java.util.HashSet 无法转换为 org.hibernate.collection.PersistentCollection

Question

我已将几个模型类中的代码从字段访问器更改为属性访问器，并且还从 List 更改为 Set，因为顺序并不重要。以下是我的实体类。

@Entity
@Table(name = "TPYP_GAME")
public class Game extends AbstractGeneratedIdEntity{
    private static final long serialVersionUID = -1390767030654384142L;

    private static final String GAME_FIELD = "GAME";

    private GameypeEnum gameTypeEnum;    
    private Set<GameCode> gameCodes;    

    @Transient
    public GameTypeEnum getGameTypeEnum() {
        return gameTypeEnum;
    }

    @OneToMany(cascade = CascadeType.ALL, mappedBy = GAME_FIELD, fetch = FetchType.LAZY)
    public Set<GameCode> getGameCodes() {
        return gameCodes;
    }

    public void setGameTypeEnum(GameTypeEnum gameTypeEnum) {
        this.gameTypeEnum = gameTypeEnum;
    }

    public void setGameCodes(Set<GameCode> gameCodes) {
        this.gameCodes = gameCodes;
    }

我调试了源代码，发现从存储库获取数据后提交事务时抛出以下异常。

 org.springframework.transaction.TransactionSystemException: Could not commit JPA transaction;
 nested exception is javax.persistence.RollbackException: Error while committing the transaction
 javax.persistence.RollbackException: Error while committing the transaction java.util.HashSet 
 cannot be cast to org.hibernate.collection.PersistentCollection

我不知道如何解决它。我错过了什么？

<小时/>

客户端代码:

    @Transactional(readOnly = true) 
    public List<Game> getGames(String nameContains, Long pageSize){ 
    if(!nameContains.isEmpty() && pageSize !=null){ 
    return repository.findAll(nameIsLike(nameContains), constructPageSpecification(pageSize)).getContent(); }
    else{ if(pageSize != null){ 
    return repository.findAll(null, constructPageSpecification(pageSize)).getContent(); }
    else if(!nameContains.isEmpty()){ 
    return repository.findAll(nameIsLike(nameContains)); }else{ return repository.findAll(); 
}
 }
     }

Answer 1

看起来setGameCodes正在用新创建的HashSet替换从数据库读取的Set，而不是添加到现有的或从现有的中删除当您尝试将更改提交回数据库时，这会导致问题。

也许setGameCodes应该做

this.gameCodes.clear();
this.gameCodes.addAll(gameCodes);

而不是

this.gameCodes = gameCodes;