I have 3 classes: A, B, C

class A {
private HashMap<String, B> Bs;
@OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.PERSIST, mappedBy = "a")
public HashMap<String, B> getBs() {
return Bs;
}
}

class B {
Long id;
A a;
C c;
@OneToOne
@JoinColumn(name="cId", nullable=false)
public C getC() {
return c;
}
}

class C {
@Id
String name;
......
}

I want to fetch A and at the same time eager fetch B. I also want to use c.name as the hashmap key.(c.name is in the table B as cId) But I don't want to eager fetch C, because C has many other attributes which i don't need. Is it possible? If yes, how can do it? (I didn't use mapkey because it will use class C as the key which is not what i want. maybe there is another way using mapkey that can achieve my goal)

Thanks in advance