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A possible object cycle was detected which is not supported

By : daozhewrr
Date : September 15 2020, 05:00 AM
will be helpful for those in need _repo.GetRoles(); is not using await keyword
this var roles = _repo.GetRoles();
code :
    public  async Task<IActionResult> Get()
        var roles = **await** _repo.GetRoles();
        return new JsonResult(roles);
public List<RoleMaster> GetRoles()
        var roles =  db.RoleMaster.AsNoTracking().ToList();
        return roles;
    catch (Exception)

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A cycle in object graph detected in JPA

By : CoderOnStartups
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I suppose you are using some ORM to fetch data from database and then serialize it and send via web service. So when you fetch list of BlogGadgets they have Blogs in it, but the same Blogs have a list of the same BlogGadgets and so on...
Thats called circular reference and its very common to have them at your object model but when you want to send it on wire you need to make sure that object graph you have is a tree, at least for serializer you are using.
code :
public class BlogGadgetDto 
  public int GadgetId {get;set;}
  public BlogSmallDto Blog {get;set;}
  // and so on

public class BlogSmallDto 
  public int BlogId {get;set;}
  public string BlogName {get;set;}
  // and so on

JAXB A cycle is detected in the object graph

By : user2715820
Date : March 29 2020, 07:55 AM
it fixes the issue As you mentioned in your question EclipseLink MOXy (I'm the tech lead) has the @XmlInverseReference annotation to solve the problem of bidirectional relationships. As of EclipseLink 2.4 MOXy can produce/consume JSON.
For More Information

JAXB: A cycle is detected in the object graph

By : Jagrati Tak
Date : March 29 2020, 07:55 AM
With these it helps Your beans refer to each other: CategoryEntity.news contains at least one NewsEntity whose property categories contains the aforementioned CategroyEntity. Trying to output this as an XML would lead to an endless circle. Depending on what your "leading" Entity is you have to mark either categories or news as @XmlTransient.

.Net Core 3.0 possible object cycle was detected which is not supported

By : user3469901
Date : March 29 2020, 07:55 AM
seems to work fine I have tried your code in a new project and the second way seems to work well after installing the package Microsoft.AspNetCore.Mvc.NewtonsoftJson firstly for 3.0
code :
    .AddNewtonsoftJson(options =>
    options.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore

JsonException: A possible object cycle was detected which is not supported. This can either be due to a cycle or if the

By : antoniomtz
Date : March 29 2020, 07:55 AM
it helps some times In my web api when i run project for get data from database got this error .net core 3.1 , this is happening because your data have a reference loop.
code :
// this example creates a reference loop
var p = new Product()
        ProductCategory = new ProductCategory() 
           { products = new List<Product>() }
    p.ProductCategory.products.Add(p); // <- this create the loop
    var x = JsonSerializer.Serialize(p); // A possible object cycle was detected ...
          options => {
           options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore; 
// if you not using .AddMvc use these methods instead 
// for manual serializer
var options = new JsonSerializerOptions
    ReferenceHandling = ReferenceHandling.Preserve

string json = JsonSerializer.Serialize(objectWithLoops, options);

// -----------------------------------------
// for asp.net core 3.1 (globaly)
  .AddJsonOptions(o => {
       .ReferenceHandling = ReferenceHandling.Preserve  
public class Product
    public int Id { get; set; }
    public string Name { get; set; }
    public string ProductText { get; set; }

    public int ProductCategoryId { get; set; }
    // [JsonIgnore] HERE or
    public virtual ProductCategory ProductCategory { get; set; }

public class ProductCategory
    public int Id { get; set; }
    // [JsonIgnore] or HERE
    public ICollection<Product> products {get;set;}
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