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What is the difference between SOAP 1.1 and SOAP 1.2 factories in Axiom?

SOAP11Factory and SOAP12Factory both implement SOAPFactory, but each produces structures correct for its respective SOAP version - the two protocol versions differ enough in namespace and fault structure that using the wrong one produces messages real SOAP stacks will reject.

SOAP 1.1 (SOAP11Factory)SOAP 1.2 (SOAP12Factory)
Envelope ns: http://schemas.xmlsoap.org/soap/envelope/Envelope ns: http://www.w3.org/2003/05/soap-envelope
Fault uses faultcode / faultstring elementsFault uses structured Code / Reason elements
Header attribute: actorHeader attribute: role (plus additional relay semantics)

Choosing the correct factory isn't a stylistic preference - a SOAP 1.2 client sending an envelope built with SOAP11Factory (or vice versa) will typically be rejected outright by a compliant endpoint due to the mismatched envelope namespace, since that namespace is effectively the version identifier itself.

In practice, the factory used is usually determined by the binding configured for a given Axis2 service or client, rather than picked ad hoc - but understanding the structural differences matters for correctly interpreting or constructing SOAP faults by hand.

SOAP 1.1 faults are structured using:
Sending a SOAP 1.2 client an envelope built with SOAP11Factory typically results in:

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