... cannot be translated into a null value due to being declared as a primitive type 解决方法

问题描述

HTTP Status 500 - Request processing failed; nested exception is java.lang.IllegalStateException: Optional int parameter ‘pageNo’ 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.

(请求处理失败；嵌套的例外是java.lang.IllegalStateException:存在可选的int参数“pageNo”，但由于被声明为基元类型，因此无法转换为null值。考虑将其声明为相应基元类型的对象包装器。)

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原因分析：

int 不可以为null，但int的包装类Integer可以为null。

//错误代码：参数可能是null，用int会出错
public Object query(int pageNo,int pageSize){
}

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解决方案：

将参数类型由int改为Integer即可

public Object query(Integer pageNo,Integer pageSize){
}