将表的组件映射为另一个表中的arraylist，如onetomany

Question

我正在使用JPA和hibernate持久性管理器。

我有两个类，LibraryLoanSystem.java和User.java。

library loan system.Java

 @Entity
    public class LibraryLoanSystem {

        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        private Integer idOfLLS;

        @Transient
        private ArrayList<Loan> loans = new ArrayList<Loan>();

        @Transient
        private ArrayList<Loanable> loanables = new ArrayList<Loanable>();

        @OneToMany
        @JoinTable(name = "USER" , joinColumns = @JoinColumn(name = "studentId"))
        private ArrayList<User> users = new ArrayList<User>();

        @Transient
        private ObservableList<Material> materialData = FXCollections.observableArrayList();

        public LibraryLoanSystem() {

            populateUsers();
            populateMaterials();
        } //getters,setters and methods

user.Java

@Entity
@Table(name = "User")
public class User {

    /* Name of the User */
    @Column(name = "name", nullable = false)
    private String name;

    /* Date of Birth for the User */
    @Column(name = "dateOfBirth",nullable = false)
    private LocalDate dateOfBirth;

    /* Student ID of the User */
    @Id
    @Column(name = "studentId", updatable = false, nullable = false)
    private String studentId;
//constructor,getters & setters

基本上，libraryloansystem中的ArrayList用户是系统中所有用户的列表，也就是说。用户表行中的所有用户记录。这两个java类之间存在聚合关系，onetomany，libraryloansystem有多个用户，但用户只有一个系统。我不确定如何绘制它们，我得到了

非法尝试将非集合映射为@OneToMany，@ ManyToMany或@CollectionOfElements：controller.LibraryLoanSystem.users

在我的尝试。我怎样才能正确映射这个arraylist？谢谢