docs: @Deprecated
    public void startTask(String taskId, String callbackUrl) {
      if (taskId==null || callbackUrl == null) {
        if (FacesContext.getCurrentInstance().isPostback()) {
          // if this is an AJAX request ignore it, since we will receive multiple calls to this bean if it is added
          // as preRenderView event
          // see http://stackoverflow.com/questions/2830834/jsf-fevent-prerenderview-is-triggered-by-fajax-calls-and-partial-renders-some
          return;
        }
        // return it anyway but log an info message
        log.log(Level.INFO, "Called startTask method without proper parameter (taskId='"+taskId+"'; callbackUrl='"+callbackUrl+"') even if it seems we are not called by an AJAX Postback. Are you using the camundaTaskForm bean correctly?");
        return;
      }
      // Note that we always run in a conversation
      this.url = callbackUrl;
      businessProcess.startTask(taskId, true);
    }