1

私はスーパークラスとして次のクラスを持っています

@Entity
@MappedSuperclass
public class Location implements LocationCapable {

    @Basic
    private Double latitude;

    @Basic
    private Double longitude;

    @Basic
    private List<String> geocells;

    @PrePersist
    @Transient
    private void generateGeoCells() {
        geocells = GeocellManager.generateGeoCell(getLocation());
    }

    public Double getLongitude() {
        return longitude;
    }

    public void setLongitude(Double longitude) {
        this.longitude = longitude;
    }

    public Double getLatitude() {
        return latitude;
    }

    public void setLatitude(Double latitude) {
        this.latitude = latitude;
    }

    @Override
    @Transient
    @JsonIgnore
    public Point getLocation() {
        return new Point(latitude, longitude);
    }

    @Override
    @Transient
    @JsonIgnore
    public String getKeyString() {
        return latitude + ":" + longitude;
    }

    @Override
    public List<String> getGeocells() {
        return geocells;
    }

    public void setGeocells(List<String> geocells) {
        this.geocells = geocells;
    }

}

そしてこれから受け継ぐもう一つ

しかし、JUnitテストを実行しようとすると、これが発生しました

Caused by: org.datanucleus.metadata.InvalidMetaDataException: Class Location has application-identity and no objectid-class specified yet has 0 primary key fields. Unable to use SingleFieldIdentity.
at org.datanucleus.metadata.AbstractClassMetaData.determineObjectIdClass(AbstractClassMetaData.java:1032)
at org.datanucleus.metadata.ClassMetaData.populate(ClassMetaData.java:205)
at org.datanucleus.metadata.AbstractClassMetaData.validateSuperClass(AbstractClassMetaData.java:720)
at org.datanucleus.metadata.AbstractClassMetaData.determineSuperClassName(AbstractClassMetaData.java:642)
at org.datanucleus.metadata.ClassMetaData.populate(ClassMetaData.java:193)
at org.datanucleus.metadata.MetaDataManager$1.run(MetaDataManager.java:2317)
at java.security.AccessController.doPrivileged(Native Method)
at org.datanucleus.metadata.MetaDataManager.populateAbstractClassMetaData(MetaDataManager.java:2311)
at org.datanucleus.metadata.MetaDataManager.populateFileMetaData(MetaDataManager.java:2148)
at org.datanucleus.metadata.MetaDataManager.initialiseFileMetaDataForUse(MetaDataManager.java:864)
at org.datanucleus.metadata.MetaDataManager.loadPersistenceUnit(MetaDataManager.java:794)
at org.datanucleus.jpa.EntityManagerFactoryImpl.initialisePMF(EntityManagerFactoryImpl.java:488)
at org.datanucleus.jpa.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:355)
at org.datanucleus.store.appengine.jpa.DatastoreEntityManagerFactory.<init>(DatastoreEntityManagerFactory.java:63)
at org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider.createEntityManagerFactory(DatastorePersistenceProvider.java:35)
at javax.persistence.Persistence.createFactory(Persistence.java:172)
... 67 more

また、@ Idで注釈が付けられたキーフィールドをsupperclassに追加しようとしましたが、結果が得られません。

4

2 に答える 2

2

メッセージにあるように、@Id フィールドが必要です。

于 2011-01-18T10:15:17.390 に答える
0

プラグインの拡張またはEclipseに問題があったようですが、IDEを再起動した後は、問題が解消されました。しかし、IDに関するこの問題だけです。実際、私は埋め込みエンティティに関連する別の非常に奇妙な問題に直面しました。私は次のドメインモデルを持っています：

@Entity
public class City {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Key id;
    @Basic
    private String name;
    // Entity won't persist if location is not null, requires to persist with
    // further update
    @Embedded
    // @OneToOne(cascade = CascadeType.ALL) it works the same when I add or remove this line
    private Location location;

    /* getters and setters */
} 

@Embeddable
public class Location implements LocationCapable {
    @Basic
    @NotNull
    private Double latitude;
    @Basic
    @NotNull
    private Double longitude;
    @Basic
    private List<String> geocells;

    /* getters and setters */
}

それをテストするために、私は次のJUnitテストケースを持っています：

    @Test
    public void testSave() throws Exception {
        City city = new City("testCity1", new Location(1d, 1d));
        cityDao.persist(city);
        assertNotNull(city.getId());
    }

cityDao.persist(city)単純にjpaTemplate.persist(object);

そして、このエンティティを永続化しようとすると、次の例外が発生しました。

Caused by: java.lang.IllegalArgumentException: out of field index :-1
    at com.myproject.model.Location.jdoProvideField(Location.java)
    at org.datanucleus.state.JDOStateManagerImpl.provideField(JDOStateManagerImpl.java:2585)
    at org.datanucleus.state.JDOStateManagerImpl.provideField(JDOStateManagerImpl.java:2555)
    at org.datanucleus.store.mapped.mapping.CollectionMapping.postInsert(CollectionMapping.java:91)
    at org.datanucleus.store.mapped.mapping.EmbeddedPCMapping.postInsert(EmbeddedPCMapping.java:104)
    at org.datanucleus.store.appengine.DatastoreRelationFieldManager.runPostInsertMappingCallbacks(DatastoreRelationFieldManager.java:217)
    at org.datanucleus.store.appengine.DatastoreRelationFieldManager.access$200(DatastoreRelationFieldManager.java:48)
    at org.datanucleus.store.appengine.DatastoreRelationFieldManager$1.apply(DatastoreRelationFieldManager.java:116)
    at org.datanucleus.store.appengine.DatastoreRelationFieldManager.storeRelations(DatastoreRelationFieldManager.java:81)
    at org.datanucleus.store.appengine.DatastoreFieldManager.storeRelations(DatastoreFieldManager.java:955)
    at org.datanucleus.store.appengine.DatastorePersistenceHandler.storeRelations(DatastorePersistenceHandler.java:546)
    at org.datanucleus.store.appengine.DatastorePersistenceHandler.insertPostProcess(DatastorePersistenceHandler.java:304)
    at org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObjects(DatastorePersistenceHandler.java:256)
    at org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObject(DatastorePersistenceHandler.java:240)
    at org.datanucleus.state.JDOStateManagerImpl.internalMakePersistent(JDOStateManagerImpl.java:3185)
    at org.datanucleus.state.JDOStateManagerImpl.flush(JDOStateManagerImpl.java:4513)
    at org.datanucleus.ObjectManagerImpl.flushInternal(ObjectManagerImpl.java:2814)
    at org.datanucleus.ObjectManagerImpl.flush(ObjectManagerImpl.java:2754)
    at org.datanucleus.ObjectManagerImpl.preCommit(ObjectManagerImpl.java:2893)
    at org.datanucleus.TransactionImpl.internalPreCommit(TransactionImpl.java:369)
    at org.datanucleus.TransactionImpl.commit(TransactionImpl.java:256)
    at org.datanucleus.jpa.EntityTransactionImpl.commit(EntityTransactionImpl.java:104)
    at org.datanucleus.store.appengine.jpa.DatastoreEntityTransactionImpl.commit(DatastoreEntityTransactionImpl.java:55)
    at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:467)
    ... 41 more
于 2011-01-21T11:25:13.743 に答える