Greetings,

I have a many-to-one relationship, which when I attempt saving, generates "PersistentObjectException: detached entity passed to persist", even when unmodified. The Cluster object contains the list of Component objects. Initially, I was adding components to the list and was getting PersistentObjectException, so I attempted to save the retrieved object without altering and I'm still getting the exception.

Cluster cluster = clusterDao.findbyId(id);
// cluster.getComponens().add(component);
entityManager.merge(cluster);

The relationship is defined as

@Entity
@Table(name = "CLUSTERS_T")
public class Cluster extends BaseEntity implements Serializable {

@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE,generator="CLUSTER_ID_SEQ")
@SequenceGenerator(name="CLUSTER_ID_SEQ",
sequenceName="IRG_CLUSTER_ID_SEQ",allocationSize=1)
@Column(name="CLUSTER_ID")
private Long id;

@OneToMany(cascade = CascadeType.ALL,
fetch = FetchType.LAZY,
mappedBy="cluster",
targetEntity=Component.class)
@JoinColumn(name="CLUSTER_ID", referencedColumnName="CLUSTER_ID")
private List<Component> components;
....
}

@Entity
@Table(name = "CLUSTER_COMPONENTS_T",
uniqueConstraints =@UniqueConstraint(columnNames={"CLUSTER_ID", "SRG_CODE", "SRG_FLEX", "SRA_DESIGNATOR", "SRA_FLEX"}))
public class Component extends BaseEntity implements Serializable{
private static final long serialVersionUID = 9192345415949493620L;
@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE,generator="COMPONENT_ID_SEQ")
@SequenceGenerator(name="COMPONENT_ID_SEQ",
sequenceName="CLUSTER_COMPONENTS_ID_SEQ",allocationSize=1)
@Column(name = "CLUSTER_COMPONENT_ID", nullable = false)
private Long clusterComponentID;

@Column(name="CLUSTER_ID", length=9, nullable=false, insertable=false, updatable=false)
private Long clusterId;
....
@ManyToOne()
@JoinColumn(name="CLUSTER_ID", referencedColumnName="CLUSTER_ID")
private Cluster cluster;
....
}

Any suggestions why can't I save even unmodified object? Any suggestions are greatly appreciated.

-aaton