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Chain exceptions

rupika deval
Greenhorn

Joined: Jan 04, 2008
Posts: 6
Can anybody please tell me what exactly do the chained exceptions used for?
Mark Newton
Ranch Hand

Joined: Jan 31, 2006
Posts: 129
Sure - if you tell us what chained exceptions are...

You might want to read: ShowSomeEffort
[ February 05, 2008: Message edited by: David Payne ]
Joe Ess
Bartender

Joined: Oct 29, 2001
Posts: 8705
    
    6

Any non-trivial application is going to have many layers. Some layers may be concerned with the details of interacting with databases, web services, files and so on. Other layers will contain business logic and still others will render the GUI or offer other services.
When an exception occurs in one layer, it may be necessary to propagate that exception to another layer. Since a business logic layer won't know much about working with files/databases/sockets and we want to isolate that layer from the details, we may throw a custom exception (i.e. CustomerNotFoundException) that the business logic can understand and resolve.
However, we will still want to indicate the original cause of the CustomerNotFoundException for debugging purposes, so we create the custom exception with a reference to the original.
It is not unusual to get a chain of dozens of exceptions in J2EE applications because of all the layers in an application server.


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