Section 3: Integrate Microservices

Integration with other DIGIT services
A separate class should be created for integrating with each dependent microservice. Only one method from that class should be called from the main service class for integration.
In this guide, we will be showcasing how we can integrate our microservices with other microservices like MDMS, IdGen, User and Workflow.
Code for developer guide till this stage is available here. Postman collection corresponding to this stage is available here.
For interacting with other microservices, we can create and implement the following ServiceRequestRepository class under repository package -
package digit.repository;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import lombok.extern.slf4j.Slf4j;
import org.egov.tracer.model.ServiceCallException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.web.client.HttpClientErrorException;
import org.springframework.web.client.RestTemplate;
import java.util.Map;
public class ServiceRequestRepository {
private ObjectMapper mapper;
private RestTemplate restTemplate;
public ServiceRequestRepository(ObjectMapper mapper, RestTemplate restTemplate) {
this.mapper = mapper;
this.restTemplate = restTemplate;
public Object fetchResult(StringBuilder uri, Object request) {
mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
Object response = null;
try {
response = restTemplate.postForObject(uri.toString(), request, Map.class);
}catch(HttpClientErrorException e) {
log.error("External Service threw an Exception: ",e);
throw new ServiceCallException(e.getResponseBodyAsString());
}catch(Exception e) {
log.error("Exception while fetching from searcher: ",e);
return response;
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