Optional long parameter ‘busId‘ is present but cannot be translated into a null value

今天写一个接口的时候报了下面的错误，接口如下：

@RequestMapping(value = "/isSignOuted", method = RequestMethod.GET)
public String isSignOuted(long busId){
}

Optional long parameter 'busId' is present but cannot be translated into a null value due to being declared as a primitive type. Consider declaring it as object wrapper for the corresponding primitive type.

这是因为这个参数如果是非必须的话，如果前端没有传参数过来的话，会先将参数赋值为null，但是你如果用基本数据类型long的话，它是接收不了null的，所以它建议你将参数的类型声明为包装类型Long，才可以接收null。

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Optional long parameter ‘busId‘ is present but cannot be translated into a null value

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