Again with JPA not making sense

B sa_id(key) s_id user pwd.

@Entity class A...{
@OneToMany(fetch=FetchType.EAGER)
@JoinTable( name="A_B",
joinColumns={@JoinColumn(name="a_id",
table="a",unique=false)},
inverseJoinColumns={@JoinColumn(name="b_id",
table="b", unique=true)} ) Collection
getB(){...} }

@Entity
class A{
...
@OneToMany(fetch=FetchType.EAGER, mappedBy="s")
Collection<B> x;
}

@Entity
class B{
@ManyToOne
A s;
}

With these tables:
A
s_id(key) name cli type

B
sa_id(key) s_id(the keys from A) user pwd.