Dropwizard Hibernate 無法定位持久性錯誤

Question

我已經建立了一個 Dropwizard 項目和我的第一個棒球數據 api 端點。 功能表和類名稱是 rangerstats_player / Player。 我嘗試對一個名為 rangerstats_hitter_season_stats 的表執行相同操作，但是在嘗試執行簡單的 GET 時遇到以下錯誤，並且還沒有弄清楚如何修復它或問題是什么

org.hibernate.UnknownEntityTypeException: Unable to locate persister: core.HitterSeasonStats

下面是兩個類/表的代碼，以顯示相似之處，因為我認為模式完全相同，我不知道可能有什么問題。

HitterSeasonStats.java（注釋掉一些字段以嘗試使其工作，以防它們可能是問題）

@Entity
@Table(name = "rangerstats_hitter_season_stats") 
public class HitterSeasonStats {
    @Id
    private long id;
//    @Column(name = "player_id")
//    private long playerId;
    private int g;
    private int pa;
    private int ab;
    //private double avg;
    private int h;
    private int single;
    @Column(name = "double")
    private int doubles;
    private int triple;
    private int hr;
    private int rbi;
    private int bb;
    private int k;
    private int hbp;
    private int sf;
//    private double slg;
//    private double obp;
//    private double ops;
//    private double war;
    //@Column(name = "season_year")
    //private Date seasonYear;

    public long getId() {
        return id;
    }
}

HitterSeasonStatsDAO.java

public class HitterSeasonStatsDAO extends AbstractDAO<HitterSeasonStats> {
    public HitterSeasonStatsDAO(SessionFactory factory) {
        super(factory);
    }

    public Optional<HitterSeasonStats> findById(Long id) {
        return Optional.fromNullable(get(id));
    }

    public List<HitterSeasonStats> findByPlayer(Long playerId) {
        Criteria criteria = criteria().add(Restrictions.eq("playerId", playerId));
        return list(criteria);
    }

    public List<HitterSeasonStats> findByPlayerAndYear(Long playerId) {
    Criteria criteria = criteria().add(Restrictions.eq("playerId", playerId));
        return list(criteria);
    }
}

播放器.java

@Entity
@Table(name = "rangerstats_player")

@NamedQueries({
    @NamedQuery(name = "core.Player.findAll",
            query = "select p from Player p")

})

public class Player {
    @Id
    private long id;
    @Column(name = "first_name")
    private String firstName;
    @Column(name = "last_name")
    private String lastName;
    private String position;
    private String team;
    private String bat;
    @Column(name = "throw_hand")
    private String throwHand;
    private String height;
    private int age;
    private int weight;

    public long getId() {
        return id;
    }
    public String getfirstName() {
        return firstName;
    }
    public String getlastName() {
        return lastName;
    }
    ......
}

PlayerDAO.java

public class PlayerDAO extends AbstractDAO<Player> {

    public PlayerDAO(SessionFactory factory) {
        super(factory);
    }

    public Optional<Player> findById(Long id) {
        return Optional.fromNullable(get(id));
    }

    public List<Player> findAll() {
        return list(namedQuery("core.Player.findAll"));
    }
}

表

rangersstats=# \dt
                     List of relations
 Schema |               Name               | Type  |     Owner     
--------+----------------------------------+-------+---------------
 public | rangerstats_hitter_game_record   | table | owner
 public | rangerstats_hitter_season_stats  | table | owner
 public | rangerstats_pitcher_game_record  | table | owner
 public | rangerstats_pitcher_season_stats | table | owner
 public | rangerstats_player               | table | owner

編輯：

我相信我已經找到了導致問題的原因。 這就是我注冊 HibernateBundle 的方式。 我已經把它們放在一起形成教程，並從它們中獲取了語法。 我看到我只在我的包中使用 Player 類。 我需要找到一種新方法來連接主 Application 類中的數據庫。

 private final HibernateBundle<ApiConfig> hibernatePlayerBundle =
    new HibernateBundle<ApiConfig>(Player.class) {
    @Override
    public DataSourceFactory getDataSourceFactory(ApiConfig configuration) {
        return configuration.getDataSourceFactory();
    }
};

@Override
public void initialize(final Bootstrap<ApiConfig> bootstrap) {
    bootstrap.addBundle(hibernatePlayerBundle);
}

@Override
public void run(final ApiConfig configuration, final Environment environment) {
    final PlayerDAO playerDAO = new PlayerDAO(hibernatePlayerBundle.getSessionFactory());
    final HitterSeasonStatsDAO hitterSeasonStatsDAO = new HitterSeasonStatsDAO(hibernateHitterSeasonStatsBundle.getSessionFactory());
    environment.jersey().register(new HitterSeasonStatsResource(hitterSeasonStatsDAO));
    environment.jersey().register(new PlayerResource(playerDAO));

}

我試圖用另一個類創建並添加另一個包，但看起來我們只能有一個包

java.lang.IllegalArgumentException: A metric named io.dropwizard.db.ManagedPooledDataSource.hibernate.active already exists

編輯：

我需要將逗號分隔的類列表傳遞給 HibernateBundle 構造函數，問題解決了！ :)

Answer 1

為了以后不再出現此類問題，請使用ScanningHibernateBundle 。

ScanningHibernateBundle將掃描core包和所有嵌套的子包，並將所有帶有@Entity注釋的類添加到 Hibernate SessionFactory 。

private final HibernateBundle<ApiConfig> hibernatePlayerBundle =
    new ScanningHibernateBundle<ApiConfig>("core") {
        @Override
        public DataSourceFactory getDataSourceFactory(ApiConfig configuration) {
            return configuration.getDataSourceFactory();
        }
};

最好使用core.model包名代替core 。