Prevalence and Web Applications

Hi,

I've a question how people use Prevalence or prevayler in web 
applications. Here is a simple scenario and then the question where my 
problem is:

A simple multi user application to edit a shared data pool, e.g. a 
customer management system where users can search for customers and then 
edit single objects in a multi page form.

How do you handle modifications to customer objects in the UI part of 
the web application? Your typical Java web framework binds the UI fields 
to your object and updates it continuously (e.g. via ajax requests) 
until the user saves the changes and persists the object.

The way I see it, it is not possible to do this with prevalence, i.e. I 
cannot use the object I received from a query for a customer in the UI 
because any changes would be saved in a snapshot since it is the same 
instance. I either have to create a copy of the persisted object or have 
a different set of objects for my UI. Both solutions seem like a 
workaround to me.

When solving this with classical ORM persistance, e.g. Hibernate and a 
database, its easy to use the same objects and don't worry about 
modifications until an explicit commit on the transaction.

How do you solve this with web applications using prevalence?

Thanks & ciao,
elm

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