Hibernate @OneToOne Mapping on an Entity Leads to Lazy Initialization

Hibernate ORM
1

I have an Entity A which is having an @OneToOne association on Entity B. When ever trying to update Entity A it is resulting in LazyInitializationException

@Entity
@Table(name = "A")
public class A {
private B b;

@OneToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
	@JoinColumn(name = "bId", foreignKey = @ForeignKey(name="FK_A_B_id"))
	public B getb() {
		return b;
	}

public void setB(B b) {
		this.b= b;
	}

While trying to update Entity A with spring the Controller throws LazyInitializtionException. Entity B is an optional value in the table

Thanks for the help!!