我正在使用Servlet和Hibernate创建CRUD应用程序。
当我尝试使用save（）保存一个新实体时，Hibernate会执行SQL Update查询而不是Insert。该实体已经包含了生成的ID（UUID），据我所知，它会在数据库中搜索这个实体（h2 in-memory），但没有找到它。如果ID已经生成，如何正确地将实体保存在数据库中。

@Entity
@Table(name = "MATCH")
public class Match implements Serializable {
    @Id
    @Column(name = "MATCH_ID")
    private UUID id;

    @ManyToOne
    private Player playerOne;

    @ManyToOne
    private Player playerTwo;

    @ManyToOne
    private Player winner;

    @Transient
    private int[] score = new int[2];

    public Match() {

    }

        //getters and setters
}



   public void executePost(HttpServletRequest servletRequest, HttpServletResponse servletResponse) throws ServletException, IOException {
        Transaction transaction = null;
        try (Session session = DBHandler.getSessionFactory().openSession()) {
            transaction = session.beginTransaction();

            UUID MatchUuid = UUID.fromString(servletRequest.getParameter("match-uuid"));  
            currentMatchService = CurrentMatchService.getInstance(); //service stores current matches in the app's memory
            currentMatch = currentMatchService.getMatch(MatchUuid);
            currentMatch.setWinner(currentMatch.getPlayerOne()); //player One set like winner just for test
            session.save(currentMatch);
            transaction.commit();
        } catch (Exception e) {
            if (transaction != null) {
                transaction.rollback();
            }
            e.printStackTrace();
        }