CODEWITHSUNDEEP
javaspring-bootjacksonhl7-fhirhapi-fhir
Sandip Pawar
Sandip Pawar

Reputation: 675

Accepting FHIR Resource 'Patient' as a RequestBody in spring boot

I want to accept the JSON body of Patient FHIR resource as @RequestBody in Spring boot API. I tried to do this:

@RestController
@RequestMapping("/api")
public class DemoController {

    @PostMapping("/Patient/save")
    public String savePatientDetails(@RequestBody Patient p) {
        IGenericClient client = fhirContext.newRestfulGenericClient("http://localhost:8080/fhir");
        MethodOutcome s = client.create().resource(p).prettyPrint()
                .encodedJson()
                .execute();
        return s.toString();
    }
}

Using the Patient model from HAPI FHIR(https://hapifhir.io/hapi-fhir/apidocs/hapi-fhir-structures-r4/org/hl7/fhir/r4/model/Patient.html)

And called the above endpoint using postman with below request body:

{
    "resourceType":"Patient",
    "name": [{
        "use": "official",
        "given": ["temp"],
        "family": "temp"
    }],
    "birthDate": "1996-04-07"
}

but its giving below Jackson deserialization error:

[nio-8081-exec-1] .c.j.MappingJackson2HttpMessageConverter : Failed to evaluate Jackson deserialization for type [[simple type, class org.hl7.fhir.r4.model.Patient]]: com.fasterxml.jackson.databind.JsonMappingException: Conflicting setter definitions for property "referenceElement": org.hl7.fhir.r4.model.Reference#setReferenceElement(1 params) vs org.hl7.fhir.r4.model.Reference#setReferenceElement(1 params)
2022-02-25 09:32:43.332  WARN 71185 --- [nio-8081-exec-1] .c.j.MappingJackson2HttpMessageConverter : Failed to evaluate Jackson deserialization for type [[simple type, class org.hl7.fhir.r4.model.Patient]]: com.fasterxml.jackson.databind.JsonMappingException: Conflicting setter definitions for property "referenceElement": org.hl7.fhir.r4.model.Reference#setReferenceElement(1 params) vs org.hl7.fhir.r4.model.Reference#setReferenceElement(1 params)
2022-02-25 09:32:43.356  WARN 71185 --- [nio-8081-exec-1] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=UTF-8' not supported]

Thanks in advance.

Upvotes: 2

Views: 3028

Answers (3)

veritas
veritas

Reputation: 432

The solution of @Andrew Hall worked for me. I had to vary it because instead of a controller, I was using sending a FHIR R4 Patient resource object to from my proprietary app code to a FHIR server using RestTemplate.

I did what Andrew Hall's solution points to except that instead of registering the HapiMessageConverter to a MvcConfigurer, I had to register them to a Rest Template. Fleshing out the code here for others who come across this variation.

 @Bean(name = "intAppFhirRestClient")
public RestTemplate fhirRestTemplate() {
    RestTemplate restTemplate = new RestTemplate();
    restTemplate.getMessageConverters().add(0,new HapiHttpMessageConverter(FhirContext.forR4()));
    return restTemplate;
}

Also, registering the converter will only work if you have FhirContext and R4 in your proprietary code dependencies.

<dependency>
            <groupId>ca.uhn.hapi.fhir</groupId>
            <artifactId>hapi-fhir-structures-r4</artifactId>
            <version>5.5.7</version>
        </dependency>
        <dependency>
            <groupId>ca.uhn.hapi.fhir</groupId>
            <artifactId>hapi-fhir-base</artifactId>
            <version>5.5.7</version>
        </dependency>

Upvotes: 1

Andrew Hall
Andrew Hall

Reputation: 183

A slight variation on the second solution. You can create a custom Spring MessageConverter to serialize/deserialize FHIR. To do that:

  1. Create a HapiHttpMessageConverter to serialize/deserialize FHIR Resources
  2. Create a HapiMessageConverterConfigurer to register the converter
  3. Register the HapiMessgeConverterConfigurer with the Application Context

Upvotes: 2

jaideep pahwa
jaideep pahwa

Reputation: 26

SpringBoot does not natively understand the FHIR objects. Any time you will try to accept FHIR in the RequestBody Jackson will try to deserialize the FHIR object and throws the given error.

Solutions:

  1. Send the FHIR object as a raw object(String) and deserialize the same using HAPI FHIR to deserialize the string.

@RestController
@RequestMapping("/api")
public class DemoController {

    @PostMapping("/Patient/save")
    public String savePatientDetails(@RequestBody String p) {
        IGenericClient client = fhirContext.newRestfulGenericClient("http://localhost:8080/fhir");
        
        IParser parser = fhirContext.newJsonParser();
        
          Patient firObject=parser.parseResource(Patient.class,p);
    
        MethodOutcome s = client.create().resource(firObject).prettyPrint()
                .encodedJson()
                .execute();
                
        return s.toString();
    }
}

  1. Creating the customer serializer & deserializer using HAPI FHIR overriding the Jackson

Custom Deserilizer

Custom Serilizer

Registering custom Serializer and Deserializer

Upvotes: 1

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