在JPA中，我有2个实体：Entry和Comment。条目包含两个Comment对象集合。

@Entity
public class Entry {
    ...

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @IndexColumn(base = 1, name = "dnr")
    private List<Comment> descriptionComments = new ArrayList<Comment>();

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @IndexColumn(base = 1, name = "pmnr")
    private List<Comment> postMortemComments = new ArrayList<Comment>();

    ...
}

为了存储此类对象，JPA + Hibernate创建“ Entry”表，“ Comment”表和单个“ Entry_Comment”：

create table Entry_Comment (Entry_id integer not null, postMortemComments_id integer not null, pmnr integer not null, descriptionComments_id integer not null, dnr integer not null, primary key (Entry_id, dnr), unique (descriptionComments_id), unique (postMortemComments_id))

对象的存储失败，descriptionComments_id并且postMortemComments_id不能同时为“非null”。

如何使用JPA + Hibernate存储包含两个相同类型的集合的对象？