无法解析符号“NOT_FOUND”[关闭]

我有这个Java代码，我想将其迁移到最新的Spring Boot：

旧代码：

HttpStatus httpStatusCode = ex.getStatusCode();

switch (httpStatusCode) {
  case NOT_FOUND:
    .....
  case BAD_REQUEST:
    .....
}

新代码

HttpStatusCode httpStatusCode = ex.getStatusCode();

switch (httpStatusCode) {
  case NOT_FOUND:
    .....
  case BAD_REQUEST:
    .....
}

我收到错误：Cannot resolve symbol 'NOT_FOUND'您知道实施此检查的正确方法是什么吗？