Synchronise request object?

[Mike Thomson]

In Head First Servlet and JSP, they have mentioned session and context attributes are not thread safe and only the request attributes are thread safe. So we don't need to synchronize the request object like synchronize the session and context object.
If so, my doubt is why request object is synchronised in <jsp:useBean.. scope="request"> page no:348 - chapter - 8 in HFSJ

[Mike Thomson]

Let me rephrase my question:

"Is there under any circumstance/necessary to synchronize the request object?"

[Seetharaman Venkatasamy]

Originally posted by Mike Thomson:
"Is there under any circumstance/necessary to synchronize the request object?"

there is only one thread per request. so request is thread-safe.why you want to synchronize again? if you want then do in this way

   
 
synchronized(request){

}
 
 

but it looks bad

[Pavan BH]

Since there is only one thread per request

there is no need of sinchronizing

[Mike Thomson]

Seetharaman,

I know request attributes are thread safe and no need to synchronize as we are doing for context and session.

But in the Head first Servlets and JSP book,
for <jsp:useBean.. scope="request">, the generated servlet code in _jspService() method, they have synchronized the request object like below:

foo.person person = null;
synchronized(request){
 person = (foo.person)_jsp......
....

[RaviNada Kiran]

Unless and until you are creating any Threads manually in your servlet file which access the request , there is no need to synchronize the request.