OSB Error handling

Question

Hi,
Could you point me to some OSB error handling examples? I am trying to understand how to handle errors at OSB. We are planning to build a number of message flows into OSB and trying to figure out the best way to handle errors.
Thank you

Answer 1

Hi
From the main entry point of a proxy service you can create an error handler (as well as stages, routing nodes etc).
In the Error Handlers you get the BEA error code which is sometimes helpful and sometimes not.
For example, if I have a validate node in my main flow that cause an XML validation error, that is easy recognisable so an 'if then' node will be able to route to the appropriate error handling logic. If the proxy service calls another service which throws a SOAP fault back, things get a little trickier as all you get back from the container is a BEA-380001 error code - basically an 'Internal Server Error'. So to sort this out you need an 'if then' node to trap this error code and then include a nested 'if then' node to look for the real error. The nest if statement condition would look something like "$body/soap-env:Fault/detail/mf:MyFault/mf:MyFaultcode = ERROR_CODE". Notice here, the way to get the actual fault it to use XPath to traverse the actual message returned and not use the $fault variable provided by the container.
I also suggest you create your own Fault type in an xsd so that the OSB always returns a consistent fault format.
In each of the 'if then' condition branches in the error handler I have an assign which creates the SOAP fault using the user defined fault type, a sanitised example of which is shown below.
<soapenv:Body xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:gn="http://www.mycompany.com/wsdl/path/notification/1.0">
     <soapenv:Fault>
          <faultcode>gn:MyException</faultcode>
          <faultstring/>
          <detail>
          <fault:Fault xmlns:fault="http://www.mycompany.com/schema/fault/1.0">
               <fault:code>10000</fault:code>
               <fault:message>System Returned Error:
                    Details are:
                    Error Code - {fn:string($body/soap-env:Fault/detail/ser:ServiceException/ser:faultCode)}
                    Error Message - {fn:string($body/soap-env:Fault/detail/ser:ServiceException/ser:message)}
               </fault:message>
               <fault:processId>{fn:string($body/ns1:Type/ns2:id)}</fault:processId>
               <fault:shortMessage>system Returned Error</fault:shortMessage>
               <fault:time>{fn:current-dateTime()}</fault:time>               
          </fault:Fault>
          </detail>
     </soapenv:Fault>
</soapenv:Body>
Notice how my fault type is populated in the detail stanza of the overall SOAP fault message.
This XML just gets assigned to body.
the very last thing in the error handler is to add a reply node "with failure" if you wish to return a soap fault or "with success" if you have handled the error and don't need tot return a fault.
Hope this at least points you in the right direction.
Cheers
MAtt