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User Guide
The information contained in this section applies to IBM WebSphere Commerce Version 7.0.0.9 and Feautre Pack 8. The documentation also applies to all subsequent releases and modifications until otherwise indicated in new editions.
Developing
The topics in the Developing section describe tasks performed by an application developer.
Presentation layer
WebSphere Commerce uses Java Server Pages (JSP) to implement the view layer of the Model-View-Controller (MVC) design pattern. The view layer is in charge of retrieving data from the database through the use of data beans and formatting it to meet the display requirements. The view layers determines whether the request is sent to a browser or streamed out as XML. JSP files present a clean separation between data content and presentation.
Customizing IBM Sales Center
In the IBM Sales Center for WebSphere Commerce there is a set of user interface panels, views and dialogs that contain the most commonly used features. You can add to or configure the user interface to suit your needs, as well as changing the content and format of the data that is passed between the client and the server.
Error handlers
The IBM Sales Center error handler extension point is the mechanism for defining a new error handler. Errors handlers are used to handle exception thrown by the service layer while performing a Service request.

Error handlers

The IBM Sales Center error handler extension point is the mechanism for defining a new error handler. Errors handlers are used to handle exception thrown by the service layer while performing a Service request.

When you define an error handler you can associate it with a service request definition for which the exception needs to be handled. The base service requests are associated with an error handler com.ibm.commerce.telesales.standardErrorHandler. This error handler handles some exception scenarios such as activity token expired exception, and so on.