How to code Spring JPA onetomany relation - spring

Question

I am new to Spring programming and trying the below example with one to many relationship between BID and BIDITEM classes. I am not sure whether the BIDITEM data is saved, as when I tried to retrieve the BID, I am getting only BID data and not BIDITEM data. Do we need to have a repository even for BIDITEM class. I can see that complete BID JSON string, along with BIDITEM is received in create method.
Could you please go through it, and let me know what is wrong with it.
#Entity
#Table(name = "bid")
public class Bid {
#Id
private String title;
#Column
private long startDate;
#Column
private long endDate;
#OneToMany(mappedBy = "myBid", cascade = {CascadeType.ALL})
private List<BidItem> bidItems = new ArrayList<BidItem>();
//Constructor, getter and setter methods go here
}
#Entity
#Table(name="biditem")
public class BidItem
{
#Id
private String item;
#Column
private String desc;
#Column
private double minAmt;
#ManyToOne
#JoinColumn(name = "title")
private Bid myBid;
//Constructor, getter and setter methods go here
}
public interface BidRepository extends CrudRepository<Bid, String> {
//Tried even JpaRepository
}
public class BidService {
ObjectMapper mapper = new ObjectMapper();
#Autowired
private BidRepository bidRepo;
public Bid create(String bidJson) throws JsonParseException, JsonMappingException, IOException
{
Bid bid = mapper.readValue(bidJson, Bid.class);
// bidJson string has below string
// {"bidItems":[{"item":"item1","desc":"item1","minAmt":"999"}],
// "title":"bid1","startDate":"D1","endDate":"D5"}
Bid savedBid = bidRepo.save(bid);
return savedBid;
}
public Bid findByID(String title)
{
Bid bid = bidRepo.findOne(title);
return bid;
}
}