Let's say we have the following UC:

User can select a customer from a list for edit. He can change the customer detaiuls and press save to go back to the customer list.


Design posibility 1:
We make editCustomer action statefull (@Statefull). this action will have two methods:

@Begin
String showEdit() {
 ....
}

@End
String doEdit() {
 ....
}

Design posibility 2:
We make editCustomer action stateless (@Stateless) as in booking register action or Seam trailBlazer.

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Pros and cons ?