SpringDataRest 和@Lob 属性中的投影问题

Question

我有一个实体人：

@Entity
public class Person implements Serializable {
@Id
@GeneratedValue(strategy = AUTO, generator = "PERSON_SEQ")
private Integer idPerson;
private String lastName;
private String firstName;
@Lob
private byte[] picture;

一个存储库

public interface PersonRepository extends PagingAndSortingRepository<Person, Integer> {}

投影

@Projection(name = "picture", types = { Person.class })
public interface ProjectionPicturePerson {
  byte[] getPicture();

}

当我使用投影时：..../persons/1?projection=picture 我有这个错误

There was an unexpected error (type=Internal Server Error, status=500). Could not write content: [B cannot be cast to [Ljava.lang.Object; (through reference chain: org.springframework.data.rest.webmvc.json.["content"]->$Proxy109["picture"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: [B cannot be cast to [Ljava.lang.Object; (through reference chain: org.springframework.data.rest.webmvc.json.["content"]->$Proxy109["picture"])

当我在字符串上使用投影时，例如 lastName 它有效

@Projection(name = "lastName", types = { Person.class })
public interface ProjectionLastName {
   String getLastName();
}

当我不使用投影时它也可以工作

jackson 序列化图像属性

Blob 有限制吗？

Answer 1

这是 ProxyProjectionFactory 中的错误。我已经为您提交并修复了 DATACMNS-722 计划在即将发布的服务版本中（下周中）。

SpringDataRest 和@Lob 属性中的投影问题

Issue with projection in SpringDataRest and @Lob attribute

projection

spring-data-jpa

spring-data-rest