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From Bharath Ganesh <>
Subject Re: Returning database SQL errors to the SOAP client
Date Mon, 09 Feb 2009 19:25:51 GMT
How about using one single wsdl:fault with the specific fault string and
detail set?

This would mean the client always gets a fault in case of failure. At the
same time -
- Keeps the application simple - Not too many faults
- For a new error on the server, the wsdl still remains same, client remains
- I don't see any performance benefit at the client side if it has specific

What do you think?

On Mon, Feb 9, 2009 at 12:22 PM, Glen Mazza <> wrote:

> Hello, I have a design question.  For a web service that handles standard
> database CRUD actions on a table, I was wondering about a good way to
> return
> error messages to the SOAP client based on standard database errors.
> For example, an "addWidget()" web service operation that adds a widget to
> the widgets table, multiple errors can occur:
> -- duplicate primary key
> -- unique key violation
> -- invalid value for a particular column
> -- foreign key not found
> One way to handle this would be to create a wsdl:fault for each type of
> error, which will get converted into a Java exception by wsdl2java.  Then,
> have the web service provider throw the appropriate Java exception on error
> and have the SOAP client trap that error.
> But I think the client would still want a response even on a successful
> insert of a widget (instead of a one-way "ping" type SOAP client call when
> making the addWidget request.)  A successful response would presumably just
> be a xsd:string with value of "OK".  But since I would then have to return
> a
> response anyway, fail or no fail, perhaps it would be better to avoid
> wsdl:faults for database exceptions and just place the error in the
> response
> message, say with "FAIL" replacing "OK" and a detail element giving the
> problem.
> So I see two solutions:
> 1.) Standard SOAP response of "OK" if the addWidget() succeeds, specific
> wsdl:fault exceptions if it does not
> 2.) Standard SOAP response of "OK" or "FAIL", with a detail element giving
> the problem if the latter; no wsdl:faults are defined or used.
> Any idea which is better--or other ideas?
> Thanks,
> Glen
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