Updating entities in bidirectional relationships causes circular error - jackson

Question

I have a bidirectional OneToMany relationship between the entites Basket and ProductOrder.
#OneToMany(mappedBy = "basket", cascade = CascadeType.ALL)
#Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
private Set<ProductOrder> products = new HashSet<>();
and
#ManyToOne
#JsonIgnoreProperties("products")
private Basket basket;
When I add a new productOrder to the basket and call the update method on the basket. The productOrder is being created but gets no reference to the basket which results in the basket having no productOrders!
I tried setting the basket from the productOrder but then it ends in a endless circle and I get:
ERROR TypeError: Converting circular structure to JSON
So my question is, how to handle bidirectional relationships in jhipster?
This is how I would like to update my basket:
test-component.ts
intoBasket(product, amount) {
this.productOrder = new ProductOrder();
this.productOrder.product = product;
this.productOrder.amount = amount;
this.basketService.find(+this.account.id).subscribe((res: HttpResponse<Basket>) => {
this.basket = res.body;
this.productOrder.basket = this.basket;
this.basket.products.push(this.productOrder);
this.basketService.update(this.basket).subscribe((res: HttpResponse<Basket>) => {
console.log("test");
});
});
}
thank you!
Update
I moved some logic from the frontend to the backend:
BasketService.java
public Basket save(Basket basket) {
log.debug("Request to save Basket : {}", basket);
log.info(basket.getProducts().toString());
basket.getProducts().stream().forEach(p -> p.setBasket(basket));
return basketRepository.save(basket);
}
this saves the ProductOrders properly with a reference to the Basket. But When I try to log the products from the basket in the frontend I get null which is odd because the method
this.basketService.update(this.basket).subscribe((res: HttpResponse<Basket>) => {
console.log(res.body.products);
});
actually returns the basket filled with the new product. But it doesn't seem to save it because when I request that specific basket "/baskets/39" the response is missing the products:
{id: 39, totalPrice: 0, customerId: 39, products: null}
Update 2
okay, i restarted the product microservice which is responsible for these entities and now everything works fine. I didn't know I had to restart it but that's good to know I guess.