In which case we are not advised to use Transformers...?

Answer Posted / aarthi srinivasachari

When exception occurs in a transformer, it swipes off the
pipeline values and 'lastError' will not have the service
stack too. So Transformer is not advised when there is a
possibility of exception from the service used as
transforner. Ex: addInts service, this would throw
exception when there is 'null' input. So if there is a
possibility that one value may be null, do not use
transformer for this value trnaformation.
Also addInts is a common service that can be invoked by
many services. When an exception is caused by addInts being
used as transformer - you can guess how tough it would be
to track down the service that failed with the exception.

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