JPA Map ManyToOne與IdClass的關係 - persistence.ArgumentException

Question

我想用Apache OpenJPA 2.2.0映射兩個具有manyToOne/oneToMay關係的類。 其中一個班有兩個屬性的主鍵：

@Entity(name = "Player") 
@IdClass(PlayerId.class) 
public class Player { 
    @Id 
    private String nickname; 
    @Id 
    @ManyToOne(cascade = CascadeType.PERSIST) 
    @JoinColumn(name = "team_id") 
    private Team team; 

    public Player() { 

    } 

    public String getNickname() { 
     return nickname; 
    } 

    public void setNickname(String nickname) { 
     this.nickname = nickname; 
    } 

    public Team getTeam() { 
     return team; 
    } 

    public void setTeam(Team team) { 
     this.team = team; 
    } 

} 

public class PlayerId { 
    private String nickname; 
    private Team team; 

    public PlayerId() { 
    } 

    public String getNickname() { 
     return nickname; 
    } 

    public void setNickname(String nickname) { 
     this.nickname = nickname; 
    } 

    public Team getTeam() { 
     return team; 
    } 

    public void setTeam(Team team) { 
     this.team = team; 
    } 

    @Override 
    public boolean equals(Object o) { 
     return ((o instanceof PlayerId) && 
       this.nickname == ((PlayerId)o).getNickname() && 
       this.team == ((PlayerId) o).getTeam()); 
    } 

    public int hashCode() { 
     return nickname.hashCode() + team.hashCode(); 
    } 
} 

@Entity(name = "Team") 
public class Team { 
    @Id 
    private String name; 

    @OneToMany(mappedBy = "team", targetEntity = Player.class, fetch = FetchType.EAGER, cascade = CascadeType.PERSIST) 
    private List<Player> players; 

    public Team() { 

    } 

    public List<Player> getPlayers() { 
     return players; 
    } 

    public void setPlayers(List<Player> p) { 
     players = p; 
    } 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 
} 

所以，當我創建一個團隊，我得到了follwing例外一個新的播放器：

Exception in thread "main" <openjpa-2.2.0-r422266:1244990 fatal user error> org.apache.openjpa.persistence.ArgumentException: Errors encountered while resolving metadata. See nested exceptions for details. 
    at org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:668) 
    at org.apache.openjpa.meta.MetaDataRepository.getMetaDataInternal(MetaDataRepository.java:411) 
    at org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:384) 
    at org.apache.openjpa.meta.MetaDataRepository.resolveMeta(MetaDataRepository.java:714) 
    at org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:643) 
    at org.apache.openjpa.meta.MetaDataRepository.getMetaDataInternal(MetaDataRepository.java:411) 
    at org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:384) 
    at org.apache.openjpa.jdbc.meta.MappingRepository.getMapping(MappingRepository.java:355) 
    at org.apache.openjpa.jdbc.meta.MappingTool.getMapping(MappingTool.java:682) 
    at org.apache.openjpa.jdbc.meta.MappingTool.buildSchema(MappingTool.java:754) 
    at org.apache.openjpa.jdbc.meta.MappingTool.run(MappingTool.java:652) 
    at org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory.synchronizeMappings(JDBCBrokerFactory.java:154) 
    at org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory.synchronizeMappings(JDBCBrokerFactory.java:164) 
    at org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory.newBrokerImpl(JDBCBrokerFactory.java:122) 
    at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:209) 
    at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:156) 
    at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:227) 
    at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:154) 
    at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:60) 
    at main.Main.main(Main.java:27) 
Caused by: <openjpa-2.2.0-r422266:1244990 fatal user error> org.apache.openjpa.persistence.ArgumentException: The id class specified by type "class model.Player" does not match the primary key fields of the class. Make sure your identity class has the same primary keys as your persistent type, including pk field types. Mismatched property: "team" 
    at org.apache.openjpa.meta.ClassMetaData.validateAppIdClassPKs(ClassMetaData.java:2216) 
    at org.apache.openjpa.meta.ClassMetaData.validateAppIdClass(ClassMetaData.java:2090) 
    at org.apache.openjpa.meta.ClassMetaData.validateIdentity(ClassMetaData.java:2026) 
    at org.apache.openjpa.meta.ClassMetaData.validateMeta(ClassMetaData.java:1938) 
    at org.apache.openjpa.meta.ClassMetaData.resolve(ClassMetaData.java:1799) 
    at org.apache.openjpa.meta.MetaDataRepository.processBuffer(MetaDataRepository.java:822) 
    at org.apache.openjpa.meta.MetaDataRepository.resolveMeta(MetaDataRepository.java:719) 
    at org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:643) 
    ... 19 more 
NestedThrowables: 
<openjpa-2.2.0-r422266:1244990 fatal user error> org.apache.openjpa.persistence.ArgumentException: Attempt to map "model.Player.team" failed: the owning entity is not mapped. 
    at org.apache.openjpa.jdbc.meta.MappingInfo.assertTable(MappingInfo.java:628) 
    at org.apache.openjpa.jdbc.meta.MappingInfo.createForeignKey(MappingInfo.java:1079) 
    at org.apache.openjpa.jdbc.meta.ValueMappingInfo.getTypeJoin(ValueMappingInfo.java:115) 
    at org.apache.openjpa.jdbc.meta.ValueMappingInfo.getTypeJoin(ValueMappingInfo.java:92) 
    at org.apache.openjpa.jdbc.meta.strats.RelationFieldStrategy.map(RelationFieldStrategy.java:167) 
    at org.apache.openjpa.jdbc.meta.FieldMapping.setStrategy(FieldMapping.java:146) 
    at org.apache.openjpa.jdbc.meta.RuntimeStrategyInstaller.installStrategy(RuntimeStrategyInstaller.java:82) 
    at org.apache.openjpa.jdbc.meta.FieldMapping.resolveMapping(FieldMapping.java:496) 
    at org.apache.openjpa.jdbc.meta.FieldMapping.resolve(FieldMapping.java:461) 
    at org.apache.openjpa.jdbc.meta.strats.RelationToManyInverseKeyFieldStrategy.map(RelationToManyInverseKeyFieldStrategy.java:135) 
    at org.apache.openjpa.jdbc.meta.strats.RelationCollectionInverseKeyFieldStrategy.map(RelationCollectionInverseKeyFieldStrategy.java:95) 
    at org.apache.openjpa.jdbc.meta.FieldMapping.setStrategy(FieldMapping.java:146) 
    at org.apache.openjpa.jdbc.meta.RuntimeStrategyInstaller.installStrategy(RuntimeStrategyInstaller.java:82) 
    at org.apache.openjpa.jdbc.meta.FieldMapping.resolveMapping(FieldMapping.java:496) 
    at org.apache.openjpa.jdbc.meta.FieldMapping.resolve(FieldMapping.java:461) 
    at org.apache.openjpa.jdbc.meta.ClassMapping.resolveMapping(ClassMapping.java:854) 
    at org.apache.openjpa.meta.ClassMetaData.resolve(ClassMetaData.java:1802) 
    at org.apache.openjpa.meta.MetaDataRepository.processBuffer(MetaDataRepository.java:822) 
    at org.apache.openjpa.meta.MetaDataRepository.resolveMapping(MetaDataRepository.java:777) 
    at org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:657) 
    at org.apache.openjpa.meta.MetaDataRepository.getMetaDataInternal(MetaDataRepository.java:411) 
    at org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:384) 
    at org.apache.openjpa.meta.MetaDataRepository.resolveMeta(MetaDataRepository.java:714) 
    at org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:643) 
    at org.apache.openjpa.meta.MetaDataRepository.getMetaDataInternal(MetaDataRepository.java:411) 
    at org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:384) 
    at org.apache.openjpa.jdbc.meta.MappingRepository.getMapping(MappingRepository.java:355) 
    at org.apache.openjpa.jdbc.meta.MappingTool.getMapping(MappingTool.java:682) 
    at org.apache.openjpa.jdbc.meta.MappingTool.buildSchema(MappingTool.java:754) 
    at org.apache.openjpa.jdbc.meta.MappingTool.run(MappingTool.java:652) 
    at org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory.synchronizeMappings(JDBCBrokerFactory.java:154) 
    at org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory.synchronizeMappings(JDBCBrokerFactory.java:164) 
    at org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory.newBrokerImpl(JDBCBrokerFactory.java:122) 
    at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:209) 
    at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:156) 
    at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:227) 
    at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:154) 
    at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:60) 
    at main.Main.main(Main.java:27) 

我知道爲什麼我得到這個，但我不能修復它。 有人可以幫我嗎？

沒有問題，當我使用生成的主鍵（也許長ID）沒有IdClass。 但我需要IdClass。

問候 Veote

Answer 1

我的猜測：

public class PlayerId { 
    private String nickname; 
    private Team team; -> this should be "name" to match the Id in the class Team. 

... 

} 

它更容易在這種情況下，我認爲使用@EmbeddedId。見http://docs.jboss.org/hibernate/annotations/3.5/reference/en/html_single/

的簡單的例子從網站：

@Entity 
class User { 
    @EmbeddedId 
    @AttributeOverride(name="firstName", column=@Column(name="fld_firstname") 
    UserId id; 

    Integer age; 
} 

@Embeddable 
class UserId implements Serializable { 
    String firstName; 
    String lastName; 
} 

我也從類PlayerId，這似乎不是一個合理的設計選擇一見傾心刪除團隊。

Answer 2

我有，你有同樣的問題，結果發現我的解決方案在這裏： https://wiki.eclipse.org/EclipseLink/Examples/JPA/2.0/DerivedIdentifiers

您should't在idClass新增的實體，而是你的實體的ID。因此，嘗試

public class PlayerId { 
    private String nickname; 
    private String team; 

    ... 
}