Getting Object Reference not set to instance in serializetoJson

ServiceStack.Text
1

Pretty simple object… code below the stack here, why is GetDbConnection being called!!! Using 4.0.62 also tried older version 4.0.4x

at ServiceStack.ServiceStackHost.GetDbConnection (IRequest req) [0x00085] in :0
at ServiceStack.Service.get_Db () [0x00016] in :0
at (wrapper dynamic-method) System.Object:lambda_method (System.Runtime.CompilerServices.Closure,ShipNow.Common.UIMessage)
at ServiceStack.Text.Common.WriteType2[T,TSerializer].WriteProperties (System.IO.TextWriter writer, System.Object value) [0x0013e] in <filename unknown>:0 at ServiceStack.Text.Json.JsonWriter1[T].WriteRootObject (System.IO.TextWriter writer, System.Object value) [0x0000b] in :0
at ServiceStack.Text.JsonSerializer.SerializeToString[T] (ServiceStack.Text.T value) [0x000c8] in :0
at ShipNow.Common.UIMessage.toJson () [0x00003] in /Users/kevin/Projects/ShipNow/ShipNow.Common/UIMessage.cs:66

using System;
using ServiceStack;
using ServiceStack.Text;


namespace ShipNow.Common
{
	public class UIMessage : Service
	{
		
		private IServerEvents ServerEvents { get; set; }

		public bool successfull { get; set; }
		public string message { get; set; }
		public string objectData { get; set; }


		private string _channel { get; set; }
		private string _selector { get; set;}

		public UIMessage()
		{

		}

		public UIMessage(string channel, string selector, bool success, string _message, Object objData)
		{
			successfull = success;
			message = message;
			_channel = channel;
			_selector = selector;

			if (objData != null)
			{
				try
				{
					objectData = JsonSerializer.SerializeToString(objData);
				}
				catch (Exception e)
				{
					Util.ServiceLog.Error("Error serializing object for UIMEssage", e);

			}
			}


		
		}

		public void notify()
		{
			if (!_channel.IsNullOrEmpty() && !_selector.IsNullOrEmpty())
			{
				ServerEvents.NotifyChannel(_channel, _selector, this.toJson());
			}
			else {
				Util.ServiceLog.Warn("TRied to notify without a channel/selector");
			}

		}


		public string toJson()
		{
			try
			{
				return JsonSerializer.SerializeToString(this);
			}
			catch (Exception e)
			{
				Util.ServiceLog.Error("Error serializing object for UIMEssage", e);
				return "{\"message\":\"error serializing\"}";
			}
			//return JsonSerializer.SerializeToString(this);
		}
	}
}
2

Just realized its a Service subclass… not a simple object. will try to compartmentalize a little better was just being lazy getting the IServerEvents…

3

The StackTrace suggests you’re trying to serialize the entire UIMessage Service? You definitely don’t want to be calling:

return JsonSerializer.SerializeToString(this);

On a Service or anything else really since it suggests you’re trying to serialize a class with a behavior which will likely lead to issues like this. The result is what’s causing the Serializer to serialize Db public property which is what calls AppHost.GetDbConnection().

4

Ya, figured that out… can’t serialize it. Have another related question about getting ServerEvents client, will post a new topic…