Circular view path [error] while json output expected in springboot - spring-boot

Question

newbie to Springboot with gradle, I am creating a restful service which queries the db2 database and returns the result in json.
The desired output
{
resource: {
results: [
{
currencyCode: "JPY",
conversionRateToUSD: "0.010286580",
conversionRateFromUSD: "97.214040040",
startDate: "2011-01-01",
endDate: "2011-01-29"
}
]
}
}
The api i am trying to build is http://localhost:8080/apis/exchange-rates/referenceDate=2015-01-01&currencyCode=JPY
I have created the below controller class
#RestController
#Slf4j
#RequestMapping("/apis")
public class IndividualExchangeRateController {
#Autowired
private IndividualExchangeRateService individualExchangeRateService;
public IndividualExchangeRateController(IndividualExchangeRateService individualExchangeRateService) {
this.individualExchangeRateService = individualExchangeRateService;
}
#RequestMapping(value = "/exchange-rates", method = RequestMethod.GET)
#ResponseStatus(HttpStatus.OK)
public #ResponseBody IndividualResource getIndividual(#RequestParam("referenceDate") #DateTimeFormat(pattern = "YYYY-MM-DD")Date referenceDate,
#RequestParam(value = "currencyCode", required = false) String currencyCode){
try {
System.out.println("Inside Controller");
return individualExchangeRateService.getIndividualExchangeRate(referenceDate, currencyCode);
}
catch (HttpClientErrorException e){
throw new InvalidRequestException(e.getMessage());
}
}
}
I am getting the below error when i call the api
javax.servlet.ServletException: Circular view path [error]: would dispatch back to the current handler URL [/error] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.)
Can anybody help out on this ?
As the output is json i do not have thymeleaf dependencies on my application
Below is the gradle build file
plugins {
id 'org.springframework.boot' version '2.1.7.RELEASE'
id 'java'
}
apply plugin: 'io.spring.dependency-management'
group = 'com.abc.service'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'
repositories {
mavenCentral()
maven { url "http://artifactory.abcinc.dev/artifactory/maven-repos" }
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter-web'
testImplementation 'org.springframework.boot:spring-boot-starter-test'
compileOnly 'org.projectlombok:lombok:1.18.8'
annotationProcessor 'org.projectlombok:lombok:1.18.8'
runtime 'com.ibm.db2.jcc:db2jcc4:4.19.49'
compile group: 'org.springframework', name: 'spring-jdbc', version: '5.1.9.RELEASE'
compile group: 'com.zaxxer', name: 'HikariCP', version: '3.3.1'
compile group: 'com.fasterxml.jackson.core', name: 'jackson-core', version: '2.9.9'
}
public class IndividualExchangeRate {
private String currencyCode;
private double conversionRateFromUSD;
private double conversionRateToUSD;
}
public class IndividualResource {
private List<IndividualExchangeRate> individualExchangeRates;
}
All the classes are annotated with lombok.

Answer 1

Spring Boot uses a default Whitelabel error page in case server error.So there might be some code snippets which is breaking your appliaction flow.
Add server.error.whitelabel.enabled=false in your application.properties file .
OR add the following code snippets :
#Controller
public class AppErrorController implements ErrorController{
private static final String PATH = "/error";
#RequestMapping(value = PATH)
public String error() {
return "Error handling";
}
#Override
public String getErrorPath() {
return PATH;
}
}