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From "Hubert, Eric" <Eric.Hub...@foxmobile.com>
Subject Creating HessianFaults using FaultMediator/HessianMessageFormatter
Date Sat, 14 Mar 2009 18:13:33 GMT
Hi all,

if someone wants to use the FaultMediator in conjunction with Hessian messages he has to know
that he to set the HTTP status code to 200, after using the FaultMediator and before using
the SendMediator.

Normally (for SOAP messages) the HTTP status code is 500, but Ruwan once created a possibility
to override this value using a property of scope Axis2.

So declaratively this is possible in synapse.xml via adding the following configuration block:

<syn:switch source="get-property('transport', 'Content-Type')">
  <syn:case regex="x-application/hessian">
     <syn:property name="HTTP_SC" value="200" scope="axis2"/>
  </syn:case>
</syn:switch>

The HessianFormatter transforms the SOAPFault to a Hessian fault and writes a valid Hessian
fault message to the client, which deserializes the fault message to a HessianServiceException
with the proper message.
This only works if the HTTP status code is 200. Any other messages will not be deserialized
by the Hessian Client libraries.

I guess most people trying out the Hessian support would stumple over this issue. I see two
possibilities and would like to here your opinion.

a) Document this behaviour and the needed configuration online.
b) Extend the FaultMediator to set this property programmatically depending on the content-type
header.

I see advantages and disadvantages with both approaches. Currently the FaultMediator is already
handling the differences between SOAP 1.1, SOAP 1.2 and POX. This would need three of four
more lines as well as the duplication or a move of a content-type constant for "x-application/hessian"
as for sure a dependency from the core to the extensions module must not exist.

Anyone having a clever option c in mind? Comments are welcome!

Regards,
  Eric
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