Trying to Send list of string in post request using webClient in spring

Question

• I am trying to send a list of strings using webClient but I am getting an exception.

• I used Flux.fromIterable(strList) but it merged all the data before sending, because of that instead of a list of strings I received combined single string on mapping class.

   List<String> str = new ArrayList<>();
               str.add("korba");
               str.add("raipur");
               str.add("bhilai");
  
     Flux<Object> responsePost = webClient.build()
                        .post()
                        .uri(url)
                        .header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
                        .body(Flux.fromIterable(str), String.class)
                        .retrieve()
                        .bodyToFlux(Object.class);
  

Answer 1

You cannot send a Flux of strings because it combines them into a single string. See,

WebClient bodyToFlux(String.class) for string list doesn't separate individual value

You are creating a Flux of strings at Flux.fromIterable(str). What you need to do is put the string into a wrapper class or send a Mono of a list. See, e.g., Reactive Programming: Spring WebFlux: How to build a chain of micro-service calls?