SpringBoot + Hibernate关系问题

时间：2017-06-08 15:11:48

标签： java hibernate jpa spring-boot mapping

我对3个实体的关系存在问题。我试图有一个继承heriarchy但在子类中我引用了我的Parent类对象的List作为属性。所以我希望我的子类实体成为一个映射器表，其中显示了它与它的父节点之间的关联。在这样做时，我遇到了一堆关系问题 我已经创建了一个模拟功能的示例项目。

Automobile.java 

import java.io.Serializable;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.OneToOne;

@Entity
@Inheritance(strategy=InheritanceType.JOINED)
public abstract class Automobile implements Serializable{

private static final long serialVersionUID = 1L;

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long Id;

@OneToOne
private Manufacturer manufacturer;

@OneToOne
private AutomobileType autotype;

@OneToOne
private LoanerCar loanerCarID;

private String vin;

//Getters and Setters, Arg Constructors, No-Arg Constructor, toString
}

LoanerCar.java 

package com.example.demo.domains;

import java.sql.Timestamp;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.OneToMany;

@Entity
public class LoanerCar extends Automobile{

private static final long serialVersionUID = 1L;
private String name;
private Timestamp dateLoaned;
private Timestamp dateReceived;

@OneToMany
private List<Automobile> alist;

//Getters and Setters, Arg Constructors, No-Arg Constructor, toString
}

TotaledCar.java 

import java.util.List;
import javax.persistence.Entity;

@Entity
public class TotaledCar extends Automobile {

private static final long serialVersionUID = 1L;

private List<LoanerCar> eligibleLoaners;

// Getters and Setters，Arg构造函数，No-Arg构造函数，toString     }

AutomobileBaseRepository.java 

import java.util.List;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.repository.NoRepositoryBean;
import com.example.demo.domains.Automobile;
import com.example.demo.domains.Manufacturer;   

@NoRepositoryBean

public interface AutomobileBaseRepository<T extends Automobile> extends JpaRepository<T, Long> {
List<T> findByLoanerCarID(Long id);

List<T> findByVinAndManufacturerAndLoanerCarID(String vin, Manufacturer manfacturer, Long id);
}

Automobile，TotaledCar，LoanerCar存储库扩展了AutomobileBaseRespoistory，并且没有方法。

LoaanerController.java 

import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.example.demo.domains.LoanerCar;
import com.example.demo.domains.Manufacturer;
import com.example.demo.domains.TotaledCar;
import com.example.demo.repositories.LoanerCarRepository;
import com.example.demo.repositories.ManufacturerRepository;
import com.example.demo.repositories.TotaledCarRepository;

@RestController
public class LoanerController {

    @Autowired
    LoanerCarRepository loanerRepo;

    @Autowired
    TotaledCarRepository totaledCarRepo;

    @Autowired
    ManufacturerRepository manRepo;


    @RequestMapping(value="/loaner/all", method = RequestMethod.GET)
    public List<LoanerCar> loaners(){
        List<LoanerCar> list = loanerRepo.findAll();
        return list;
    } 

    @RequestMapping(value="/loaner/{id}", method=RequestMethod.GET)
    public LoanerCar getLoaner(@PathVariable Long id){
        LoanerCar loanerCar= loanerRepo.findOne(id);
        return loanerCar;
    }


    @RequestMapping(value="/loaner", method=RequestMethod.GET)
    public String response(@RequestParam("vin") String vin, @RequestParam("manufacturer") Long manfuacturerId, @RequestParam("loanerId") Long loanerId){
        Manufacturer manObj = manRepo.findById(manfuacturerId);

        List<LoanerCar> loanerList = loanerRepo.findByLoanerCarID(loanerId);
        List<TotaledCar> tlist = totaledCarRepo.findByVinAndManufacturerAndLoanerCarID(vin, manObj, loanerId);

        for (TotaledCar junk : tlist){
            loanerList.addAll(junk.getEligibleLoaners());
        }

        String strlist = loanerList.toString();
        return strlist;
    }
}

因此，这个映射的流程应该是从我添加汽车时开始，默认情况下它的loanerId为null。当我为loanerId赋值时，它被映射到LoanerCar表，其中有一个来自父类/表的AutomobileId，而loanerId驻留在LoanerCar类/表中。因此，在LoanerCar表中，loanerId绑定到符合LoanerCars条件的汽车列表。所以汽车有一个loanerId，那个loanerId可以很多汽车。我的控制器方法只会给我一个总计和租车的列表。我知道这听起来令人困惑，但我知道这就是我想要实现的目标。

堆栈跟踪 

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1081) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:856) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at com.example.demo.SpringJpaInheritanceRelationshipsApplication.main(SpringJpaInheritanceRelationshipsApplication.java:10) [classes/:na]
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:954) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:882) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
    at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60) ~[spring-orm-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:353) ~[spring-orm-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:370) ~[spring-orm-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:359) ~[spring-orm-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    ... 16 common frames omitted
Caused by: org.hibernate.MappingException: Could not determine type for: java.util.List, at table: totaled_car, for columns: [org.hibernate.mapping.Column(eligible_loaners)]
    at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:431) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:398) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.mapping.Property.isValid(Property.java:225) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:595) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.mapping.JoinedSubclass.validate(JoinedSubclass.java:44) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.boot.internal.MetadataImpl.validate(MetadataImpl.java:329) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:443) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:879) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
    ... 22 common frames omitted

1 个答案:

答案 0 :(得分：0)

您正在使用字段访问策略（由@Id注释确定）。将任何与JPA相关的注释放在

之上 
private List<LoanerCar> eligibleLoaners;

请参阅here

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