Hibernate 錯誤消息：在刷新之前保存瞬態實例

Question

在嘗試創建一對多關系時，我收到“在刷新前保存瞬態實例”錯誤消息使用 Spring JPA 連接到 PostgreSQL。 “Alquiler”（一個）是我實體的名稱，另一個是“Peliculas”（對許多人）

請注意，我已經添加了 cascade = CascadeType.ALL 並且仍然遇到問題。 這是我試圖創建關系的 class 。 幫助！

package com.Project.Movies.model;

import java.util.Date;
import java.util.List;

import javax.persistence.*;

@Entity
@Table(name = "Alquiler")
public class Alquiler {
@Id
@SequenceGenerator(
        name = "alquiler_seq",
        sequenceName = "alquiler_seq",
        allocationSize = 1
        )
@GeneratedValue(
        strategy = GenerationType.SEQUENCE,
        generator = "alquiler_seq"
        )

private Long id;

int dias;
float costopordia;
String formapago;
Date fechaAlquiler;

@Column
@ElementCollection(targetClass=Pelicula.class)
private List<Pelicula> peliculas;

@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "id")
private Socio socio;


public Alquiler() {
    super();
}

public Alquiler(int dias, float costopordia, String formapago, Date fechaAlquiler, List<Pelicula> pelicula, Socio socio) {
    super();
    this.dias = dias;
    this.costopordia = costopordia;
    this.formapago = formapago;
    this.fechaAlquiler = fechaAlquiler;
    this.peliculas = pelicula;
    this.socio = socio;
}

public Long getId() {
    return id;
}

public void setId(Long id) {
    this.id = id;
}

public Date getFechaAlquiler() {
    return fechaAlquiler;
}

public void setFechaAlquiler(Date fechaAlquiler) {
    this.fechaAlquiler = fechaAlquiler;
}

@OneToMany(targetEntity=Pelicula.class, cascade = CascadeType.ALL,orphanRemoval = true)
public List<Pelicula> getPeliculas() {
    return peliculas;
}

public void setPeliculas(List<Pelicula> pelicula) {
    this.peliculas = pelicula;
}

public Socio getSocio() {
    return socio;
}

public void setSocio(Socio socio) {
    this.socio = socio;
}

boolean CrearAlquiler() {
    return true;
}

public int getDias() {
    return dias;
}

public void setDias(int dias) {
    this.dias = dias;
}

public float getCostopordia() {
    return costopordia;
}

public void setCostopordia(float costopordia) {
    this.costopordia = costopordia;
}

public String getFormapago() {
    return formapago;
}

public void setFormapago(String formapago) {
    this.formapago = formapago;
}

}

Alquiler 配置 Class

package com.Project.Movies.model;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.springframework.boot.CommandLineRunner;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AlquilerConfig {
@Bean
CommandLineRunner commandLineRunnerA(IAlquilerRepository ialquilerRepository)
{
    
return args ->{
    
    List<Pelicula> myList = new ArrayList<Pelicula>();
    
    Pelicula shawshank = new Pelicula("The Shawshank Redemption",1994,"2hr 22mins","Two imprisoned men bond over a number of years, finding solace and eventual redemption through...","Frank Darabont","B","Drama",3);
    Pelicula inception = new Pelicula("Inception",2010,"2hrs 28mins","Dom Cobb es un ladrón con una extraña habilidad para entrar a los sueños de la gente y robarles los secretos de sus subconscientes","Christopher Nolan","C","Science Fiction",4);
    Pelicula fightclub = new Pelicula("Fight Club",1999,"2hrs 19mins","Un empleado de oficina insomne, harto de su vida, se cruza con un vendedor peculiar...","David Fincher","C","Suspenso/Drama",2);                 
    
    myList.add(inception);
    
    myList.add(shawshank);
    myList.add(inception);
    myList.add(fightclub);
    
    Socio mariana= new Socio("Mariana Navidad","Arcos #34, Los Arcos","4446784563");
    Socio sebastian= new Socio("Sebastian Mendoza","Rios #38, Mares","4336784563");
    Socio roberto= new Socio("Roberto Obregon","Estrella #89, Universo","4556784563");
    
    Alquiler shawshankAlquiler = new Alquiler(3,30,"efectivo",new Date(),myList,mariana);
    Alquiler inceptionAlquiler = new Alquiler(5,25,"tarjeta",new Date(),myList,sebastian);
    Alquiler inceptionAlquiler2 = new Alquiler(5,25,"efectivo",new Date(),myList,roberto);
    
    ialquilerRepository.saveAll(List.of(shawshankAlquiler,inceptionAlquiler,inceptionAlquiler2));
};  
}

}

錯誤信息

java.lang.IllegalStateException: Failed to execute CommandLineRunner at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:794) ~[spring-boot-2.5.6.jar:2.5.6] at org.springframework.boot. SpringApplication.callRunners(SpringApplication.java:775) ~[spring-boot-2.5.6.jar:2.5.6] at org.springframework.boot.SpringApplication.run(SpringApplication.java:345) ~[spring-boot-2.5 .6.jar:2.5.6] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) ~[spring-boot-2.5.6.jar:2.5.6] at org.springframework.boot.SpringApplication .run(SpringApplication.java:1332) ~[spring-boot-2.5.6.jar:2.5.6] 在 Z4D236D9A2D102C5FE6AD1C50DA4BEC 50Z.univaProject.UnivaMovies.UnivaMoviesApplication.main(UnivaMoviesApplication.java:11) ~[classes/:na] Caused by: org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient沖洗前的實例：com.univaProject.UnivaMovies.model.Pelicula； nested exception is java.lang.IllegalStateException: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.univaProject.UnivaMovies.model.Pelicula at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible (EntityManagerFactoryUtils.java:371) ~[spring-orm-5.3.12.jar:5.3.12] at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:235) ~[spring-orm- 5.3.12.jar:5.3.12] 在 org.springframework.orm.ZF0B4A299C4 5171493AE3215D69D9B0A6Z.JpaTransactionManager.doCommit(JpaTransactionManager.java:566) ~[spring-orm-5.3.12.jar:5.3.12] at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:743) ~[spring -tx-5.3.12.jar:5.3.12] at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:711) ~[spring-tx-5.3.12.jar:5.3.12] at org .springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:654) ~[spring-tx-5.3.12.jar:5.3.12] at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.Z93F725A07423FE1C 889F448B33D21F46Z:407) ~[spring-tx-5.3.12.jar:5.3.12] at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.12.jar :5.3.12] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.12.jar:5.3.12] at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor .invoke(PersistenceExceptionTranslationInterceptor.java:137) ~[spring-tx-5.3.12.jar:5.3.12] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop- 5.3.12.jar:5.3.12] 在 org.springframework.data.jpa.repository.suppo rt.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:174) ~[spring-data-jpa-2.5.6.jar:2.5.6] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186 ) ~[spring-aop-5.3.12.jar:5.3.12] at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97) ~[spring-aop-5.3.12.jar:5.3. 12] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.12.jar:5.3.12] at org.springframework.aop.framework.JdkDynamicAopProxy.invoke( JdkDynamicAopProxy.java:215) ~[spring-aop-5.3.12.Z68995FCBF432492D15484D0 4A9D2AC40Z:5.3.12] at com.sun.proxy.$Proxy87.saveAll(Unknown Source) ~[na:na] at com.univaProject.UnivaMovies.model.AlquilerConfig.lambda$0(AlquilerConfig.java:39) ~[classes /:na] at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:791) ~[spring-boot-2.5.6.jar:2.5.6]...省略5個常用框架

Answer 1

您說您添加了CascadeType 。 但是您沒有將其添加到Pelicula關系中。 當您嘗試保存Alquiler Hibernate 時發現Pelicula沒有保存，並且由於它沒有CascadeType它給出了該異常。

Map 這樣

@OneToMany(cascade = CascadeType.PERSIST)
private List<Pelicula> peliculas;