@NamedEntityGraph
@Entity
public class Phonenumber{
@Id
protected String number;
}
protected PhoneTypeEnum type;
...

@Entity
@NamedEntityGraph(
        name = "CustomersWithOrderId",
        includeAllAttributes=false,
        attributeNodes = {
                @NamedAttributeNode(value = "name"),
                @NamedAttributeNode(value = "orders", subgraph = "ordersGraph")
        },
        subgraphs = {
                @NamedSubgraph(
                        name = "ordersGraph",
                        type = OrderEntity.class,
                        attributeNodes = {
                                @NamedAttributeNode(value = "id"),
                                @NamedAttributeNode(value = "campaignId")
                        }
                )
        }
)
public class CustomerEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "customer_seq")
    @SequenceGenerator(name = "customer_seq", sequenceName = "CUSTOMER_SEQ_ID_SEQ", allocationSize = 1)
    private long id;

    @Column
    private String name;

    @Column
    private int numberOfPurchases;

    @OneToMany(mappedBy = "customer", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private Set<OrderEntity> orders;

    @OneToMany(mappedBy = "customer", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private Set<AddressEntity> addresses;

    select
        customeren0_.id as id1_1_0_,
        orders1_.id as id1_2_1_,
        customeren0_.name as name2_1_0_,
        customeren0_.numberOfPurchases as numberOf3_1_0_,
        orders1_.campaignId as campaign2_2_1_,
        orders1_.CUSTOMER_ID as CUSTOMER4_2_1_,
        orders1_.timestamp as timestam3_2_1_,
        orders1_.CUSTOMER_ID as CUSTOMER4_1_0__,
        orders1_.id as id1_2_0__ 
    from
        CustomerEntity customeren0_ 
    left outer join
        OrderEntity orders1_ 
            on customeren0_.id=orders1_.CUSTOMER_ID