Kotlin是否需要NotNull? [英] Is NotNull needed on Kotlin?

问题描述

我有一堂课

class User(

    var name: String

)

以及映射的帖子请求:

@PostMapping("/user")
fun test(@Valid @RequestBody user: User) {
    //...
}

如果客户端将使用name: null发送用户的JSON怎么办?它会被MVC验证程序拒绝还是会引发异常?我应该用@NotNull注释name吗?不幸的是，我无法检查，因为只能编写测试(无法创建User(null)).

What if a client will send a JSON of a user with name: null? Will it be rejected by the MVC Validator or an exception will be throwed? Should I annotate name with @NotNull? Unfortunately, I cannot check that because only can write tests (it is not available to create User(null)).

推荐答案

如我所测试的，@NotNull完全不影响MVC验证.在正常的控制台中，您只会收到WARN消息:

As I tested, @NotNull doesn't affect on the MVC validation at all. You will only receive a WARN message in console which is normal:

无法读取HTTP消息:org.springframework.http.converter.HttpMessageNotReadableException:无法读取文档:...的实例化.

Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: Could not read document: Instantiation of...

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