Newtonsoft Json - OutOfMemoryException

Question

All,

Environment: ASP.net 2.0, Nhibernate 3.3, Json.net (latest, 6.x)

I am using latest version of Newtonsoft.Json library. When I load an entity using nhibernate (my entities reference other entities and are loaded lazily) I receive either an out of memory exception or stackoverflow exception.

Code for outofmemory exception:

JsonSerializerSettings settings = new JsonSerializerSettings();
    settings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
    settings.PreserveReferencesHandling = PreserveReferencesHandling.Objects;
    string json = JsonConvert.SerializeObject(container.DataItem, settings);

Code for stackoverflow exception:

JsonSerializerSettings settings = new JsonSerializerSettings();
    settings.ReferenceLoopHandling = ReferenceLoopHandling.Serialize;
    settings.PreserveReferencesHandling = PreserveReferencesHandling.Objects;
    string json = JsonConvert.SerializeObject(container.DataItem, settings);

People have these issues but there seems to be no solution. I see responses such a your graph is to large or too deep but my object graph is small,- I just call the code above lots of times (once per each object). I need a fix for this.

Are you sure that your object graph is small? Are you sure that it doesn't continually traverse from one lazy-loaded collection to another, gradually loading the entire database? — Andrew Shepherd
– Andrew Shepherd, Commented Sep 19, 2014 at 10:38
I am going to confirm this next week,- but briefly looking at it I saw no issue. — ActiveX
– ActiveX, Commented Sep 19, 2014 at 16:26
I just verified my object graph, it is not the object itself but the returned proxy that is the cause (See answer below). — ActiveX
– ActiveX, Commented Sep 24, 2014 at 16:09

Firo · Accepted Answer · 2014-09-23 09:46:05Z

3

you are using lazy loading so NHibernate hands back proxies here and there and these proxies have references to a System.Type object which will have endless loops and also a reference to the session and sessionfactory which will be heavy on its own, check NHibernate.Proxy.INHibernateProxy.

So either:

eager load the things to serialize or
specify directly which properties to serialize or
don't serialize entities alltogether

answered Sep 23, 2014 at 9:46

Firo

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1 Comment

ActiveX Over a year ago

Thanks for the great answer. I never looked in detail at the proxy class but that makes sense now.

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