答案1：
@Size(max=10)
private List<Comment> commentList;
答案2 ：（仅是这样的例子）
public class A{
@Id
@GeneratedValue
private Integer id;
private String uuid;
...
}
其他班级
public class B{
@Id
@GeneratedValue
private Integer id;
private String uuidOfA;
@ManyToOne
@JoinColumnsOrFormulas({
@JoinColumnOrFormula(formula=@JoinFormula(value="(SELECT a.id FROM A a WHERE a.uuid = uuid)", referencedColumnName="id")),
@JoinColumnOrFormula(column = @JoinColumn("uuidOfA", referencedColumnName="uuid"))
})
private A a;
}
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