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Do Wrap-up the exception From the bottom to top, if the code throws all the exceptions as it is, the top level must handle or know about too many exceptions, so must wrapper the exceptions, log down it and pass to the above layer.
For example, if DAO layer got some exception like SQLExcpetion, the end user or UI not necessarily say what is the error, instead this code wrap up as System Exception and pass it to the above layer, even though wrap that to system exception it should be logged down properly in the log files as SQLException, otherwise developer or operation people get confused about the exceptions.
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