Find and return the ExceptionConfig instance defining how Exceptions of the specified type should be handled. This is performed by checking local and then global configurations for the specified exception's class, and then looking up the superclass chain (again checking local and then global configurations). If no handler configuration can be found, return null.
Introduced in ActionMapping in Struts 1.1, but pushed up to ActionConfig in Struts 1.2.0.
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