问题
I have the following design:
One sports game has two scores (one per team) and each score has multiple player stats, one per jersey number. Both relationships are mapped as Map. This is just multi-level aggregation.
Game entity:
@Entity
@Table(name = "\"Games\"")
@NamedQuery(name = Game.FIND_ALL, query = "SELECT ga FROM Game ga")
@NamedEntityGraph(name = Game.FETCH_SCORES, attributeNodes = {@NamedAttributeNode("scores")})
@NamedEntityGraph(name = Game.FETCH_SCORES_AND_PLAYER_STATS,
attributeNodes = {@NamedAttributeNode(value = "scores", subgraph = Score.FETCH_PLAYER_STATS)},
subgraphs = {@NamedSubgraph(name = Score.FETCH_PLAYER_STATS, attributeNodes = @NamedAttributeNode("playerStats"))}
)
public class Game implements Serializable
{
private static final long serialVersionUID = 1L;
public static final String FIND_ALL = "Game.findAll";
public static final String FETCH_SCORES = "Game.fetchScores";
public static final String FETCH_SCORES_AND_PLAYER_STATS = "Game.fetchScoresAndPlayerStats";
@Id
@Column
private Integer id;
@Basic(optional = false)
@Column(name = "scheduled_tipoff")
private LocalDateTime scheduledTipoff;
@OneToMany(mappedBy = "game")
// @MapKey(name = "home")
@MapKeyColumn(name = "is_home", insertable = false, updatable = false)
private Map<Boolean, Score> scores;
...
}
Score entity (PK is "home or away of a game", so a Boolean home in the PK is enough):
@Entity
@Table(name = "\"Scores\"")
@IdClass(ScoreId.class)
public class Score implements Serializable
{
private static final long serialVersionUID = 1L;
public static final String FETCH_PLAYER_STATS = "Score.fetchPlayerStats";
@Id
@Column(name = "game_id")
private Integer gameId;
@Id
@Column(name = "is_home")
private Boolean home;
@Basic(optional = false)
@Column(name = "roster_id")
private Integer rosterId;
@Basic
@Column(name = "final_score")
private Integer finalScore;
@ManyToOne(optional = false, fetch = FetchType.EAGER)
@JoinColumn(name = "game_id", insertable = false, updatable = false)
private Game game;
@OneToMany(mappedBy = "score")
@MapKeyColumn(name = "jersey_nbr")
private Map<Integer, PlayerStat> playerStats;
...
}
ScoreId PK class:
public class ScoreId implements Serializable
{
private static final long serialVersionUID = 1L;
private Integer game;
private Boolean home;
...
}
PlayerStat entity:
@Entity
@Table(name = "\"PlayerStats\"")
@IdClass(PlayerStatId.class)
public class PlayerStat implements Serializable
{
private static final long serialVersionUID = 1L;
@Id
@Column(name = "game_id")
private Integer gameId;
@Id
@Column(name = "is_home")
private Boolean home;
@Id
@Column(name = "player_id")
private Integer playerId;
@Basic(optional = false)
@Column(name = "jersey_nbr", insertable = false, updatable = false)
private Integer jerseyNbr;
@ManyToOne(optional = false, fetch = FetchType.EAGER)
@JoinColumn(name = "game_id", referencedColumnName = "game_id", insertable = false, updatable = false)
@JoinColumn(name = "is_home", referencedColumnName = "is_home", insertable = false, updatable = false)
private Score score;
...
}
PlayerStatId:
public class PlayerStatId implements Serializable
{
private static final long serialVersionUID = 1L;
private Integer gameId;
private Boolean home;
private Integer playerId;
...
}
The following query works:
// fetch only scores: OK
games = gameService.findByNamedQuery( Game.FIND_BY_GROUP, Game.FETCH_SCORES, with( "roundId", group.getRoundId() ).and( "groupCode", group.getCode() ).map() );
Taking it one level further to fetch player stats attached to each score:
// fetch player stats: not OK
games = gameService.findByNamedQuery( Game.FIND_BY_GROUP, Game.FETCH_SCORES_AND_PLAYER_STATS, with( "roundId", group.getRoundId() ).and( "groupCode", group.getCode() ).map() );
...EclipseLink fails with:
Caused by: javax.persistence.PersistenceException: java.lang.ClassCastException: org.eclipse.persistence.indirection.IndirectMap cannot be cast to org.eclipse.persistence.queries.FetchGroupTracker
at org.eclipse.persistence.internal.jpa.QueryImpl.getResultList(QueryImpl.java:493)
at net.bbstatstest.i303.GameService.findAllWithScores(GameService.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.jboss.as.ee.component.ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptor.java:52)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:509)
at org.jboss.as.weld.ejb.DelegatingInterceptorInvocationContext.proceed(DelegatingInterceptorInvocationContext.java:92)
at org.jboss.weld.interceptor.proxy.WeldInvocationContextImpl.interceptorChainCompleted(WeldInvocationContextImpl.java:107)
at org.jboss.weld.interceptor.proxy.WeldInvocationContextImpl.proceed(WeldInvocationContextImpl.java:126)
at com.arjuna.ats.jta.cdi.transactional.TransactionalInterceptorBase.invokeInCallerTx(TransactionalInterceptorBase.java:203)
at com.arjuna.ats.jta.cdi.transactional.TransactionalInterceptorSupports.doIntercept(TransactionalInterceptorSupports.java:55)
at com.arjuna.ats.jta.cdi.transactional.TransactionalInterceptorBase.intercept(TransactionalInterceptorBase.java:86)
at com.arjuna.ats.jta.cdi.transactional.TransactionalInterceptorSupports.intercept(TransactionalInterceptorSupports.java:47)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.jboss.weld.interceptor.reader.SimpleInterceptorInvocation$SimpleMethodInvocation.invoke(SimpleInterceptorInvocation.java:73)
at org.jboss.weld.interceptor.proxy.WeldInvocationContextImpl.invokeNext(WeldInvocationContextImpl.java:92)
at org.jboss.weld.interceptor.proxy.WeldInvocationContextImpl.proceed(WeldInvocationContextImpl.java:124)
at org.jboss.weld.bean.InterceptorImpl.intercept(InterceptorImpl.java:105)
at org.jboss.as.weld.ejb.DelegatingInterceptorInvocationContext.proceed(DelegatingInterceptorInvocationContext.java:82)
at org.jboss.as.weld.interceptors.EjbComponentInterceptorSupport.delegateInterception(EjbComponentInterceptorSupport.java:60)
at org.jboss.as.weld.interceptors.Jsr299BindingsInterceptor.delegateInterception(Jsr299BindingsInterceptor.java:77)
at org.jboss.as.weld.interceptors.Jsr299BindingsInterceptor.doMethodInterception(Jsr299BindingsInterceptor.java:89)
at org.jboss.as.weld.interceptors.Jsr299BindingsInterceptor.processInvocation(Jsr299BindingsInterceptor.java:102)
at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:63)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.component.invocationmetrics.ExecutionTimeInterceptor.processInvocation(ExecutionTimeInterceptor.java:43)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.jpa.interceptor.SBInvocationInterceptor.processInvocation(SBInvocationInterceptor.java:47)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ee.concurrent.ConcurrentContextInterceptor.processInvocation(ConcurrentContextInterceptor.java:45)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:40)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:53)
at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:52)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.component.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:51)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.component.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:54)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:252)
... 133 more
Caused by: java.lang.ClassCastException: org.eclipse.persistence.indirection.IndirectMap cannot be cast to org.eclipse.persistence.queries.FetchGroupTracker
at org.eclipse.persistence.descriptors.FetchGroupManager.getObjectFetchGroup(FetchGroupManager.java:697)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.load(ObjectBuilder.java:788)
at org.eclipse.persistence.internal.sessions.AbstractSession.load(AbstractSession.java:5335)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1249)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:911)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1191)
at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:485)
at org.eclipse.persistence.internal.sessions.AbstractSession.internalExecuteQuery(AbstractSession.java:3356)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1898)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1880)
at org.eclipse.persistence.internal.indirection.QueryBasedValueHolder.instantiate(QueryBasedValueHolder.java:135)
at org.eclipse.persistence.internal.indirection.QueryBasedValueHolder.instantiate(QueryBasedValueHolder.java:122)
at org.eclipse.persistence.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:97)
at org.eclipse.persistence.internal.indirection.UnitOfWorkValueHolder.instantiateImpl(UnitOfWorkValueHolder.java:175)
at org.eclipse.persistence.internal.indirection.UnitOfWorkValueHolder.instantiate(UnitOfWorkValueHolder.java:238)
at org.eclipse.persistence.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:97)
at org.eclipse.persistence.indirection.IndirectMap.buildDelegate(IndirectMap.java:129)
at org.eclipse.persistence.indirection.IndirectMap.getDelegate(IndirectMap.java:416)
at org.eclipse.persistence.indirection.IndirectMap.size(IndirectMap.java:952)
at org.eclipse.persistence.internal.queries.MapContainerPolicy.sizeFor(MapContainerPolicy.java:848)
at org.eclipse.persistence.internal.indirection.TransparentIndirectionPolicy.instantiateObject(TransparentIndirectionPolicy.java:392)
at org.eclipse.persistence.mappings.ForeignReferenceMapping.instantiateAttribute(ForeignReferenceMapping.java:1136)
at org.eclipse.persistence.mappings.CollectionMapping.load(CollectionMapping.java:1404)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.load(ObjectBuilder.java:813)
at org.eclipse.persistence.internal.sessions.AbstractSession.load(AbstractSession.java:5335)
at org.eclipse.persistence.internal.sessions.AbstractSession.load(AbstractSession.java:5327)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1249)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:911)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1191)
at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:485)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1279)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2983)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1898)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1880)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1845)
at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:262)
at org.eclipse.persistence.internal.jpa.QueryImpl.getResultList(QueryImpl.java:482)
... 179 more
QUESTION:
What's wrong? There must be something going wrong with subgraph = Score.FETCH_PLAYER_STATS.
Is this a bug in EclipseLink? Mappings wrong? Query + graph wrong?
EclipseLink version is 2.7.7, see stacktrace.
PS: This works in Hibernate BTW.
回答1:
It's a bug.
See https://bugs.eclipse.org/bugs/show_bug.cgi?id=495892
It boils down to EclipseLink being unable to handle a Map type using entity sub graphs.
When using @MapKey, the CCE is Hashtable to FetchgroupTracker, if you use @MapKeyColumn the CCE is IndirectMap to FetchGroupTracker.
来源：https://stackoverflow.com/questions/62305036/org-eclipse-persistence-indirection-indirectmap-cannot-be-cast-to-org-eclipse-pe