Identity issue for EJB3.0 Entity along with Hibernate HBM configuration

[Bhavesh Dak]

Hello Ranchers,

I came across a scenario where I have to user Hibernate hbm files along with Annotated EJB3.0 Entity Beans where I am facing an issue while retrieving entity configured as hbm file.

Issue : The identity value of the entity is coming with default '0' value set where actual value of id should be primary key value stored in database.

For understanding it well please refer following code:

Annotated abstract Entity:

@MappedSuperclass
public abstract class BaseEntity implements Serializable {

	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	@Column(name = "id")
	private long id;
	
        @Version
	@Column(name = "VERSION", nullable=false)
	private int version = 0;
	

	public BaseEntity() {
		super();
	}   

	public long getId() {
		return this.id;
	}

	public void setId(long id) {
		this.id = id;
	}
	
	public int getVersion() {
	
		return version;
	}
	
	public void setVersion(int version) {

		this.version = version;
	}
	
}

Entity Configured via hbm file :

/**
 * @author bhaveshsh
 *
 */
public class Device extends BaseEntity {
	
	private String description;
	private DeviceType deviceType;
	
	private Set<User> deviceUsers;

	
	public String getDescription() {
	
		return description;
	}

	
	public void setDescription(String description) {
	
		this.description = description;
	}

	
	public DeviceType getDeviceType() {
	
		return deviceType;
	}

	
	public void setDeviceType(DeviceType deviceType) {
	
		this.deviceType = deviceType;
	}

	
	public Set<User> getDeviceUsers() {
	
		return deviceUsers;
	}

	
	public void setDeviceUsers(Set<User> deviceUsers) {
	
		this.deviceUsers = deviceUsers;
	}
}

Hbm Configuration file : "device.hbm.xml"

<hibernate-mapping>

	<class name="com.sample.ejb.entities.Device" table="device_master" dynamic-update="true">
		
		<id column="ID" type="long">
			<generator class="native" />
		</id>
		
		<property name="description" type="java.lang.String" column="DEVICE_DESCRIPTION" />
		
		<property name="deviceType" not-null="true" column="DEVICE_TYPE">
			<type name="com.sample.ejb.entities.GenericEnumUserType">
				<param name="enumClass">com.sample.ejb.entities.DeviceType</param>
			</type>
		</property>
		
		<set name="deviceUsers" lazy="true" inverse="true" table="user_device_map">
			<key column="DEVICE_ID"></key>
			<many-to-many class="com.sample.ejb.entities.User" column="USER_ID"></many-to-many>
		</set>
		
	</class>
</hibernate-mapping>

I am using stateless session beans for implementation of service and dao layers.

following is the code through which I am trying to fetch an instance of Device.

	Query query = entityManager.createQuery("from Device as device where device.id = :deviceId");
		query.setParameter("deviceId", id);
		Device device = (Device) query.getSingleResult();

Problem: Code mentioned above works fine but the id value doesn't populate properly and come up as default '0' value.
Can anybody figure it out why it is happening?

Regards,
Bhavesh Shah