我想用Apache OpenJPA 2.2.0映射一个具有manyToOne / oneToMay关系的两个类。
一类具有两个属性的主键：
@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;
}
}
因此，当我与团队创建新玩家时，我会得到以下例外：
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)
我知道为什么得到这个，但是我无法解决。
有人能帮我吗？
当我使用没有IdClass的生成的主键（也许是长ID）时，没有问题。
但是我需要IdClass。
最好的祝福
投票
最佳答案
我猜：
public class PlayerId {
private String nickname;
private Team team; -> this should be "name" to match the Id in the class Team.
...
}
我认为在这种情况下使用@EmbeddedId更容易。见http://docs.jboss.org/hibernate/annotations/3.5/reference/en/html_single/
该站点的简单示例：
@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;
}
我还要从PlayerId类中删除Team，乍一看这似乎不是一个合理的设计选择。
关于java - JPA将IdClass与ManyToOne关系映射-persistence.ArgumentException，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/9617859/