relation « Default « JPA Q&A

1. JPA: default column name mapping for @ManyToOne relations    stackoverflow.com

When we have a class:

@Entity
Order implements Serializable {
    @Id
    private Integer id;
    ...
}

@Entity
OrderLine implements Serializable {
    @Id
   ...

2. Parent/Child relation with default of 0 instead of null    forum.hibernate.org