Why objectmapper writevalueasstring return empty string?

I need to serialize Java Object to JSON, but when i use writevalueasstring method this method returns me empty json object. Here is my rest controller

 public String getReportsFromReporter(@PathVariable(name = "from")String from, 
  @PathVariable(name = "to")String to) throws IOException {
    String url = "example.com";
    ObjectMapper objectMapper = new ObjectMapper();
    ObjectForRequestToReporter objectForRequestToReporter =
            new ObjectForRequestToReporter();
    objectForRequestToReporter.setToken(somedata);
    objectForRequestToReporter.setEmployee(somedata);
    objectForRequestToReporter.setFrom(from);
    objectForRequestToReporter.setTo(to);
    String jsonObject = objectMapper.writeValueAsString(objectMapper);
    HttpHeaders httpHeaders = new HttpHeaders();
    httpHeaders.setContentType(MediaType.APPLICATION_JSON);
    httpHeaders.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));
    HttpEntity<String> entity = new HttpEntity<String>(jsonObject, httpHeaders);
    String ans = restTemplate.postForObject(url , entity, String.class);
    String test = objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(objectMapper);
    System.out.println(test);
    System.out.println(jsonObject);
    return ans;

System.out.println shows this

 { }
 {}

Gradle depedencies

implementation("com.fasterxml.jackson.core:jackson-annotations:2.14.2")
implementation("com.fasterxml.jackson.core:jackson-core:2.14.2")
implementation("com.fasterxml.jackson.core:jackson-databind:2.14.2")

Object class for serialize

 @Data
 public class ObjectForRequestToReporter {

private String token;
private String employee;
private String from;
private String to;
private final int work_after = 0;
}

What i`m doing wrong?How i can fix this?

>Solution :

I think you have a mistake in this line:

String jsonObject = objectMapper.writeValueAsString(objectMapper);

Maybe it should be:

String jsonObject = objectMapper.writeValueAsString(objectForRequestToReporter);