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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