The onRetryProcessException method receives control
when a retryable exception is thrown from an ItemProcessor
processItem method. This method receives the exception and the item
being processed as inputs. This method receives control in same
checkpoint scope as the ItemProcessor. If this method
throws a an exception, the job ends in the FAILED state.
item - specifies the item passed to the ItemProcessor.
ex - specifies the exception thrown by the ItemProcessor.