how to Throw an exception from an #Async annotated method - spring-boot

Question

I have two modules, one calls the other from a rest template.
( admin calls notifServer)
the notifServer has a method annotated with #Async . I want to throw an exception in that method, but the admin gets the response too quickly and the exception method cannot be caught at admin.
I an new to spring and the #Async process. I've tried mapping the response body from the NotifServer to a CCompletableFuture.class .
But Still I get no error response.
This code is from admin
ResponseEntity response = fcmRestTemplate.exchange(nsUrl + "/fcm/admin/" + bulkFcmId, HttpMethod.POST,
HttpEntityUtils.getHttpEntity(moduleCode), CompletableFuture.class);
if (response.getStatusCode() != HttpStatus.CREATED && response.getStatusCode() != HttpStatus.ACCEPTED) {
String errorMessage = ErrorResourceUtil.getErrorMessage((HashMap) response.getBody(),"Unable to send fcm");
setStatusToFailedByBulkFcmId(bulkFcmId);
throw new ClientException(errorMessage);
}
now this is from NotifServer
JobExecution jobExecution = jobLauncher
.run(importJob, new JobParametersBuilder()
.addString("fullPathFileName", TMP_DIR)
.addString("batch_fcm_id", String.valueOf(id))
.addLong("time",System.currentTimeMillis())
.toJobParameters());
if(jobExecution.getStepExecutions().stream().map(StepExecution::getStatus).findFirst().get().equals(BatchStatus.ABANDONED)){
throw new ClientException("INVALID CSV");
This is annotated with #Async.
So is there a way for me to catch the client exception in the response body in the Admin?
EDIT
This is the API from notifServer
#ResponseStatus(HttpStatus.CREATED)
#PostMapping(value = "/admin/{bulkFcmId}")
public void pushFCMByAdmin(#PathVariable Long bulkFcmId) {
fcmService.sendFcmByAdmin(bulkFcmId, AuthUtil.getCurrentUser());
}
Then the sendFcmByAdmin has #Async annotation.

Answer 1

In below code can you provide the return type to be a business object rather than CompletableFuture.class.Since you are passing CompletableFuture.class as a parameter to the exchange it expects a response return value of the type CompletableFuture.class.
ResponseEntity response = fcmRestTemplate.exchange(nsUrl + "/fcm/admin/" + bulkFcmId, HttpMethod.POST,
HttpEntityUtils.getHttpEntity(moduleCode), CompletableFuture.class);
if (response.getStatusCode() != HttpStatus.CREATED && response.getStatusCode() != HttpStatus.ACCEPTED) {
String errorMessage = ErrorResourceUtil.getErrorMessage((HashMap) response.getBody(),"Unable to send fcm");
setStatusToFailedByBulkFcmId(bulkFcmId);
throw new ClientException(errorMessage);
}
Instead of passing Completable Future ,can you try creating it as follows:
Use an asynchronous method to make the rest template call in admin:
#Async
public CompletableFuture<List<BusinessObject>> getResponseAsynchronously(String value) {
String url = "https://restendpoint.eu/rest/v2/lang/" + value + "?fields=name";
BusinessObject[] response = restTemplate.getForObject(url, Country[].class);
return CompletableFuture.completedFuture(Arrays.asList(response));
}
then in the controller read the CompletableFuture like:
#GetMapping("")
public List<String> getAllDataFromRestCall() throws Throwable {
CompletableFuture<List<BusinessObject>> businessObjectsFuture = countryClient.getResponseAsynchronously("fr");
List<String> europeanFrenchSpeakingCountries;
try {
europeanFrenchSpeakingCountries = new ArrayList<>(businessObjectsFuture
.get()
.stream()
.map(Country::getName)
.collect(Collectors.toList()));
} catch (Throwable e) {
throw e.getCause();
}
return europeanFrenchSpeakingCountries;
}