JPA Help

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I have a master/detail Entity and when trying to insert into the database I=
 see that the detail tables does not have the master id. I have tried sever=
al ways but no joy. Could someone help me figure this out please


Master Entity
@Entity(name=3D"SensewareMaster")
public class SensewareMaster  implements java.io.Serializable {


	/**
	 *=20
	 */
	private static final long serialVersionUID =3D 4339450175966302338L;
	@Id
	@GeneratedValue(strategy =3D GenerationType.AUTO)
    @Column(name=3D"id", unique=3Dtrue, nullable=3Dfalse)
     private int id;
=E2=80=A6
     @OneToMany(cascade=3DCascadeType.ALL, fetch=3DFetchType.LAZY, mappedBy=
=3D"master")
     private Set<Detail> data;


Detail Entity
@Entity(name =3D "sensewaredata")
public class Detail implements java.io.Serializable {

	/**
	 *=20
	 */
	private static final long serialVersionUID =3D -6427634832997399496L;
	@Id
	@GeneratedValue(strategy =3D GenerationType.AUTO)
	@Column(name =3D "id", unique =3D true, nullable =3D false)
	private int id;
		=E2=80=A6
	@ManyToOne(fetch =3D FetchType.LAZY)
	@JoinColumn(name =3D "master_id")
	private Master master;


json data attempted to being saved:
{
  "data":[{
    "pkt":999,"ts":999,"raw":999,"value":99.9
  },{
    "pkt":9991,"ts":9991,"raw":9991,"value":99.2
  }],
  "sn":"XXXXX",
  "site":"XXX",
  "location":"XXX",
  "mod":999,
  "pos":99,
  "sid":99,
  "type":"TXXX",
  "cid":999,
  "name":"XXXXX",
  "transform":"",
  "ts":9999999,
  "unit":"X",
  "subscription_id":"ABC-BBB"
}


After calling save, looking at the db, the detail table has 2 records as ex=
pected except that the master_id is not populated.


Any help would be greatly appreciated.


Thanks
Mike Barnes

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