When I accessed this URL http://my.domain.com:9763/services/Test_DataService.SOAP12Endpoint, I received the message bellow:
This XML file does not appear to have any style information associated with it. The document tree is shown below.
<soapenv:Reason xmlns:soapenv="http://www.w3.org/2003/05/soap-envelope">
<soapenv:Text xml:lang="en-US">
The endpoint reference (EPR) for the Operation not found is /services/User_DataService.SOAP12Endpoint and the WSA Action = null. If this EPR was previously reachable, please contact the server administrator.
</soapenv:Text>
</soapenv:Reason>
I tested the WSO2 DSS 2.7 and 3 local and remote with Oracle RDS on Amazon (the same error on all cases).
What's happening?
It looks like you are accessing the service in a wrong way.
As you might know, WSO2 Data Services Server uses Axis2 services to expose your data service as a web service.
So, you should know how to invoke Web (Axis2) services from a client.
When you successfully create a data service, you should be able to see the relevant service in the services list. Then you can use the "Service Dashboard" to view the service's WSDL and manage QoS
Following error from Axis2 usually indicate that you are not invoking the web service properly.
The endpoint reference (EPR) for the Operation not found is /services/User_DataService.SOAP12Endpoint and the WSA Action = null. If this EPR was previously reachable, please contact the server administrator.
You should be able to test the service from in-built Try It feature from Service Dashboard. soapUI is also a great tool to test Web Services. You can just point the WSDL in soapUI and create a project. You can then manually invoke listed service operations under the soapUI project.
I hope this helps!