Is it possible to use prototype beans within other beans in Spring?

In Spring, you can use prototype beans inside singleton beans, but it is important to note that by default, a prototype bean is created only once when the singleton bean is created, and the same instance is used thereafter.

To get a new instance of a prototype bean inside a singleton each time, you can use:

• ObjectFactory or Provider — inject a factory that will create a new bean upon request.
• @Lookup method — annotate a method that will return a new instance of the prototype bean.

Example with @Lookup:

@Component
@Scope("singleton")
public class SingletonBean {

    @Lookup
    public PrototypeBean getPrototypeBean() {
        // Spring will override this method to return a new PrototypeBean
        return null;
    }

    public void usePrototype() {
        PrototypeBean prototype = getPrototypeBean();
        prototype.doSomething();
    }
}

@Component
@Scope("prototype")
public class PrototypeBean {
    public void doSomething() {
        System.out.println("Executing prototype bean");
    }
}

Thus, you can use prototype beans inside other beans, but to correctly obtain new instances, you need to use special mechanisms.