Question

我写的很简单＆＃34; todo＆＃34; Spring Boot中的应用程序。我在开发环境中使用HSQLDB。

我有两张桌子＆＃34; Project＆＃34;和＆＃34;任务＆＃34;。任务表有一对多引用项目表，因为我想列出项目中的所有任务。

当我尝试运行我的应用时，我得到一个例外：

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:1578) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1054) ~[spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:829) ~[spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) ~[spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.4.0.BUILD-SNAPSHOT.jar:1.4.0.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:768) [spring-boot-1.4.0.BUILD-SNAPSHOT.jar:1.4.0.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.4.0.BUILD-SNAPSHOT.jar:1.4.0.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.4.0.BUILD-SNAPSHOT.jar:1.4.0.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1170) [spring-boot-1.4.0.BUILD-SNAPSHOT.jar:1.4.0.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1159) [spring-boot-1.4.0.BUILD-SNAPSHOT.jar:1.4.0.BUILD-SNAPSHOT]
    at pl.mattscode.taskman.TaskmanApplication.main(TaskmanApplication.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:1249) ~[hibernate-entitymanager-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.access$600(EntityManagerFactoryBuilderImpl.java:120) ~[hibernate-entitymanager-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:860) ~[hibernate-entitymanager-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850) ~[hibernate-entitymanager-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:425) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:849) ~[hibernate-entitymanager-4.3.11.Final.jar:4.3.11.Final]
    at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60) ~[spring-orm-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:343) ~[spring-orm-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:318) ~[spring-orm-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    ... 16 common frames omitted
Caused by: org.hibernate.DuplicateMappingException: Same physical table name [project] references several logical table names: [project], [Project]
    at org.hibernate.cfg.Configuration$MappingsImpl.addTableBinding(Configuration.java:3172) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.cfg.annotations.TableBinder.buildAndFillTable(TableBinder.java:321) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.cfg.annotations.TableBinder.buildAndFillTable(TableBinder.java:339) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.cfg.annotations.EntityBinder.bindTable(EntityBinder.java:594) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:677) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:3845) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3799) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1412) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1846) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:857) ~[hibernate-entitymanager-4.3.11.Final.jar:4.3.11.Final]
    ... 24 common frames omitted

这是我的hibernate实体类：

项目

@Entity
@Table(name="project")
public class Project {
  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  @Column(name = "project_id")
  private Long projectId;

  @Column
  private String name;

  public Long getId() {
      return projectId;
  }

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

  public String getName() {
    return name;
  }

  public void setName(String name) {
     this.name = name;
  }
}

任务

 @Entity
  public class Task {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column
    private String name;

    @ManyToOne
    @JoinColumn(name = "project_id")
    private List<Project> projectId;

    public List<Project> getProjectId() {
        return projectId;
    }

    public void setProjectId(List<Project> projectId) {
        this.projectId = projectId;
    }

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}

这就是我查询数据库的方式。

ProjectRepository

@Repository
public interface ProjectRepository extends JpaRepository<Project, Long> {
    @Query("select t.name from Task t inner join Project p on t.id = p.id")
    List<Task> getProjectsWithTasks();
}

有人可以帮我解决问题吗？

修改我添加了@Table(name="project")，将@JoinTable更改为@JoinColumn，我还有其他错误：

org.hibernate.AnnotationException: @OneToOne or @ManyToOne on pl.mattscode.taskman.task.repository.entity.Task.projectId references an unknown entity: java.util.List

Answer 1

如果是@ManytoOne那么字段类型不应该是列表，如果你想要一个项目集合那么它应该是@OneToMany注释

我想修改这些文件。

@Entity
public class Project
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "project_id")
    private Long projectId;

    @Column
    private String name;

    @OneToMany
    @JoinColumn(name = "task_id")
    private List<Task> task;

    public List<Task> getTask()
    {
        return task;
    }

    public void setTask(final List<Task> task)
    {
        this.task = task;
    }

    public Long getId()
    {
        return projectId;
    }

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

    public String getName()
    {
        return name;
    }

    public void setName(final String name)
    {
        this.name = name;
    }
}
@Entity
public class Task
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column
    private String name;

    public Long getId()
    {
        return id;
    }

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

    public String getName()
    {
        return name;
    }

    public void setName(final String name)
    {
        this.name = name;
    }

}

Answer 2

@JoinTable正在尝试创建另一个名为Project的表条目。在您的任务实体中替换：

@ManyToOne
@JoinTable(name="project",
joinColumns = @JoinColumn(name = "project_id"))

到

@JoinColumn(name = "project_id")

Answer 3

我有两个实体类引用同一个表。我只使用一个文件。它与mysql数据库没有任何问题，但谷歌搜索后的oracle和东西我通过删除其他实体类解决了问题。因此，每个表只保留一个实体类，因为其他原因，请保留两个实体类。

Hibernate HSQLDB - DuplicateMappingException

3 个答案: