Java Hibernate HSQLDB-重复映射异常

我正在用SpringBoot编写简单的“todo”应用程序。 我正在开发环境中使用HSQLDB

我有两张表“Project”和“Task”。 任务表对项目表有一对多引用，因为我想列出项目中的所有任务

当我尝试运行我的应用程序时，出现异常：

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;
    }

}

---

@JoinTable正在尝试创建另一个与Project同名的表项。在任务实体中，替换：

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

到

---

如果是

@manytone

，则字段类型不应是列表，如果需要项目集合，则应为

@OneToMany

注释

如果您想尝试，我已经修改了这些文件

@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;
    }

}

@实体
公共类项目
{
@身份证
@GeneratedValue（策略=GenerationType.IDENTITY）
@列（name=“project\u id”）
私人长投射；
@纵队
私有字符串名称；
@独身癖
@JoinColumn（name=“task\u id”）
私有列表任务；
公共列表getTask（）
{
返回任务；
}
公共无效设置任务（最终列表任务）
{
this.task=任务；
}
公共长getId（）
{
返回投影；
}
公共无效集合id（最终长id）
{
this.projectd=id；
}
公共字符串getName（）
{
返回名称；
}
public void setName（最终字符串名）
{
this.name=名称；
}
}
@实体
公开课任务
{
@身份证
@GeneratedValue（策略=GenerationType.IDENTITY）
私人长id；
@纵队
私有字符串名称；
公共长getId（）
{
返回id；
}
公共无效集合id（最终长id）
{
this.id=id；
}
公共字符串getName（）
{
返回名称；
}
public void setName（最终字符串名）
{
this.name=名称；
}
}

我有两个实体类引用同一个表。我只使用了一个文件。它与mysql db没有任何问题，但对于oracle，在谷歌搜索和其他东西之后，我通过删除另一个实体类解决了这个问题。

---

因此，每个表只保留一个实体类，而不保留两个实体类，即使是出于其他原因。

是否仍然存在重复映射异常？或者其他什么eror？这是另一个org.hibernate.AnnotationException。我把它贴在了帖子的底部。我改成了@OneToMany，它仍然是一样的（org.hibernate.AnnotationException:）我已经用这两个实体编辑了我的回复，请检查它们是否解决了你的问题。感谢它们解决了我的问题。你能解释一下我犯错误的原因吗？你的要求是向你的项目中添加多个任务，所以它必须是一个项目上的一个任务列表。此外，当实体名称与表名称相同时，不需要表注释。

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

@JoinColumn(name = "project_id")

@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;
    }

}