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From David Peterson <>
Subject Stateful Web Services
Date Tue, 14 Jan 2003 22:25:03 GMT

Hi All,

I have a bit of a newbie question in relation to web services:

Do SOAP-based web services support the concept of state and persistence? 
That is, can I easily create a web service where state is preserved 
between invocations?

For example, can I create a "bank account" web service, which supports 
deposit(), withdrawl() and getBalance() operations, and have that web 
service preserve the current account balance between separate invocations?

I imagine that I could achieve this with web services by using an 
external persistence component, eg an EJB, or a JDBC call to a database. 
What I want to know is whether I can preserve state internally (inside a 
web service component) by simply declaring an instance variable 
appopriately (e.g. "static" - though this might not be the right approach).

On the other hand, is my only "stateful web service" option to use an 
external persistence layer (JDBC or EJB?)


David Peterson

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