Spring常见错误之Web嵌套对象校验失效解决办法

import lombok.Data;
import javax.validation.constraints.Size;
@Data
public class Student {
    @Size(max = 10)
    private String name;
    private short age;
    private Phone phone;
}

@Data
class Phone {
    @Size(max = 10)
    private String number;
}

import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
@RestController
@Slf4j
@Validated
public class StudentController {
    @RequestMapping(path = "students", method = RequestMethod.POST)
    public void addStudent(@Validated @RequestBody Student student){
        log.info("add new student: {}", student.toString());
        //省略业务代码
    };
}

POST http://localhost:8080/students
Content-Type: application/json
{
  "name": "xiaoming",
  "age": 10,
  "phone": {"number":"12306123061230612306"}
}

@Override
public final <T> Set<ConstraintViolation<T>> validate(T object, Class<?>... groups) {
   //省略部分非关键代码
   Class<T> rootBeanClass = (Class<T>) object.getClass();
   //获取校验对象类型的“信息”（包含“约束”）
   BeanMetaData<T> rootBeanMetaData = beanMetaDataManager.getBeanMetaData( rootBeanClass );

   if ( !rootBeanMetaData.hasConstraints() ) {
      return Collections.emptySet();
   }

   //省略部分非关键代码
   //执行校验
   return validateInContext( validationContext, valueContext, validationOrder );
}

private CascadingMetaDataBuilder getCascadingMetaData(Type type, AnnotatedElement annotatedElement,
      Map<TypeVariable<?>, CascadingMetaDataBuilder> containerElementTypesCascadingMetaData) {
   return CascadingMetaDataBuilder.annotatedObject( type, annotatedElement.isAnnotationPresent( Valid.class ), containerElementTypesCascadingMetaData,
               getGroupConversions( annotatedElement ) );
}

@Valid
private Phone phone;