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Explain Struts Workflow ?

A request comes in from a Java Server Page into the ActionServlet.

The ActionServlet having already read the struts-config.xml file, knows which form bean  relates to this JSP, and delegates work to the validate method of that form bean.

The form bean performs the validate method to determine if all required fields have been entered, and performs whatever other types of field validations that need to be performed.

If any required field has not been entered, or any field does not pass validation, the form bean generates ActionErrors, and after checking all fields returns back to the ActionServlet.

The ActionServlet checks the ActionErrors that were returned from the form bean’s validate method to determine if any errors have occurred. If errors have occurred, it returns to the originating JSP displaying the appropriate errors.

If no errors occurred in the validate method of the form bean, the ActionServlet passes control to the appropriate Action class.

The Action class performs any necessary business logic, and then forwards to the next appropriate action (probablyanother JSP).

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