Spring Boot : Error :Cannot call sendError() after the response has been committed - spring

Question

I am getting this error .
Cannot call sendError() after the response has been committed
Can someone help me figure out why?.
#Entity
public class Product {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
#OneToOne(
fetch = FetchType.LAZY,
cascade = CascadeType.ALL
)
#JoinColumn(name = "details_id")
private Details details;
//Getters and setters left out for brevity
}
#Entity
public class Details {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
private String name;
private String description;
private float price;
private float discount;
#OneToOne(mappedBy = "details")
private Product product;
}
#RestController
public class ProductController {
#Autowired
ProductRepository productRepository;
#GetMapping("/getAllProducts")
public Iterable<Product> getAllProducts(){
return productRepository.findAll();
}
}
#RestController
public class DetialsController {
#Autowired
ProductRepository productRepository;
#Autowired
DetailsRepository detailsRepository;
#PostMapping("/details")
public Details addDetails(#RequestBody Details details) {
Product newProduct = new Product();
newProduct.setDetails(details);
productRepository.save(newProduct);
return detailsRepository.save(details);
}
}
I am able to make the POST call to /details; for adding details successfully. But when i make GET call to /getAllProducts, I am getting this error
Cannot call sendError() after the response has been committed

Answer 1

This is an issue with bidirectional relationships, as they hold references to each other, at deserialization, Jackson runs in an infinite loop. My first suggestion would be adding #JsonIgnore to one end of the relation.
#OneToOne(mappedBy = "details")
#JsonIgnore
private Product product;
Afterward, if that solved your issue, you can look over #JsonManagedReference/#JsonBackReference and #JsonIdentityInfo.
You can also look over this link for more insight

Answer 2

You can use this :
#Entity
public class Product {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
#JsonBackReference(value = "details_id")
#OneToOne(
fetch = FetchType.LAZY,
cascade = CascadeType.ALL
)
#JoinColumn(name = "details_id")
private Details details;
//Getters and setters left out for brevity
}
#Entity
public class Details {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
private String name;
private String description;
private float price;
private float discount;
#JsonManagedReference(value = "details")
#OneToOne(mappedBy = "details",,cascade=CascadeType.ALL)
private Product product;
}