Are JSF 2.x @ViewScoped managed beans thread safe?

Question

I've been googling for a couple hours on this issue to no eval.

WELD docs and the CDI spec are pretty clear regarding thread safety of the scopes provided.

For example:

• Application Scope - not safe

• Session Scope - not safe

• Request Scope - safe, always bound to a single thread

• Conversation Scope - safe (due to the WELD proxy serializing access from multiple request threads)

I can't find anything on the View Scope defined by JSF 2.x.

It is in roughly the same bucket as the Conversation Scope in that it is very possible for multiple requests to hit the scope concurrently despite it being bound to a single view / user. What I don't know is if the JSF implementation serializes access to the bean from multiple requests.

Anyone have knowledge of the spec or of the Morraja/MyFaces implementations that could clear this up?