About Question com.enthuware.ets.scwcd.v5.2.285 :

[max2fl]

Hi,

There is no guarantee about thread safety of attributes stored in any scope (i.e. application, session, or request).

I suppose that attributes stored in request scope they are thread safety.

[admin]

Request attribute may behave as thread safe because it is associated with one request, which in turn is processed by one container thread. However, it is possible for the servlet to create its own thread and pass the request object, in which case it won't be thread safe.

[max2fl]

in this case yes, but it's very bad idea to create your own Thread inside webApp