Conditional PATCH returns NullPointerException

[renom]

Request: PATCH /fhir-server/api/v4/Patient?_id={existing_id}

Response:

{
    "resourceType": "OperationOutcome",
    "issue": [
        {
            "severity": "fatal",
            "code": "exception",
            "details": {
                "text": "NullPointerException: <null message>"
            }
        }
    ]
}

There's the same error when different filters are passed.

[lmsurpre]

I was able to reproduce it and captured the following stack trace:

[INFO]     java.lang.NullPointerException: Cannot invoke "com.ibm.fhir.model.resource.Resource.getId()" because "newResource" is null
[INFO] 	at com.ibm.fhir.server.util.FHIRRestHelper.doUpdateMeta(FHIRRestHelper.java:619)
[INFO] 	at com.ibm.fhir.server.util.FHIRRestHelper.doPatchOrUpdate(FHIRRestHelper.java:484)
[INFO] 	at com.ibm.fhir.server.util.FHIRRestHelper.doPatch(FHIRRestHelper.java:438)
[INFO] 	at com.ibm.fhir.server.resources.Patch.conditionalPatch(Patch.java:276)
...

[lmsurpre]

QA: test both JSONPatch and FHIRPathPatch and confirm no NPE

[PrasannaHegde1]

tried condition PATCH with both JSONPatch and FHIRPathPatch with below requests.
JSONPatch:
Request: PATCH /fhir-server/api/v4/Patient?name=Dave
Requesy body : [{ "op": "add", "path": "/gender", "value": "male" }]
Response : 200 OK. No null pointer exception observed.

FHIRPathPatch:
Request: PATCH /fhir-server/api/v4/Patient?name=Dave
Requesy body :

{
    "resourceType": "Parameters",
    "id": "test",
    "parameter": [
        {
            "name": "operation",
            "part": [
                {
                    "name": "type",
                    "valueCode": "replace"
                },
                {
                    "name": "path",
                    "valueString": "Patient.gender"
                },
                {
                    "name": "value",
                    "valueCode": "male"
                }
            ]
        }
    ]
}

Response : 200 OK. No null pointer exception observed.

This is working as expected.