多次调用 jpa repository.save() 抛出异常
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【中文标题】多次调用 jpa repository.save() 抛出异常【英文标题】：Calling jpa repository.save() multiple times throws exception 【发布时间】：2015-10-10 21:57:44 【问题描述】：我想多次调用 jpa repository.save。
但是当我第二次尝试保存对象时，它会抛出 PersistentObjectException 并说分离的实体传递给持久化。
代码和异常如下。我错过了什么？
public void createGame(GameTeamRequest gameTeamRequest)
for(Entry<String, Integer> hm : gameTeamRequest.getTeamsInnigsPostionMap().entrySet())
GameTeam gameTeam = new GameTeam();
Team team = new Team();
team.setTeamName(hm.getKey());
gameTeam.setTeam(team);
gameTeam.setGame(gameTeamRequest.getGame());
gameTeam.setInningsPosition(hm.getValue());
gameTeamRepository.save(gameTeam);
例外情况如下：
SEVERE: Servlet.service() for servlet [appServlet] in context with path [/iscorecard] threw exception [Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessApiUsageException: detached entity passed to persist: com.dragonfly.iscorecard.domain.Game; nested exception is org.hibernate.PersistentObjectException: detached entity passed to persist: com.dragonfly.iscorecard.domain.Game] with root cause
org.hibernate.PersistentObjectException: detached entity passed to persist: com.dragonfly.iscorecard.domain.Game
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:141)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:842)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:835)
at org.hibernate.engine.spi.EJB3CascadingAction$1.cascade(EJB3CascadingAction.java:52)
at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:387)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:330)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:208)
at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:165)
at org.hibernate.event.internal.AbstractSaveEventListener.cascadeBeforeSave(AbstractSaveEventListener.java:424)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:263)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:192)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:135)
at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:78)
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:208)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:151)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:78)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:852)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:826)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:830)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:865)
游戏类：
@Entity
@Table(name = "GAME")
public class Game extends Model
@Column(name = "TOURNAMENT_ID")
private String tournamentId;
@OneToMany(mappedBy = "game")
private Set<GameTeam> gameTeam;
团队班：
@Entity
@Table(name = "TEAM")
public class Team extends Model
@Column(name = "TEAM_NAME")
private String teamName;
@OneToMany(mappedBy = "game")
private Set<GameTeam> gameTeam;
游戏团队：
@Entity
@Table(name = "GAME_TEAM")
public class GameTeam extends Model
@ManyToOne(cascade = CascadeType.PERSIST, CascadeType.MERGE )
@JoinColumn(name = "GAME_ID")
private Game game;
@ManyToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "TEAM_ID")
private Team team;
@Column(name = "INNINGS_POSITION")
private int inningsPosition;
【问题讨论】：
可能是您忽略了一些 JPA 规则，您的示例没有提供所有信息，我邀请您查看此网站并阅读其他内容aquiseprograma.co/category/jpa 【参考方案1】：例外是指 Game 对象，因此看起来您正在为第二个 GameTeam 设置一个分离的 Game。 您可以通过添加（至少）来解决此问题
cascade = CascadeType.PERSIST, CascadeType.MERGE
到您的映射。
【讨论】：
我应该将它添加到哪个类和字段中？ 到 GameTeam 中游戏属性的映射 - 也许将您的实体代码添加到您的问题中以获得更详细的答案。 然后添加您的实体以上是关于多次调用 jpa repository.save() 抛出异常的主要内容，如果未能解决你的问题，请参考以下文章