We have a requirement to host web services over HTTP and JMS and have had success with Spring-WS in the past. A new requirement is to provide pluggable logic to back the various web services. The idea is to consume an external WSDL and hosts its services. My current prototype has a single WS endpoint that accepts/returns DOM objects. I've got the various logic plugins described in terms of Spring Integration and have the endpoint selecting the proper channel needed to route the DOM over to the correct logic plugin (message target). I've even got JAXB transformations happening via a channel interceptor for those plugins that don't wish to work with DOM. The only problem I'm having is getting exceptions that happen in the SI world to return back to the Spring-WS endpoint so that it can be converted into a SOAP fault and returned to the WS caller. Based on experimentation and watching the SI code in the debugger, SI wants to route exceptions to an error channel where you can log things, retry, etc. I've even tried writing a custom ErrorHandler that squirreled away the exception thrown in the logic object into a thread-local that the WS endpoint could examine but that fails because the WS endpoint is not guaranteed to be running on the same thread that the SI message target is. Does anybody have any ideas on what I can try to get an exception thrown from an SI message destination back to the Spring-WS endpoint? My perfect solution allows for both the propagation back to the Spring-WS endpoint as well to the error channel. That way I can use the error channel for auditing purposes and still let the WS caller know that something bad happened during his service invocation.
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