Concurrency in JSF managed bean

[Joshua Antony]

Hi All,

We have several JSF managed beans in our applications which consist of many instance variables.

Are the beans thread safe, I mean if 5 jsf uses same bean then will it be 5 bean object created or just a single object and 5 different threads?

Regards,
Joshua

[Piotr Swiecicki]

They are thread safe unless you not bind them to the session/application scope. In that case it may happen that 2 requests will operate on the same bean instance.

[Joshua Antony]

Forgot to mention, all the beans in our application are session scoped.

I guess 2 request will operate on the same bean instance only if both request are from the same client, right?

Regards,
Joshua

[Bob Good]

One thing can happen in Internet Explorer if a user chooses 'open in new window' is that the new windows gets the same session id as the original windows. These windows would then be going after the same managed beans.
There are many situations where this can wreak havoc unless you handle it.