FHIR Chat · Error in Subscription POST method

Stream: implementers

Topic: Error in Subscription POST method

Prasanth Vijayan (Mar 16 2021 at 14:00):

I am investigating on a method with FHIR to get notified when Observation resource field value changes, patient admit/discharge cases.

For observation, i created a subscription resource and tried a HTTP POST method. But that POST method failed with error:
{
"severity": "error",
"code": "processing",
"diagnostics": "Failed to call access method: java.lang.NullPointerException: The validated object is null"
}

The Subscription resource which i have used is enclosed below:
{
"resourceType": "Subscription",
"status": "active",
"end": "2050-01-01T00:00:00Z",
"reason": "Monitor the admit/discharge of patient",
"criteria": "Observation?status=final",

"channel": {
  "type": "rest-hook",
  "endpoint": "URL",
  "payload": "application/fhir+json",
  "header": [
  ]
}

}

Any help would be really appreciated.

Thanks,
Prasanth

Lloyd McKenzie (Mar 16 2021 at 14:02):

That sounds like a bug in the server. What server were you hitting?

Prasanth Vijayan (Mar 16 2021 at 14:12):

http://hapi.fhir.org/baseR5

Thanks!
Prasanth

Prasanth Vijayan (Mar 16 2021 at 14:25):

@Lloyd McKenzie I changed the server URL to http://hapi.fhir.org/baseR4. It does not have this issue.

Thanks,
Prasanth

Lloyd McKenzie (Mar 16 2021 at 14:46):

@James Agnew

James Agnew (Mar 16 2021 at 15:06):

That doesn't look like a valid R5 subscription, e.g. there is no "criteria" element in the R5 subscription model.

Note that R5 subscriptions are still a work in progress in HAPI, you have to use a contained resource for your Topic definition and not nearly all features are tested or working yet.

Last updated: Apr 12 2022 at 19:14 UTC

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FHIR Chat · Error in Subscription POST method · implementers