Mapping & fetching entities with composite keys using spring data JPA - jpa

Question

I have Spring MVC and Data JPA. I am trying to do mapping tables I have. The structure is like below:
Device
--------------
PK deviceId
deviceName
Setting
--------------
PK deviceId
PK packageName
PK name
value
And I have classes for those tables:
#Entity
public class DeviceSetting implements Serializable {
#EmbeddedId
private String deviceId
private String deviceName;
#ManyToOne
#JoinColumn(name="deviceId", referencedColumnName="deviceId", insertable=false, updatable=false)
private Device device;
//Setters and Getters
}
#Embeddable
public class DeviceSettingPk implements Serializable {
private String deviceId;
private String packageName;
private String name;
public DeviceSettingPk(){}
public DeviceSettingPk(String deviceId, String packageName, String name) {
super();
this.deviceId = deviceId;
this.packageName = packageName;
this.name = name;
}
//Setters and Getters
}
#Entity
public class Device implements Serializable {
private static final long serialVersionUID = 1L;
#NotEmpty
#Id
#Column(name="deviceId")
private String deviceId;
private String deviceName;
//Getters and Setters
}
But I did not get device data when I put device and setting data has same deviceId and queried DeviceSetting by using repository.findOne(deviceId);
What else do I need to do to get the device data? Any advice would be helpful. Thanks.

Answer 1

Change the mapping as follows.
#Entity
public class DeviceSetting implements Serializable {
#EmbeddedId
private DeviceSettingPk deviceSettingId;
#ManyToOne
#JoinColumn(name="deviceId", referencedColumnName="deviceId", insertable=false, updatable=false)
private Device device;
//Setters and Getters
}
And then use the following code to lookup.
DeviceSettingPk id = new DeviceSettingPk(deviceId, packageName, name);
// use the deviceSettingRespository to lookup
repository.findOne(id);