Aufteilung einer Hibernate-Entität auf 2 Tabellen

Question

Ich habe eine einfache Klassenhierarchie, die ich versuche, mit Hibernate/JPA zu arbeiten.

Grundsätzlich, was ich will, ist für die MovementData in eine eigene Tabelle mit einem FK auf die Integer-ID der Hauptfahrzeug-Tabelle in der Datenbank zu sein.

Mache ich etwas falsch? Wie kann ich sonst etwas Ähnliches erreichen? Ich bin mir ziemlich sicher, dass ich die JPA-Spezifikation befolge. (EJB3 In Action sagt, dass dies funktionieren sollte: EJB3 in Aktion: @SekundärTabelle

Hier ist ein Teil der Ausnahme, die ich erhalte:

SEVERE: an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session)
org.hibernate.AssertionFailure: Table MOVEMENT_DATA not found
    at org.hibernate.persister.entity.JoinedSubclassEntityPersister.getTableId(JoinedSubclassEntityPersister.java:480)
    at org.hibernate.persister.entity.JoinedSubclassEntityPersister.<init>(JoinedSubclassEntityPersister.java:259)
    at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:87)
    at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:261)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1327)

Hier sind einige der Protokollierungsinformationen von Hibernate, die sich auf das Fahrzeug beziehen... Es sieht so aus, als ob alles gut erkannt wird... Dann löst es aus irgendeinem Grund eine Ausnahme aus.

INFO: Binding entity from annotated class: com.dataobject.Vehicle
FINE: Import with entity name Vehicle
INFO: Bind entity com.dataobject.Vehicle on table VEHICLE
INFO: Adding secondary table to entity com.dataobject.Vehicle -> MOVEMENT_DATA
FINE: Processing com.dataobject.Vehicle property annotation
FINE: Processing annotations of com.dataobject.Vehicle.id
FINE: Binding column id. Unique false. Nullable false.
FINE: id is an id
FINE: building SimpleValue for id
FINE: Building property id
FINEST: Cascading id with null
FINE: Bind @Id on id
FINE: Processing annotations of com.dataobject.Vehicle.color
FINE: Binding column COLOR. Unique false. Nullable true.
FINE: binding property color with lazy=false
FINE: building SimpleValue for color
FINE: Building property color
FINEST: Cascading color with null
FINE: Processing annotations of com.dataobject.Vehicle.movementData
FINE: Binding column movementData. Unique false. Nullable true.
FINE: Binding component with path: com.dataobject.Vehicle.movementData
FINE: Processing com.dataobject.MovementData property annotation
FINE: Processing annotations of com.dataobject.MovementData.latitude
FINE: Column(s) overridden for property latitude
FINE: Binding column LATITUDE. Unique false. Nullable true.
FINE: binding property latitude with lazy=false
FINE: building SimpleValue for latitude
FINE: Building property latitude
FINEST: Cascading latitude with null
FINE: Processing annotations of com.dataobject.MovementData.longitude
FINE: Column(s) overridden for property longitude
FINE: Binding column LONGITUDE. Unique false. Nullable true.
FINE: binding property longitude with lazy=false
FINE: building SimpleValue for longitude
FINE: Building property longitude
FINEST: Cascading longitude with null
FINE: Processing annotations of com.dataobject.MovementData.speed
FINE: Column(s) overridden for property speed
FINE: Binding column SPEED. Unique false. Nullable true.
FINE: binding property speed with lazy=false
FINE: building SimpleValue for speed
FINE: Building property speed
FINEST: Cascading speed with null
FINE: Processing annotations of com.dataobject.MovementData.timeOfPosition
FINE: Column(s) overridden for property timeOfPosition
FINE: Binding column TIME_OF_POSITION. Unique false. Nullable true.
FINE: binding property timeOfPosition with lazy=false
FINE: building SimpleValue for timeOfPosition
FINE: Building property timeOfPosition
FINEST: Cascading timeOfPosition with null
FINE: Building property movementData
FINEST: Cascading movementData with null
FINE: Processing annotations of com.dataobject.Vehicle.numWheels
FINE: Binding column NUM_WHEELS. Unique false. Nullable true.
FINE: binding property numWheels with lazy=false
FINE: building SimpleValue for numWheels
FINE: Building property numWheels
FINEST: Cascading numWheels with null
INFO: Binding entity from annotated class: com.dataobject.Car
FINE: Binding column id. Unique false. Nullable false.
FINE: Subclass joined column(s) created
FINE: Import with entity name Car
INFO: Bind entity com.dataobject.Car on table CAR
FINE: Processing com.dataobject.Car property annotation
FINE: Processing annotations of com.dataobject.Car.make
FINE: Binding column MAKE. Unique false. Nullable true.
FINE: binding property make with lazy=false
FINE: building SimpleValue for make
FINE: Building property make

Fahrzeug ist die übergeordnete Klasse

/**
 * Entity implementation class for Entity: Vehicle
 *
 */
@Entity
@Table(name="VEHICLE")
@Inheritance(strategy=InheritanceType.JOINED)
@SecondaryTable(name="MOVEMENT_DATA",
            pkJoinColumns = {
                @PrimaryKeyJoinColumn(name = "ID") 
            } 
)
public class Vehicle implements Serializable {

    private int numWheels;
    private String color;
    private int id;
    private MovementData movementData;
    private static final long serialVersionUID = 1L;

    public Vehicle() {
        super();
    }   

    @Embedded
    @AttributeOverrides( {
    @AttributeOverride(
        name = "speed",
        column = @Column(name = "SPEED",
                         table = "MOVEMENT_DATA")
    ),
    @AttributeOverride(
        name = "timeOfPosition",
        column = @Column(name = "TIME_OF_POSITION",
                         table = "MOVEMENT_DATA")
    ),
    @AttributeOverride(
            name = "longitude",
            column = @Column(name = "LONGITUDE",
                             table = "MOVEMENT_DATA")
        ),
   @AttributeOverride(
            name = "latitude",
            column = @Column(name = "LATITUDE",
                             table = "MOVEMENT_DATA")
        )
})
    public MovementData getMovementData() {
        return movementData;
    }
    public void setMovementData(MovementData movementData) {
        this.movementData = movementData;
    }

    @Column(name="NUM_WHEELS")
    public int getNumWheels() {
        return this.numWheels;
    }

    public void setNumWheels(int numWheels) {
        this.numWheels = numWheels;
    }   
    @Column(name="COLOR")
    public String getColor() {
        return this.color;
    }

    public void setColor(String color) {
        this.color = color;
    }   
    @Id    
    public int getId() {
        return this.id;
    }

    public void setId(int id) {
        this.id = id;
    }

}

Auto erweitert Fahrzeug

/**
 * Entity implementation class for Entity: Car
 */
@Entity
@Table(name="CAR")
public class Car extends Vehicle implements Serializable {

    private String make;
    private static final long serialVersionUID = 1L;

    public Car() {
        super();
    }   
    /**
     * @return
     */
    @Column(name="MAKE")
    public String getMake() {
        return this.make;
    }

    /**
     * @param make
     */
    public void setMake(String make) {
        this.make = make;
    }

}

MovementData ist in das Fahrzeug eingebettet

@Embeddable
public class MovementData implements Serializable {

    private double speed;
    private Date timeOfPosition;
    private double latitude;
    private double longitude;
    private static final long serialVersionUID = 1L;

    public MovementData() {
        super();
    }   

    /**
     * @return
     */
    @Column(name="SPEED")
    public double getSpeed() {
        return this.speed;
    }

    /**
     * @param speed
     */
    public void setSpeed(double speed) {
        this.speed = speed;
    }   
    /**
     * @return
     */
    @Column(name="TIME_OF_POSITION")
    public Date getTimeOfPosition() {
        return this.timeOfPosition;
    }

    /**
     * @param timeOfPosition
     */
    public void setTimeOfPosition(Date timeOfPosition) {
        this.timeOfPosition = timeOfPosition;
    }   

    /**
     * @return
     */
    @Column(name="LONGITUDE")
    public double getLongitude() {
        return this.longitude;
    }

    /**
     * @param longitude
     */
    public void setLongitude(double longitude) {
        this.longitude = longitude;
    }
    /**
     * @return
     */
    @Column(name="LATITUDE")
    public double getLatitude() {
        return this.latitude;
    }

    /**
     * @param latitude
     */
    public void setLatitude(double latitude) {
        this.latitude = latitude;
    }   

}

Persistenz-Einheit:

    <properties>
        <!-- The database dialect to use -->
        <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
        <!-- drop and create tables at deployment -->
        <property name="hibernate.hbm2ddl.auto" value="create-drop" />
        <!-- Hibernate Query Language (HQL) parser. -->
        <!-- property name="hibernate.cache.provider_class" value="net.sf.ehcache.hibernate.EhCacheProvider" /-->
        <!-- property name="hibernate.cache.provider_class" value="org.hibernate.cache.JbossCacheProvider" /-->
        <property name ="hibernate.show_sql" value="false" />
        <property name ="hibernate.format_sql" value="false" />
        <property name="hibernate.cache.provider_class" value="net.sf.ehcache.hibernate.SingletonEhCacheProvider" />
    </properties>

Answer 1

Stellen Sie eine Verbindung zu Ihrer Datenbank mit einem geeigneten DB-Client her (Query Browser, MS SQL Managment Studio usw.), um zu überprüfen, ob die Tabellen tatsächlich vorhanden sind oder nicht.

Sie können auch einen Haltepunkt in Ihren Code einfügen, damit Sie genau sehen können, wie die Datenbank in dem Moment aussieht, bevor der Fehler auftritt.

Versuchen Sie, den Wert für hibernate.hbm2ddl.auto wie unten beschrieben auf "create" zu setzen, und ändern Sie auch die Einstellung so, dass die SQL-Datei ausgedruckt wird, damit Sie sehen können, was sie versucht:

<props>
  <!-- some possible values: create, create-drop, update -->
  <prop key="hibernate.hbm2ddl.auto">update</prop>
  <prop key="hibernate.show_sql">true</prop>
  ....
<props>

Lassen Sie mich wissen, was Sie in Ihrer Datenbank sehen.