Question

我正在尝试在我们的项目中设置数据库。但是当我尝试在@MappedSuperclass实体上使用@ManyToOne和@ OneToMany时，我遇到了一些错误：

@MappedSuperclass
public abstract class Person extends Model{
//public abstract class Person {

    // ATTRIBUTES
    @Column(columnDefinition = "varchar(20) not null")
    private String firstName;
    @Column(columnDefinition = "varchar(20) not null")
    private String lastName;
    @Column(columnDefinition = "varchar(20) not null")
    private String password;
    @Column(columnDefinition = "varchar(50) not null")
    private String eMail;
    @Column(columnDefinition = "varchar(8) not null")
    private String svn;
    private static int staticId = 0;  // Identifier, staticId is unique.
    @Id
    @Column(columnDefinition = "integer not null")
    private int id;
    @Column(columnDefinition = "integer")
    private int age;
    @Column(columnDefinition = "varchar(10)")
    private String telephoneNumber;
    @Column(columnDefinition = "decimal(10,2)")
    private double salary;
    @Column(columnDefinition = "boolean")
    private boolean allowedOvertime;
    //@OneToMany(mappedBy = "person")
    private List<TimeEntryMonth> listTimeEntryMonth;
    @OneToMany(mappedBy = "person")
    private List<Vacation> listVacation;
    @OneToMany(mappedBy = "person")
    private List<SickLeave> listSickLeave;

其中一个从Person扩展的类：

@Entity
public class Employee extends Person {

    // ATTRIBUTES
    private String position;
    private Boss boss;

其中一个@OneToMany关系：

public class SickLeave extends Model {

    /* ATTRIBUTES */
    @Id
    private int id;
    @ManyToOne
    private Person person;
    private int personIdSL;
    private String reason;

如果我在没有@ManyToOne和@OneToMany的情况下编译我的整个项目，它将正常工作。但随着它将导致som错误：

注入构造函数时出错，java.lang.RuntimeException：读取错误 models.SickLeave
的注释

我试图删除摘要并用@Entity替换@MappedSuperclass并且该项目有效。所以我认为我不能在@MappedSuperclass上拥有@OneToMany和@ManyToOne关系，但我不想重构我的整个项目

有没有（更简单的）方法来处理这些问题？

谢谢。

Answer 1

Person不是Entity，因此您无法使用OneToMany。您需要Person Entity或指向Employee，这似乎对我更有意义。

使用@MappedSuperclass在Play中使用@ManyToOne获取错误

1 个答案: