尝试使用JPA存储库获取数据时出现问题,
每次我尝试获取数据时,总会出现错误java.lang.ClassCastException:shurl.model.Shurl无法转换为java.io.Serializable,
我曾尝试探索解决方案,但直到现在仍未找到解决此问题的任何线索
2019-04-03 07:36:17.434 ERROR 19348 --- [nio-5001-exec-4] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.ClassCastException: shurl.model.Shurl cannot be cast to java.io.Serializable] with root cause
java.lang.ClassCastException: shurl.model.Shurl cannot be cast to java.io.Serializable
这里是我在jpa存储库中的代码
package shurl.repository
import shurl.model.Shurl
import org.springframework.data.jpa.repository.JpaRepository
import org.springframework.data.jpa.repository.Query
import org.springframework.stereotype.Repository
import org.springframework.data.domain.Pageable
import org.springframework.data.domain.Page
import java.time.LocalDate
import java.time.LocalDateTime
import shurl.model.ShurlHistory
@Repository
interface ShurlHistoryRepository : JpaRepository<ShurlHistory, String> {
@Query("select b.* from shurl a " +
"left join shurl_history b on b.shurl_code = a.shurl_code " +
"where a.shurl_code = :code",nativeQuery = true )
fun findShurlHistory(code:String):List<ShurlHistory>?
}
这里是我的模型
package shurl.model
import com.fasterxml.jackson.annotation.JsonIgnore
import javax.persistence.*
import org.apache.poi.hpsf.Decimal
import java.time.LocalDate
import java.sql.Blob
import org.hibernate.type.BlobType
import java.time.LocalDateTime
@Entity
@Table(name = "shurl_history", schema = "dbo")
data class ShurlHistory (
@Id @GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id", nullable = true)
var id:Long?=null,
@Column(name = "create_date", nullable = false )
var createDate:LocalDateTime = LocalDateTime.now(),
@ManyToOne
@JoinColumn(name = "shurl_code", referencedColumnName = "shurl_code", nullable = true)
var shurl : Shurl? = null
)
有人可以帮我吗?
答案 0 :(得分:0)
我认为我找到了无法序列化的解决方案,我在shurl类中删除了id属性,并将shurl_code设置为主键。
答案 1 :(得分:0)
如果您使用非主键列引用另一个对象,则使引用的对象可序列化。
这是一个known bug,创建于2012年,至今仍未解决。
使Shurl
可序列化,它应该可以工作:
@Entity
public class Shurl implements Serializable {
private static final long serialVersionUID = 1L;
}