Hibernate 实体在持久化时抛出 InvocableTargetException

Question

我试图弄清楚为什么在保留修改后的玩家对象时会收到 InvocableTargetException 。 该项目是一个 Spring Roo 项目，使用 Hibernate 作为 ORM（前端使用 GWT，但这与这里无关，因为错误发生在后端）。

单步执行代码，错误发生在通过 RPC 调用调用的player.persist() 处：

@Override
public LeagueDto setPlayerLeague(long playerId, String session, long leagueId) {

    Player player = Player.findPlayer(playerId);
    League league = League.findLeague(leagueId);

    player.setLeague(league);
    player.persist(); // fails here

    // do some more stuff here before returning the DTO

    return leagueDto;
}

进入player.persist() 进入模型：

@RooJavaBean
@RooToString
@RooEntity(finders = { "findPlayersByUsername" })
public class Player {

    @Temporal(TemporalType.TIMESTAMP)
    @DateTimeFormat(style = "S-")
    private Date created;

    @NotNull
    @Column(unique = true)
    @Size(min = 3, max = 32)
    private String Username;

    ....

    @Size(max = 64)
    private String FirstName;

    @Size(max = 64)
    private String LastName;

    @ManyToOne
    private Country country;

    @ManyToOne
    private League league;

    ...

}

进一步进入模型进入调用 persist 的 AspectJ 代码：

privileged aspect Player_Roo_Entity {

    declare @type: Player: @Entity;

    @PersistenceContext
    transient EntityManager Player.entityManager;

    ....

    @Transactional
    public void Player.persist() {
        if (this.entityManager == null) this.entityManager = entityManager();
        this.entityManager.persist(this);
    }

    ....
}

然后它设法跳过 this.entityManager.persist(this) ，当函数退出时，它在 RPC.java 中失败

public static String invokeAndEncodeResponse(Object target,
      Method serviceMethod, Object[] args,
      SerializationPolicy serializationPolicy, int flags)
      throws SerializationException {

       ....

    String responsePayload;
    try {
      Object result = serviceMethod.invoke(target, args);

      responsePayload = encodeResponseForSuccess(serviceMethod, result,
          serializationPolicy, flags);
    } catch (IllegalAccessException e) {
    ....
    } catch (IllegalArgumentException e) {
    ....
    } catch (InvocationTargetException e) {
        // Try to encode the caught exception
        //
        Throwable cause = e.getCause();

        responsePayload = encodeResponseForFailure(serviceMethod, cause,         serializationPolicy, flags);
}

知道为什么会失败吗？我没有做任何复杂的事情，只是进行基本的更新。

Answer 1

我终于破解了。

数据库中的版本字段为空，将其更改为 0 后可以完美运行。
似乎 Hibernate 正在尝试增加 null 字段。

我想我将来在创建灯具数据时会更加小心，不知道 Hibernate 对数据库中的空值如此敏感。