在Java Spring JPA中插入包含对其他实体的引用的列

我正在创建一个数据库，保存有关其他数据库的信息，我想插入一个条目.课程如下所示:

@Entity
@Table(name = "table_info")
public class TableInfo {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private Long id;

    @OneToOne
    @JoinColumn(name = "database_id")
    private DatabaseInfo databaseInfo;

    @Column(name = "table_name", length = 255, nullable = false)
    private String tableName;

    @Column(name = "created_at")
    private Timestamp createdAt;
    // Getter Setters, etc
}

@Entity(name = "UserInfo")
@Table(
        name = "UserInfo",
        uniqueConstraints = {
                @UniqueConstraint(name = "user_unique", columnNames = "username")
        }
)
public class UserInfo {

    @Id
    @SequenceGenerator(
            name = "userinfo_sequence",
            sequenceName = "userinfo_sequence",
            allocationSize = 1
    )
    @GeneratedValue(
            strategy = GenerationType.SEQUENCE,
            generator = "userinfo_sequence"
    )
    @Column(
            name = "id",
            updatable = false
    )
    private Long id;

    @Column(
            name = "masterID",
            updatable = true,
            nullable = false
    )
    private Long masterID;

    @Column(
            name = "username",
            updatable = false,
            nullable = false,
            columnDefinition = "TEXT"
    )
    private String username;

    @Column(
            name = "email",
            updatable = false,
            nullable = false,
            columnDefinition = "TEXT"
    )
    private String email;

    @Column(
            name = "password_hash",
            updatable = true,
            nullable = false,
            columnDefinition = "TEXT"
    )
    private String password_hash;
    // Getter Setters, etc

}

@Entity
@Table(name = "ownership_details")
public class OwnershipDetails {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ownership_details_id")
    private Long id;

    @Column(name = "access_level")
    private Integer access_level;

    @OneToOne(
            cascade = CascadeType.MERGE,
            fetch = FetchType.LAZY,
            orphanRemoval = true
    )
    @JoinColumn(name = "user_id", referencedColumnName = "id")
    private UserInfo user;

    @OneToOne(
        cascade = CascadeType.MERGE,
        fetch = FetchType.LAZY,
        orphanRemoval = true
    )
    @JoinColumn(name = "table_id", referencedColumnName = "id")
    private TableInfo tableInfo;
}

以下是我的Ownership Detail存储库:

@Repository
public interface OwnershipDetailsRepository extends JpaRepository<OwnershipDetails, Long> {
    
}

每当我try 插入新的Ownership Detail对象时，我只需使用: ownershipDetailsRepository.save(ownershipDetails);个

每当我这样做时，我都会收到一个错误: not-null property references a null or transient value : project.BackEnd.User.UserInfo.email个 这显然意味着它正在try 插入一个新的userInfo对象，而不是创建对已经存在的对象的引用.我的问题是，如何才能强制它创建引用，而不是try 在数据库中创建另一个实体.