Error Handling in SAP Web Dispatcher 

You can configure the SAP Web Dispatcher to handle errors or special situations.

The same procedure is used as with Error Handling Using the ICM.

In addition to the error codes described there, the error code ICMEDISPATCHERR is used in the SAP Web Dispatcher. This code is for errors that occur when dispatching requests (for example, if no J2EE-enabled application server can be found for a J2EE request).

Parameter icm/HTTP/error_templ_pathspecifies the location of the error pages.

To handle any errors occurring while dispatching requests, create a file ICMERR-EDISPATCHERR.{html,shtml} in the directory specified by parameter icm/HTTP/error_templ_path.

You can find an example of a dynamic error page in Examples of a Dynamic Error Page.

Maintenance Mode

When you shut down the application server for maintenance (upgrade, backup and so on), an informative page explaining why it is not available should be displayed to the Internet user, and not simply the message, "page cannot be displayed". For this the Web dispatcher provides the maintenance mode that displays the maintenance page. You can set this page up to display the reason why the application server is not available and when it will be available again.

The file for the maintenance page must be called ICMERR-EMAINTENANCE.

The list of all the error codes as well as a description about working with your own error pages can be found in ICM Error Handling.