ClassCastException during snomed CodeSystem $lookup with RemoteTerminology server as Snowstorm Terminology Server

[centaurusgod]

Issue probably linked to: #5699

Performing CodeSystem $lookup on remote terminology server set as https://tx.fhir.org/r4/ is fine but using snowstorm as terminology server results in this error.

curl --request GET \
  --url 'http://localhost:8080/fhir/CodeSystem/$lookup?system=http%3A%2F%2Fsnomed.info%2Fsct&code=134006&_format=json' \
  --header 'Content-Type: application/fhir+json'

[jkiddo]

What does your configuration look like?

[centaurusgod]

@jkiddo
Thanks for replying.
The configuration was:

    remote_terminology_service:
     snomed:
       system: 'http://snomed.info/sct'
       url: 'https://fhir.our_domain.org/r4/'

https://fhir.our_domain.org/r4/ this is the base url where we have hosted our snowstorm terminology server.

[jkiddo]

How does the CodeSystem look like, that you are trying to look up?

[centaurusgod]

It's the SNOMED CT that we uploaded and we expect the response for this request
CodeSystem/$lookup?system=http%3A%2F%2Fsnomed.info%2Fsct&code=134006&_format=json
to be

{
  "resourceType": "Parameters",
  "parameter": [ {
    "name": "name",
    "valueString": "SNOMED CT"
  }, {
    "name": "display",
    "valueString": "Decreased hair growth (finding)"
  }, {
    "name": "abstract",
    "valueBoolean": false
  } ]
}

[centaurusgod]

The request works when the remote terminology is kept either hapi-fhir server url itself, or tx.fhir.org/r4/, but it doesn't work with snowstorm.
Sending the request url mentioned above directly on our snowstorm server returns the response properly, but changing remote terminology server to same snowstorm base url in hapi-fhir results in ClassCastException

[jkiddo]

I can confirm its an issue using e.g. the following configuration

    remote_terminology_service:
      snostorm:
        system: '*'
        url: 'https://browser.ihtsdotools.org/fhir'

-and issuing the following request: http://localhost:8080/fhir/CodeSystem/$lookup?system=http://snomed.info/sct&code=427623005 afterwards.

It fails at https://github.com/hapifhir/hapi-fhir/blob/93cb7160a54d374f9baa4341fca13138f6043cec/hapi-fhir-validation/src/main/java/org/hl7/fhir/common/hapi/validation/support/RemoteTerminologyServiceValidationSupport.java#L446

Its an issue you need to raise at https://github.com/hapifhir/hapi-fhir

[jkiddo]

For clarity - snostorm responds with

{"resourceType":"Parameters","parameter":[{"name":"code","valueString":"427623005"},{"name":"name","valueString":"International Edition"},{"name":"system","valueString":"http://snomed.info/sct"},{"name":"version","valueString":"http://snomed.info/sct/900000000000207008/version/20250801"},{"name":"inactive","valueBoolean":false},{"name":"property","part":[{"name":"code","valueString":"effectiveTime"},{"name":"valueString","valueString":"20231001"}]},{"name":"property","part":[{"name":"code","valueString":"moduleId"},{"name":"value","valueCode":"900000000000207008"}]},{"extension":[{"url":"http://snomed.info/fhir/StructureDefinition/designation-use-context","extension":[{"url":"context","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000509007"}},{"url":"role","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000548007","display":"PREFERRED"}},{"url":"type","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000013009","display":"Synonym"}}]},{"url":"http://snomed.info/fhir/StructureDefinition/designation-use-context","extension":[{"url":"context","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000508004"}},{"url":"role","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000548007","display":"PREFERRED"}},{"url":"type","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000013009","display":"Synonym"}}]}],"name":"designation","part":[{"name":"language","valueCode":"en"},{"name":"use","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000013009","display":"Synonym"}},{"name":"value","valueString":"Obstetric umbilical artery Doppler"}]},{"extension":[{"url":"http://snomed.info/fhir/StructureDefinition/designation-use-context","extension":[{"url":"context","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000509007"}},{"url":"role","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000548007","display":"PREFERRED"}},{"url":"type","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000003001","display":"Fully specified name"}}]},{"url":"http://snomed.info/fhir/StructureDefinition/designation-use-context","extension":[{"url":"context","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000508004"}},{"url":"role","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000548007","display":"PREFERRED"}},{"url":"type","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000003001","display":"Fully specified name"}}]}],"name":"designation","part":[{"name":"language","valueCode":"en"},{"name":"use","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000003001","display":"Fully specified name"}},{"name":"value","valueString":"Obstetric umbilical artery Doppler (procedure)"}]},{"extension":[{"url":"http://snomed.info/fhir/StructureDefinition/designation-use-context","extension":[{"url":"context","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000509007"}},{"url":"role","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000549004","display":"ACCEPTABLE"}},{"url":"type","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000013009","display":"Synonym"}}]},{"url":"http://snomed.info/fhir/StructureDefinition/designation-use-context","extension":[{"url":"context","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000508004"}},{"url":"role","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000549004","display":"ACCEPTABLE"}},{"url":"type","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000013009","display":"Synonym"}}]}],"name":"designation","part":[{"name":"language","valueCode":"en"},{"name":"use","valueCoding":{"system":"http://snomed.info/sct","code":"900000000000013009","display":"Synonym"}},{"name":"value","valueString":"Doppler ultrasound scan of umbilical artery"}]},{"name":"property","part":[{"name":"code","valueString":"parent"},{"name":"value","valueCode":"709979004"}]},{"name":"property","part":[{"name":"code","valueString":"parent"},{"name":"value","valueCode":"710341000"}]},{"name":"property","part":[{"name":"code","valueString":"parent"},{"name":"value","valueCode":"418090003"}]},{"name":"property","part":[{"name":"code","valueString":"parent"},{"name":"value","valueCode":"118811002"}]},{"name":"property","part":[{"name":"code","valueString":"parent"},{"name":"value","valueCode":"432853001"}]},{"name":"property","part":[{"name":"code","valueString":"parent"},{"name":"value","valueCode":"238247000"}]}]}

when the following query is issued: https://browser.ihtsdotools.org/fhir/CodeSystem/$lookup?system=http://snomed.info/sct&code=427623005

[jkiddo]

@centaurusgod if you create the issue at https://github.com/hapifhir/hapi-fhir please link it to here