Error when trying to save entities with mapping in Spring-JPA

I have the following entity relationship:

@Entity
@Table(name="order_info")
public class OrderInfo{
    @OneToMany(mappedBy="orderInfo",fetch=FetchType.EAGER,cascade=CascadeType.ALL)
    @JsonIgnore
    private List<OrderItem> orderItems;
}


@Entity
@Table(name="reason_codes")
public class ReasonCode{
    //bi-directional many-to-one association to OrderItem
    @JsonIgnore
    @OneToMany(mappedBy="reasonCode",fetch=FetchType.EAGER,cascade=CascadeType.ALL)
    private List<OrderItem> orderItems;
}


@Entity
@Table(name="order_item")
public class OrderItem{
    //bi-directional many-to-one association to OrderInfo
    @ManyToOne
    @JoinColumn(name="order_info_id", nullable=false)
    private OrderInfo orderInfo;

    //bi-directional many-to-one association to ReasonCode
    @ManyToOne
    @JoinColumn(name="reason_code_id", nullable=false)
    private ReasonCode reasonCode;
}

Each OrderInfo has many OrderItem, each ReasonCode can be mapped to multiple OrderItems, and each OrderItem MUST have 1 OrderInfo, and 1 ReasonCode.

And finally, the class to set everything up:

class setup{

...
List<OrderItem> orderItems = new ArrayList<OrderItem>();


for(...){
    OrderItem item = new OrderItem();
    ReasonCode rrCode = rcRepostory.findOne("2");
    item.setReasonCode(rrCode);
    orderItems.add(item);
}


OrderInfo orderInfo = new OrderInfo();
orderInfo.setOrderItems(orderItems);
orderInfoRepo.save(orderInfo);
}

Now, when I try to save the orderInfo entity, I get the following error:

Not-null property references a transient value - transient instance must be saved before current operation : model.OrderItem.reasonCode -> model.ReasonCode

Basically, what I wan to do is, when I save OrderInfo, I want the OrderItems to be saved as well.

From the many posts that I saw online, adding the fetch as eager, and cascade on the many-to-one mapping should resolve this. However, I still face the issue even after adding them.

The ReasonCode already exists in the database. What is the problem here?

Thanks.