Java org.postgresql.util.PSQLException:错误：关系；“序列生成”；不存在

我不熟悉Hibernate，现在我正试图使用

@CollectionId

使用'sequence gen'Hibernate sequence generator为我的类Hobbydeals生成一个标识符。下面是我的

StudentDetails

课程，其中包含

hobbydeails

的集合

@Entity
public class StudentDetails {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int studentId;

    private String studentName;

    @ElementCollection
    @JoinTable(name = "STUDENT_HOBBIES", // customised table name
             joinColumns = @JoinColumn(name = "STUDENT_ID"))
    @GenericGenerator(name = "sequence-gen", strategy = "sequence")
    @CollectionId(columns = { @Column(name="HOBBY_ID") }, generator = "sequence-gen", type = @Type(type="long"))
    private Collection<HobbyDetails> hobbies = new ArrayList<HobbyDetails>();

    public int getStudentId() {
        return studentId;
    }

    public void setStudentId(int studentId) {
        this.studentId = studentId;
    }

    public String getStudentName() {
        return studentName;
    }

    public void setStudentName(String studentName) {
        this.studentName = studentName;
    }

    public Collection<HobbyDetails> getHobbies() {
        return hobbies;
    }

    public void setHobbies(Collection<HobbyDetails> hobbies) {
        this.hobbies = hobbies;
    }

}

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我使用的是hibernate版本5.3.1。有人能帮忙吗？

这是因为PostgreSQL数据库中不存在名为“sequence gen”的序列生成器。您需要通过运行以下命令显式创建序列

创建序列发生器

连字符（-）符号将在PostgreSQL数据库中生成语法错误。因此，您需要重命名GenericGenerator

@GenericGenerator(name = "sequence_gen", strategy = "sequence")

@CollectionId(columns = { @Column(name="HOBBY_ID") }, generator = "sequence_gen", type = @Type(type="long"))

private Collection<HobbyDetails> hobbies = new ArrayList<HobbyDetails>();

@GenericGenerator（name=“sequence\u gen”，strategy=“sequence”）
@CollectionId（columns={@Column（name=“HOBBY\u ID”）}，generator=“sequence\u gen”，type=@type（type=“long”））
私人收藏爱好=新建ArrayList（）；

另外，您需要在PostgreSQL数据库中运行以下命令以生成生成器

创建序列

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您正在使用hibernate生成数据库表吗？还是您手动创建的？如果是手动的，还需要创建序列：@paranoidAndroid我使用hibernate生成表。我参考了解决错误的链接“Hilo生成器策略不工作”Ok，很高兴知道

@GenericGenerator(name = "sequence_gen", strategy = "sequence")

@CollectionId(columns = { @Column(name="HOBBY_ID") }, generator = "sequence_gen", type = @Type(type="long"))

private Collection<HobbyDetails> hobbies = new ArrayList<HobbyDetails>();