Failure connecting to S/4 Hana via Cloud SDK - s4sdk

Question

I'm following the OData tutorial at https://blogs.sap.com/2017/05/21/step-4-with-sap-s4hana-cloud-sdk-calling-an-odata-service/comment-page-1/ and I'm getting an error when I try to retrieve business partners using DefaultBusinessPartnerService.
The relevant piece of code is:
DefaultBusinessPartnerService businessPartnerService = new DefaultBusinessPartnerService();
System.err.println("criated default business partner");
List<BusinessPartner> partners = businessPartnerService
.getAllBusinessPartner()
.select(BusinessPartner.BUSINESS_PARTNER,
BusinessPartner.LAST_NAME,
BusinessPartner.FIRST_NAME)
//.filter(BusinessPartner.BUSINESS_PARTNER_CATEGORY.eq(CATEGORY_VENDOR))
.orderBy(BusinessPartner.LAST_NAME, Order.ASC)
.execute(new ErpEndpoint(new ErpConfigContext()));
response.setContentType("application/json");
response.getWriter().write(new Gson().toJson(partners));
My ErpQueryEndpoint configuration is as follows:
#Mon May 14 15:27:09 BRT 2018
URL=https\://host\:port
Name=ErpQueryEndpoint
TrustAll=TRUE
Type=HTTP
Password=Password
Authentication=BasicAuthentication
User=Username
Where host, port, Username and Password have been replaced by the correct values.
When I query http://localhost:8080/s4integration-application/businesspartners I get the following error:
The endpoint responded with HTTP error code 403.
No service found for namespace , name API_BUSINESS_PARTNER, version 0001
Full error message:
{
"error": {
"code": "/IWFND/MED/170",
"message": {
"lang": "en",
"value": "No service found for namespace , name API_BUSINESS_PARTNER, version 0001"
},
"innererror": {
"application": {
"component_id": "",
"service_namespace": "/SAP/",
"service_id": "API_BUSINESS_PARTNER",
"service_version": "0001"
},
"transactionid": "C83CB3D2A1420000E005AF97B0836AD5",
"timestamp": "20180514182746.3576100",
"Error_Resolution": {
"SAP_Transaction": "Run transaction /IWFND/ERROR_LOG on SAP Gateway hub system (System Alias ) and search for entries with the timestamp above for more details",
"SAP_Note": "See SAP Note 1797736 for error analysis (https://service.sap.com/sap/support/notes/1797736)"
},
"errordetails": []
}
}
}
It seems that the endpoint is not configured on the SAP system (it's an S/4 Hana system). I'm not sure if I have to add something else to the URL besides the host and port or if there is some other configuration that has to be done on the SAP system.

Answer 1

Instructions for activating OData APIs from the SAP S/4HANA backend can be found here: help.sap.com/viewer/cdc25c83b63e482586b31b8acd49cf2f/1610%20003/… Just ignore the notion of the Fiori app.