@ControllerAdvice 接收String时 cannot be cast to java.lang.String

 @RequestMapping("/strTest")
  public Object strTest() {
    return "jiang";
  }

@RequestMapping("/test")
  public Object test() {
    return System.currentTimeMillis();
  }

如上两个接口，返回string类型的接口在会报ClassCastException ：Object cannot be cast to java.lang.String 的错误

@ControllerAdvice
public class ResultHandle implements ResponseBodyAdvice