Question

I have a simple JPA project running (with IBM RAD 7.5 on WebSphere 7).

I have a Customer that has many Orders. Looks like this …

@Entity
public class Customer /* in table CC_CUSTOMER */
  @Id
  BigDecimal customerId;
  @OneToMany(fetch=FetchType.EAGER)
  private List<Order> orderList;

…

@Entity
public class Order /* in table CC_ORDER */
  @Id
  BigDecimal orderId;
  Customer customer;

The problem I have is when I try to retrieve a Customer, I get an error because the SQL that’s being generated by JPA contains a select for a non-existant table called: CC_CUSTOMER_CC_ORDER

What am I doing wrong?

Thanks!

Rob

Answer 1

You have a missing @ManyToOne annotation at Customer customer; and mappedBy=”customer” at @OneToMany annotation

Customer entity

@OneToMany(fetch=FetchType.EAGER, mappedBy="customer")
private List<Order> orderList;

Order entity

@ManyToOne
Customer customer;

Because of that JPA thinks that your relationship is unidirectional and this is solved by join table named CC_CUSTOMER_CC_ORDER. If you let your provider generate the schema the table should be generated.