Spring Data JPA实体中的构造函数

Question

我想要一个带有问题和答案地图的实体测试（一个问题允许多个答案）。这是表格（固定）：

_____________
|Question   |
|-----------|
|+ id       |
|+ question |
|___________|

_____________
|Answer     |
|-----------|
|+ id       |
|+ answer   |
|___________|

_____________
|wrong      |   -- ASSOCIATION WITH TRICKY ANSWERS
|-----------|
|+ answer   |
|+ question |
|___________|

_____________
|exact      |   -- ASSOCIATION WITH CORRECT ANSWERS
|-----------|
|+ answer   |
|+ question |
|___________|

_____________
|Test       |
|-----------|
|+ id       |
|___________|

_____________
|Selection  |
|-----------|
|+ id       |
|+ test     |
|+ question |
|___________|

_____________
|reply      |
|-----------|
|+ selection|
|+ answer   |
|___________|

在我的实体测试中，我想放置那些行，但代码不能编译......

@OneToMany
@JoinTable(
        name = "selection", 
        joinColumns = @JoinColumn(name = "fk_test"), 
        inverseJoinColumns = @JoinTable(
                name = "reply", 
                joinColumns = @JoinColumn(name = "fk_selection"), 
                inverseJoinColumns = @JoinColumn(name = "fk_answer")))
private Map<Question, List<Answer>> selections;

我不喜欢有实体选择，它非常“丑陋”＃34;我在网上找不到解决方案......