AS5 - What is the point of setting /server/default/deploy/ear-deploy.xml's CallByValue=true?

[ndipiazza]

Probably a simple question:

I realize that /server/default/deploy/ear-deploy.xml's CallByValue=true means that all EJB3 calls will be treated as remote.

I understand that this is default false because most EJB3s and the WARs they are referenced from are on the same server, and the performance overhead of remote calls is quite costly.

What is to gain by having CallByValue=true?

[ndipiazza]

I think I might have the answer to my own question.

I found this link: https://community.jboss.org/thread/110288

He wanted to use CallByValue = true because "The original EJB authors had assumed a call-by-value behavior - i.e., changes to param objects made inside a call would be reflected outside the call without returning the param objects."

[wdfink]

From the EJB spec CallByValue=true because if you use remote interfaces this is required.

Most server optimize that and call by reference:

+ no serialization

+ less cpu and memory consumption

- change of parameter object attributes or return object attributes will be visible for both!

So it depends to the application whether it work or produce fuzzy logic.