ArcObjects SDK for .NET JSONToFeatures fails when large JSON file is used

Question

I have a large JSON file which I download from ArcGIS Server REST (size is 140MB). When I try to execute the JSONToFeatures Geoprocessing tool on this file I get an error.

Code: (call below method with arguments toolName="JSONToFeatures", a path for input json and a path for output SHP file).

 private object RunTool(string toolName, object[] parameters) {
 IVariantArray gpParams = new VarArrayClass();
 IGeoProcessorResult gpResult = new GeoProcessorResult();
 foreach (object o in parameters)
 gpParams.Add(o);
 object rev = new object();
 try {
 gpResult = Geoprocessor.Execute(toolName, gpParams, null);
 return gpResult.ReturnValue;
 } 
 catch (COMException comEx) {
 throw new Exception(Geoprocessor.GetMessages(ref rev), comEx);
 } 
 finally {
 ReleaseObjects(new object[] { gpParams, gpResult });
 }
 }

When executed returns the following error: Executing: JSONToFeatures input_path output_path Start Time: Thu Jan 31 14:32:43 2019 ERROR 999998: Unexpected Error. Failed to execute (JSONToFeatures). Failed at Thu Jan 31 14:32:45 2019 (Elapsed Time: 1,48 seconds)

When I execute JSONToFeatures tool from within ArcDesktop ModelBuilder execution proceeds successfully.

Please note that on small files of size 1-10 MB (which is the normal size of files processed by the code above) there are no problems.

This error is very generic. How do I need to proceed?

• Berend: Could you try this on a (much) smaller JSON file, and add the results to your question?
• Andreas Andreou: Yes the code runs successfully on smaller files. In fact usually the files it handles are between 1 and 10 MB. This file is an exception.
• Kirk Kuykendall: What do you see if you register a geoprocessing event handler? gis.stackexchange.com/a/1683/59