Java Spring Rest验证配置属性访问

Question

我有一个Spring-JSON/RestAPI,它使用注释驱动的输入验证. @Valid

当我尝试验证另一个对象内的对象时,我收到以下错误.

java.lang.IllegalStateException: JSR-303 validated property 'client.application' does not have a corresponding accessor for Spring data binding - check your DataBinder's configuration (bean property versus direct field access)
    at org.springframework.validation.beanvalidation.SpringValidatorAdapter.processConstraintViolations(SpringValidatorAdapter.java:153) ~[spring-context-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:108) ~[spring-context-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.validation.DataBinder.validate(DataBinder.java:866) ~[spring-context-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    ...

以下是此处使用的json数据模型:

{ // @Valid MessageDTO
  "title": "Test",
  "message":"Test",
  "client": { // @Valid ClientDTO
    "application": "Test"
  }
}

我在这里跳过了java定义,因为它会有太多无用的噪音IMO.

我不想/不能轻易地将getter或setter添加到我的DTO中,那么我该如何关注该错误消息并将我的DataBinder配置为使用"直接字段访问"？我想为此使用JavaConfig(@Configuration).

使用以下依赖项:

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>4.3.2.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>5.2.4.Final</version>
</dependency>

编辑:

控制器:

@RequestMapping(path = "/send", method = { RequestMethod.POST, RequestMethod.PUT })
public void send(@Valid @RequestBody MessageDTO message)

MessageDTO:

public class MessageDTO {

    ...

    @Valid
    @NotNull
    public ClientDTO client;

}

ClientDTO:

public class ClientDTO {

    ...

    @NotEmpty
    public String application;

}

Answer 1

我偶然发现了同样的问题并为我们找到了解决方案,并且只想分享它.

在资源或@ControllerAdvice您可以配置Spring DataBinder以使用直接字段访问.

@ControllerAdvice    
public class CustomControllerAdvice {

    @InitBinder
    private void activateDirectFieldAccess(DataBinder dataBinder) {
        dataBinder.initDirectFieldAccess();
    }

    ...
}

Answer 2

对我来说，解决方案是在 DTO 中添加 getter 和 setter

public class MessageDTO {

    ...

    @Valid
    @NotNull
    public ClientDTO client;

    @NotNull public ClientDTO getClient() { return client; }
    public void setClient(@NotNull ClientDTO client) { this.client = client; }

}