性能问题JSF-托管Bean内的托管Bean注入

Question

I am using an existing application based on JSF2.0 and over top we are using Primefaces. I have seen, people have injected on managed bean inside another managed bean. I am looking forward to know, is it a good practice? What about the performance drawbacks? I see our application behaves very slow in Performance Testing environment. Another thing, inside a ManagedBean annotation, we have a concept of "eager", how useful this attribute is?

Thanks.

Answer 1

AFAIR it's not a good practice if serialization is enabled - which is required if you use client side state or session replication/clustering.

eg if you have 2 viewscoped beans on the same view ("A" and "B") and inject "B" into "A". "A" will be serialized 1 time and "B" will be serialized 2 times.

This problem will not occur if you CDI because only proxies will be injected and not the real instance.