Ajax POST request parameters in Spring Boot

Controller code

@PostMapping("/activityRest/addNew")
public Activity addNew(@RequestParam("unitName") String unitName,
                       @RequestParam("categoryName") String categoryName, @RequestParam("activity") String activity) {

    Activity newActivity = new Activity();
    String currentUser = CurrentUser.getName();
    newActivity.setUserName(currentUser);
    newActivity.setUnitName(unitName);
    newActivity.setCategoryName(categoryName);
    newActivity.setActivity(activity);
    activityRepository.save(newActivity);
    return newActivity;
}

Java Script code

$.ajax({
       type: "POST",
       url: "/activityRest/addNew",
       data: { unitName: $("#unitName").val(), categoryName: catName, activity: "Viewed" } // parameters
  })