org.hibernate.MappingException Hibernate 映射列

Question

这是我的堆栈跟踪：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocatio
n of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.MappingException: Could not determine type f
or: com.example.CovidPandemySimulation.domain.primitive.record.RecordSimulation, at table: record, for columns: [org.hibernate.mapping.Column(record_simulation)]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1788) ~[spring-beans-5.3.2.jar:5.3.2]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:609) ~[spring-beans-5.3.2.jar:5.3.2]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:531) ~[spring-beans-5.3.2.jar:5.3.2]
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.2.jar:5.3.2]
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.2.jar:5.3.2]
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.2.jar:5.3.2]
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.2.jar:5.3.2]
        at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1159) ~[spring-context-5.3.2.jar:5.3.2]
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913) ~[spring-context-5.3.2.jar:5.3.2]
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:588) ~[spring-context-5.3.2.jar:5.3.2]
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.1.jar:2.4.1]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767) ~[spring-boot-2.4.1.jar:2.4.1]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) ~[spring-boot-2.4.1.jar:2.4.1]
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) ~[spring-boot-2.4.1.jar:2.4.1]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) ~[spring-boot-2.4.1.jar:2.4.1]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1309) ~[spring-boot-2.4.1.jar:2.4.1]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1298) ~[spring-boot-2.4.1.jar:2.4.1]
        at com.example.CovidPandemySimulation.CovidPandemySimulationApplication.main(CovidPandemySimulationApplication.java:10) ~[main/:na]
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.MappingException: Could not determine type for: com.example.CovidPandemySimula
tion.domain.primitive.record.RecordSimulation, at table: record, for columns: [org.hibernate.mapping.Column(record_simulation)]
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:421) ~[spring-orm-5.3.2.jar:5.3.2]
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:396) ~[spring-orm-5.3.2.jar:5.3.2]
        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.3.2.jar:5.3.2]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1847) ~[spring-beans-5.3.2.jar:5.3.2]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1784) ~[spring-beans-5.3.2.jar:5.3.2]
        ... 17 common frames omitted
Caused by: org.hibernate.MappingException: Could not determine type for: com.example.CovidPandemySimulation.domain.primitive.record.RecordSimulation, at table: record, for columns: [org.hibernate.mapping.Column(record_simulation)]

第一个实体：

@Entity
@Table(name = "Record")
@Getter
public class Record extends BaseEntity
{
    RecordParameters recordParameters;
    RecordSimulation recordSimulation;

    public Record(RecordParameters recordParameters) {
        this.recordParameters = recordParameters;
        this.recordSimulation = new RecordSimulation();
    }
}

第二实体：

@Entity
@Table(name = "Simulation")
@Getter
public class Simulation extends BaseEntity
{
    private Name name;
    private SimulationParameters simulationParameters;
    private SimulationRecords simulationRecords;

    public Simulation(Name name, SimulationParameters simulationParameters) {
        this.name = name;
        this.simulationParameters = simulationParameters;
        this.simulationRecords = new SimulationRecords();
    }
}

记录实体的第一个映射：

public class RecordSimulation {                     
    @ManyToOne                                      
    @JoinColumn(name="simulation_id")               
    private Simulation simulation;                  
                                                    
    public RecordSimulation()                       
    {                                               
        this(null);                                 
    }                                               
                                                    
    public RecordSimulation(Simulation simulation)  
    {                                               
        this.simulation = simulation;               
    }                                               
}

模拟实体的第二个映射：

public class SimulationRecords {            
                                            
    @OneToMany(mappedBy = "simulation")     
    private Set<Record> records;            
                                            
    public SimulationRecords()              
    {                                       
        this.records = new HashSet<>();     
    }                                       
}                                           

在没有映射这些关系的情况下一切正常，在添加这个之后我得到这样的堆栈跟踪，所以我很确定有一个错误。 如果有人能找到一个错误，我会很高兴。 感谢您的回答。

Answer 1

我发现RecordSimulation和SimulationRecords是多余的。 这样的设计违背了 Hibernate 和 JPA 的原则。

我推荐以下方法：

@Entity
@Table(name = "Record")
@Getter
public class Record extends BaseEntity
{
    @ManyToOne
    private Simulation simulation;

}

@Entity
@Table(name = "Simulation")
@Getter
public class Simulation extends BaseEntity
{

    @OneToMany
    private SimulationRecords simulationRecords;

}

RecordParameters没有属性，我看不出这种设计有任何原因。 删除 class RecordParameters并将其属性放入 class Record 。

SimulationParameters也一样：删除这个 class 并将其属性放到 class Simulation中。