#NotNull #NotBlank #Valid is not working in spring boot rest api validation - spring

Question

#NotNull, #NotEmpty, #NotBlank annotations are not working in my rest controller. My requirement is to restrict the flow at controller and get 400 error when i hit the controller without required parameters. But when i pass null or empty headers to my controller, i am not getting 400 error. my controller hits my handler class which is not the expected behaviour
Below is my controller
#RestController
#RequestMapping("/intelligent-banking")
public class CrossSellOffersRetrievalController {
#Autowired
private CrossSellOffersRetrievalHandler crossSellOffersRetrievalHandler;
#Autowired
Environment env;
#GetMapping(value = "/cross-sell-offers/{interactionPoint}", produces = { MediaType.APPLICATION_JSON_VALUE })
public ResponseEntity<CrossSellOffersRetrievalResponse> getApplicableOffers(
#RequestHeader(value = "channelId", required = true) #Valid String channelId,
#RequestHeader(value = "clientId", required = false) String clientId,
#RequestHeader(value = "actionId", required = true) #NotNull #NotEmpty String actionId,
#RequestHeader(value = "customerId", required = true) #NotNull #NotBlank String customerId,
#RequestHeader(value = "cinSuffix", required = true) #NotNull #NotBlank String cinSuffix,
#RequestHeader(value = "sessionId", required = true) #NotNull #NotBlank String sessionId,
#RequestHeader(value = "countryCode", required = true) #NotNull #NotBlank String countryCode,
#PathVariable(value = "interactionPoint", required = true) #NotNull #NotBlank String interactionPoint,
#RequestParam(value = "numberOfOffers", required = false) Integer numberOfOffers)
throws CrossSellOffersException {
try {
CrossSellOffersRetrievalResponse crossSellOffersResponse = crossSellOffersRetrievalHandler.getCrossSellOffersRetrievalResponse(channelId,
customerId, cinSuffix, countryCode, interactionPoint, sessionId, numberOfOffers);
HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.set("CustomerId", customerId);
return new ResponseEntity<>(crossSellOffersResponse, httpHeaders, HttpStatus.OK);
}
catch (Exception e) {
LOGGER.error("Inside CrossSellOffersRetrievalController::getApplicableOffers::Exception - Exception occurred at getApplicableOffers: {} ",e.getMessage());
throw new CrossSellOffersException(Constants.ERROR_CODE, e.getMessage());
}
}
}

Answer 1

You need to enable validation for both request parameters and path variables via adding #Validated annotation to your controller in order for validations to be executed.

Answer 2

Use this maven dependency inorder make those work
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
<version>2.3.2.RELEASE</version>
</dependency>

Answer 3

was using This dependency of validation in spring boot and didn't work ,due to version upgrade of spring boot to 2.4.0
<!-- https://mvnrepository.com/artifact/javax.validation/validation-api -->
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>2.0.1.Final</version>
</dependency>
Replaced it with spring-boot-starter-validation and it worked .
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-
starter-validation -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
<version>2.4.0</version>
</dependency>
**Need to enable validation for both request parameters and path variables via adding #Validated annotation to your controller in order for validations to be executed.**