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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.
WebSphere Commerce integration with WebSphere Portal
You can integrate WebSphere Commerce, a Business Application Service with WebSphere Portal, an Interaction Service. The Interaction Service provides core portal services (WebSphere Portal) that aggregate applications and content and deliver them as role-based applications. The Enterprise Service Bus (ESB) pattern is used for communication, mediation, transformation and integration with external systems. Using an ESB to integrate the Web services exposed from WebSphere Commerce to the WebSphere Portal promotes a loosely coupled design where the ESB manages the interactions styles between the WebSphere Commerce services and the presentation layer. You do not need to alter your presentation layer to support the protocol and format used by the WebSphere Commerce services. Instead, you rely on the ESB to perform tasks such as message transformation and protocol mediation. Neither WebSphere Commerce nor WebSphere Portal needs to change in order to communicate with one another. The ESB is used to act as an interpreter between the two systems and will translate the messages into a format the receiving system understands.
WebSphere Commerce Portal integration tracing and logging
Portlets can write message and trace information to log files, which are maintained in the WebSphere Portal server's log directory. The log files help the portal administrator investigate portlet errors and special conditions; they also help the portlet developer test and debug portlets.

WebSphere Commerce Portal integration tracing and logging

Portlets can write message and trace information to log files, which are maintained in the WebSphere Portal server's log directory. The log files help the portal administrator investigate portlet errors and special conditions; they also help the portlet developer test and debug portlets.

Procedure

To enable portlet tracing:
1. Log in to the portal as the portal administrator.
2. Select Administration > Portal Analysis > Enable Tracing. The Enable Tracing portlet appears.
3. In the Append these trace settings field, type the required trace string.
4. Click the Add icon. Using Enable Tracing, update the Current trace settings field.
  For example:
```
com.ibm.commerce.foundation.*=all
```
  Note: WebSphere Portal does not allow selective logging. When the logging is enabled on the WebSphere Portal server, all portlets deployed to that server are logged.
To disable portlet tracing:
1. Log in to the portal as the portal administrator.
2. Select Administration > Portal Analysis > Enable Tracing. The Enable Tracing portlet appears.
3. Under Current trace settings, select the current trace settings and click the Remove icon.