Replace the default Phase4PeppolServletMessageProcessorSPI

[MakakWasTaken]

I am currently trying to send a message with an xml file as the attachment. The XML file has the element 'Nomination_Document' at the root. This causes some problems with the Phase4PeppolServletMessageProcessorSPI.

I have written a Custom handler for the SBD and added it to META-INF/services. It seems like this is not propegated properly, because I am getting the error:

2022-05-25 11:05:41.539 ERROR 13435 --- [nio-8080-exec-1] c.h.j.LoggingJAXBReadExceptionHandler    : Failed to parse XML document: cvc-elt.1.a: Cannot find the declaration of element 'Nomination_Document'.
2022-05-25 11:05:41.541 ERROR 13435 --- [nio-8080-exec-1] s.Phase4PeppolServletMessageProcessorSPI : [4e03cf71-e868-493a-9387-62cc92bf39c0@phase4] Peppol SBDH Issue: [fatal_error] @ (2:209) cvc-elt.1.a: Cannot find the declaration of element 'Nomination_Document'. (org.xml.sax.SAXParseException: cvc-elt.1.a: Cannot find the declaration of element 'Nomination_Document'.)
2022-05-25 11:05:41.543  WARN 13435 --- [nio-8080-exec-1] c.h.phase4.servlet.AS4RequestHandler     : Error invoking synchronous SPIs

Is it possible to replace the functionality in Phase4PeppolServletMessageProcessorSPI to allow for the custom element declaration?

[phax]

For the usage with ENTSOG you cannot use the phase4-peppol-servlet or phase4-peppol-server-webapp submodule, because it adds an additional "SPI layer" that enforces the usage of the "Standard Business Document Header" (SBDH).
To retrieve "arbitrary" AS4 messages, you need to implement the com.helger.phase4.servlet.spi.IAS4ServletMessageProcessorSPI SPI interface that is more generic. An example is shown in the generic phase4-server-webapp module.

[phax]

Yes, it is the other way around, because the file could contain multiple implementations

[piotr-dajlido]

Hi guys,

I'm sorry but I don't get it. I have created @service based on ExampleRecieveMessageProcessorSPI

 @IsSPIImplementation
@Service
public class ExampleReceiveMessageProcessorSPI implements IAS4ServletMessageProcessorSPI
{
  private static final Logger LOGGER = LoggerFactory.getLogger (ExampleReceiveMessageProcessorSPI.class);
...

Yet it is no being registered anywhere:

2024-07-10T08:36:41.682+02:00 WARN 34444 --- [nio-8080-exec-3] .p.s.m.AS4ServletMessageProcessorManager : No AS4 message processor is registered. All incoming messages will be discarded! 2024-07-10T08:36:41.683+02:00 ERROR 34444 --- [nio-8080-exec-3] c.h.phase4.servlet.AS4RequestHandler : No IAS4ServletMessageProcessorSPI is available to process an incoming message

From your discusson I assume that it should be picked up from registered beans. So how to provide impl of IAS4ServletMessageProcessorSPI?

Same goes for manual registration:

[MakakWasTaken]

Can you confirm that you have a file in your resources folder with the following naming?

It needs to be named exactly: com.helger.phase4.servlet.spi.IAS4ServletMessageProcessorSPI otherwise the service is not going to pick it up, which was the error I had above.

Also the content of your file should be something along with:
com.project.ExampleReceiveMessageProcessorSPI
Essentially describing the path of the class. This needs to be exact otherwise the message processor is not going to be picked up.

[piotr-dajlido]

Thank you for your reply, I have never encountered such pattern. Not happy with it, but will do. Thank you @MakakWasTaken

[phax]

@piotr-dajlido this is called SPI (Service Provider Interface) and is described at https://docs.oracle.com/javase/tutorial/sound/SPI-intro.html - it's not a Spring thing, but a Java thing :)