public class Blobx {

    private String name;
    private BlobKey blobKey;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Key id;

    //getters and setters 
 }

public class Userx  {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Key id;
    private String name;
    @OneToMany
    private List<Blobx> blobs;
    //getters and setters 
}

while persiting the above Userx entity object i am encountering

java.lang.IllegalStateException: Field "entities.Userx.blobs" contains a persistable object that isnt persistent, but the field doesnt allow cascade-persist!