无法保存“多个”-使用Spring Boot的@OneTo多国实体

Question

我正在使用Spring Boot和MySQL。我按照这个链接设置了所有内容，我能够连接到MySql并读/写数据。但有一个1:n的关系，我无法保存多方面的实体：

    @Entity
    public class OneSideOfRelationship {
      @Id
      @GeneratedValue(strategy = GenerationType.AUTO)
      private long oneId;
      private String someText;
      @OneToMany(mappedBy="oneId")
      private List<ManySideOfRelationship> manySide;

      [Constructor / Getter / Setter]
    }

    @Entity
    public class ManySideOfRelationship {
      @Id
      @GeneratedValue(strategy = GenerationType.AUTO)
      private long manyId;
      @ManyToOne(targetEntity=OneSideOfRelationship.class)
      @JoinColumn
      private long oneId;
      private String someMoreText;

      [Constructor / Getter / Setter]
    }

    @Transactional
    public interface OneDao extends CrudRepository<OneSideOfRelationship, Long> {}

    @Transactional
    public interface ManyDao extends CrudRepository<ManySideOfRelationship, Long> {}

如果我在控制器中执行此操作：

    [...]
    @Autowired
    @private ManySideOfRelationship manyDao;
    [...]
      ManySideOfRelationship many = new ManySideOfRelationship();
      many.setOneId(1L);
      many.setSomeMoreText("Text");
      manyDao.save(many);
    [...]

我得到了：

    org.springframework.orm.jpa.JpaSystemException: could not get a field value by reflection getter of com.package.database.OneSideOfRelationship.oneId; nested exception is org.hibernate.PropertyAccessException: could not get a field value by reflection getter of com.package.database.OneSideOfRelationship.oneId

从我的申请中删除。属性：

    spring.datasource.url = jdbc:mysql://myurl:myport/mydatabase
    spring.datasource.username = myusername
    spring.datasource.password = mypassword
    spring.jpa.hibernate.ddl-auto = update
    spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
    spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

还有一些来自pom的东西。xml

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>

希望有人有主意。

Answer 1

oneId的数据类型必须为OneSideOf关系不长。

  @ManyToOne(targetEntity=OneSideOfRelationship.class)
  @JoinColumn
  private OneSideOfRelationship oneId;