After hitting Postman API Getting Params empty value as empty in controller by using webflex-CodePudding

find postman snapshot Below is my controller i'm using @WebfluxService Want to pass key value pair request from the postman while debugging i'm getting empty Value for params

below logger printing null value in my consol.

@PostMapping(value = "/bserviceobligation",consumes = { "application/x-www-form-urlencoded" })
public Mono<SyncBatchResponse> handleSyncBatch(@Valid @RequestParam Map<String, String> params,
        @RequestHeader(value = HEADER_APPLICATION_KEY, required = true) String appKey,
        @RequestHeader(value = HEADER_APPLICATION_ID, required = true) String appId,
        @RequestHeader(value = CORRELATION_ID, required = false) String correlationId) {
    LogHelper.info(this,"Calling SyncBatch for correlationId : " correlationId);
    LogHelper.info(this,"Requested Value1 ("   params.get("Value1")   ')');
    LogHelper.info(this,"Requested Value0 ("   params.get("Value0")   ')');
    LogHelper.info(this,"Requested Value ("   params.size()   ')');
    String unitOfWorkId = null;

    if (correlationId != null && !correlationId.equalsIgnoreCase("")) {         
        if(correlationId.contains(",")){
            correlationId = correlationId.substring(1,correlationId.length());
        }           
        unitOfWorkId = correlationId;
    }else
        unitOfWorkId = UUID.randomUUID().toString();

    LogHelper.info(this,"unitOfWorkId: "   unitOfWorkId);
    boolean isValid = ldapService.checkAuthorization(appId, groupSBSOBLIGATIONHPIACCESS0);
    if (isValid) {
        LogHelper.info(this,"Application authorization against: Enterprise Directory (SUCCESS) ("   appId   ')');
        SyncBatchResponse response = syncService.prepareCombineOrchaRequest(params, appId,appKey, unitOfWorkId);
 return Mono.just(response);
    } else {
        LogHelper.info(this,"Application authorization against: Enterprise Directory (FAILURE) ("   appId   ')');
        SyncBatchResponse response = new SyncBatchResponse();
        response.setStatusCode(LDAP_STATUS_CODE);
        response.setStatusDescription(LDAP_STATUS_DESCRIPTION);
        return Mono.just(response);
    }
}

CodePudding user response：

For recent releases of WebFlux, @RequestParam does not bind the form-data or Key Value pair. In this case use ServerWebExchange instead.

For Minimal Example:

    @PostMapping(value = "/api/query/ask", consumes = {"application/x-www-form-urlencoded"})
    public Mono<String> handleSyncBatch(ServerWebExchange serverWebExchange) {
        return serverWebExchange.getFormData()
                .flatMap(data -> response(data));
    }

    private Mono<? extends String> response(MultiValueMap<String, String> data) {
        log.info("{}", data);
        return Mono.just("Success");
    }

This logs the key value pair sent from postman. The sample cURL:

curl --location --request POST 'http://localhost:10120/api/query/ask' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data-urlencode 'val1=asdafasdfasfd' \
--data-urlencode 'val2=["something","som1"]' \
--data-urlencode 'val3={"name":"abc"}' \
--data-urlencode 'val4=[{"name":"xc"},{"age":23}]'

More study: https://github.com/spring-projects/spring-framework/issues/20738