RE: Web Service with state

[tony . q . weddle]

Each web service instance could, potentially, process requests from many different clients. I'm sure that this is the reason for the stateless requirement. Static state is not an issue, only instance state, where the service stores information from previous requests to process future requests, is prohibited. State can be stored in a session, if necessary.

Tony

"Rajdeep Dua" <[EMAIL PROTECTED]> wrote on 23/12/2004 10:08:03:

> I had asked this question yesterday also.
> Wanted to know why the J2EE and JAX-RPC specs talk
> about web service to be represented using stateles
> components when there can be several instances of
> usage for a stateful usage
> --- Merten Schumann <[EMAIL PROTECTED]> wrote:
>
> > Yes, in fact in J2EE 1.4 only stateless session
> > beans (not statefull
> > ones) can expose their interface as web service.
> > But, the quotation was
> > not that implementation specific, it was "web
> > service has to be
> > state-less" and this is not true IMHO. I do maintain
> > "global state" in
> > my web service (just static variables right now)
> > which could be accessed
> > by any SLSB instance within the same JVM. Works for
> > EJB way (SLSB) and
> > JAX-RPC way.
> >  
> > cu
> >    Merten
> >
> >
> > ________________________________
> >
> >    From: Peter Smith
> > [mailto:[EMAIL PROTECTED]
> >    Sent: Thursday, December 23, 2004 5:11 AM
> >    To: [EMAIL PROTECTED]
> >    Subject: Re: Web Service with state
> >    
> >    
> >    
> >    
> >
> >          Have read that web service has to be state-less.
> > Why is that?
> >              
> >
> >      
> >       Where did you read that?
> >       Maybe it's a hint which should be followed if
> > possible,
> > but nothing more
> >       IMHO.
> >        
> >
> >    
> >    From J2EE1.4 web services point of view this is not
> > a "hint" at
> > all....
> >    
> >    See "Web Services for J2EE, Version 1.0" (aka
> > JSR-109 for
> > J2EE1.4) [ref
> > http://www.jcp.org/en/jsr/detail?id=109]
> >    
> >    [section 5.3.2.1 EJB Container programming model] A
> > Service
> > implementation bean *must* be a stateless object
> >    
> >    [section 5.3.2.2 Web Container programming model] A
> > Service
> > implementation *must* be a stateless object
> >    
> >    and [section 1.4 document conventions] "MUST"
> > meaning is from
> > RFC 2119 [ref http://www.faqs.org/rfcs/rfc2119.html]
> > meaning "absolute
> > requirement of the specification"
> >    
> >    Peter.
> >    
> >      
> >
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