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Exceptions are a fact of life. As developers, we need to be prepared to deal with them in the most graceful manner possible. Seam Catch provides a simple, yet robust foundation for modules and/or applications to establish a customized exception handling process. By employing a delegation model, Catch allows exceptions to be addressed in a centralized, extensible and uniform manner.
Catch is first notified of an exception to be handled via a CDI event. This event is fired either by the application or a Catch integration. Catch then hands the exception off to a chain of registered handlers, which deal with the exception appropriately. The use of CDI events to connect exceptions to handlers makes this strategy of exception handling non-invasive and minimally coupled to Catch's infrastructure.
The exception handling process remains mostly transparent to the developer. In some cases, you register an exception handler simply by annotating a handler method. Alternatively, you can handle an exception programmatically, just as you would observe an event in CDI.
In this guide, we'll explore the various options you have for handling exceptions using Catch, as well as how framework authors can offer Catch integration.