System.ExecutionEngineException: Attempting to JIT compile method 'ServiceStack.Text.Json.JsonReader

[Mark Swiatek]

In MonoTouch, the following code generates a JIT Exception:

if (Logger.IsInfoEnabled)
Logger.InfoFormat ("Getting URI: {0}", searchUri);

try
{
var courses =
AppConfig.ServiceClient.Get<GolfCourseResponse>(searchUri);
NavigationController.PushViewController(_courseScreen, true);
_courseScreen.LoadData(courses.GolfCourses, "Nearby Courses");
}
catch (Exception ex)
{
if (Logger.IsErrorEnabled)
Logger.Error ("Error getting courses near latitude/longitude",
ex);
using (var alertView = new UIAlertView("Error", ex.Message, null,
"OK", null))
{
alertView.Show();
}
}

The call works fine in the simulator. Any ideas?

Here's the exception dump. Thanks.

INFO [2012-03-17 10:09:07,242] ThirstyGolfer.CourseSearchScreen:
Getting URI: /coursesnear?
Latitude=43.2818858892105&Longitude=-77.7920335472186&Distance=7000
ERROR [2012-03-17 10:09:26,727] ThirstyGolfer.CourseSearchScreen:
Error getting courses near latitude/longitude
System.TypeInitializationException: An exception was thrown by the
type initializer for ServiceStack.Text.Json.JsonReader`1 --->
System.TypeInitializationException: An exception was thrown by the
type initializer for ServiceStack.Text.Json.JsonReader`1 --->
System.ExecutionEngineException: Attempting to JIT compile method
'ServiceStack.Text.Json.JsonReader`1<Thirsty.ServiceModel.Types.CourseTypes>:GetParseFn
()' while running with --aot-only.

at ServiceStack.Text.Json.JsonReader.GetParseFn (System.Type type)
[0x00000] in <filename unknown>:0
at ServiceStack.Text.Json.JsonTypeSerializer.GetParseFn (System.Type
type) [0x00000] in <filename unknown>:0
at
ServiceStack.Text.Common.DeserializeType`1[ServiceStack.Text.Json.JsonTypeSerializer].GetParseMethod
(System.Type type) [0x00000] in <filename unknown>:0
at
ServiceStack.Text.Common.JsReader`1[ServiceStack.Text.Json.JsonTypeSerializer].GetParseFn[GolfCourse]
() [0x00000] in <filename unknown>:0
at
ServiceStack.Text.Json.JsonReader`1[Thirsty.ServiceModel.Types.GolfCourse]..cctor
() [0x00000] in <filename unknown>:0
--- End of inner exception stack trace ---
at ServiceStack.Text.Json.JsonReader.GetParseFn (System.Type type)
[0x00000] in <filename unknown>:0
at ServiceStack.Text.Json.JsonTypeSerializer.GetParseFn (System.Type
type) [0x00000] in <filename unknown>:0
at
ServiceStack.Text.Common.DeserializeType`1[ServiceStack.Text.Json.JsonTypeSerializer].GetParseMethod
(System.Type type) [0x00000] in <filename unknown>:0
at
ServiceStack.Text.Common.JsReader`1[ServiceStack.Text.Json.JsonTypeSerializer].GetParseFn[GolfCourseResponse]
() [0x00000] in <filename unknown>:0
at
ServiceStack.Text.Json.JsonReader`1[Thirsty.ServiceModel.Types.GolfCourseResponse]..cctor
() [0x00000] in <filename unknown>:0
--- End of inner exception stack trace ---
at
ServiceStack.Text.JsonSerializer.DeserializeFromString[GolfCourseResponse]
(System.String value) [0x00000] in <filename unknown>:0
at
ServiceStack.Text.JsonSerializer.DeserializeFromStream[GolfCourseResponse]
(System.IO.Stream stream) [0x00000] in <filename unknown>:0
at
ServiceStack.ServiceModel.Serialization.JsonDataContractDeserializer.DeserializeFromStream[GolfCourseResponse]
(System.IO.Stream stream) [0x00000] in <filename unknown>:0
at
ServiceStack.ServiceClient.Web.JsonServiceClient.DeserializeFromStream[GolfCourseResponse]
(System.IO.Stream stream) [0x00000] in <filename unknown>:0
at
ServiceStack.ServiceClient.Web.ServiceClientBase.Send[GolfCourseResponse]
(System.String httpMethod, System.String relativeOrAbsoluteUrl,
System.Object request) [0x00000] in <filename unknown>:0

[Demis Bellot]

Yeah iOS/MonoTouch doesn't allow JIT and your code looks like it's executing a code path that requires JIT, this normally happens when you try to call  a generic method.

The idea is to tell MonoTouch upfront what generic methods/classes it needs to create upfront so it can pre-compile the support it needs at the AOT stage so it doesn't need it at runtime. This is where I try adding all the generic calls SS.Text needs up front:

https://github.com/ServiceStack/ServiceStack.Text/blob/master/src/ServiceStack.Text/JsConfig.cs#L151

It's likely its missing the code-path that you need. 

Unfortunately I don't have time to look at this myself before the next release is out (and my MonoTouch licence is out of date).

So I would download a fork and try adding to this things you might need / i.e what it errors out on.

--
- Demis

http://twitter.com/demisbellot

http://www.servicestack.net/mythz_blog

[Mark Swiatek]

It was choking on an enumeration, which I would assume is ultimately
an int. Is that still something that would be fixed where you suggest,
or is there a different issue.

On Mar 17, 11:07 am, Demis Bellot <demis.bel...@gmail.com> wrote:
> Yeah iOS/MonoTouch doesn't allow JIT and your code looks like it's
> executing a code path that requires JIT, this normally happens when you try
> to call  a generic method.
>
> The idea is to tell MonoTouch upfront what generic methods/classes it needs
> to create upfront so it can pre-compile the support it needs at the AOT
> stage so it doesn't need it at runtime. This is where I try adding all the

> generic calls SS.Text needs up front:https://github.com/ServiceStack/ServiceStack.Text/blob/master/src/Ser...

> > ServiceStack.Text.Common.DeserializeType`1[ServiceStack.Text.Json.JsonTypeS erializer].GetParseMethod

> > (System.Type type) [0x00000] in <filename unknown>:0
> >  at
>

> > ServiceStack.Text.Common.JsReader`1[ServiceStack.Text.Json.JsonTypeSerializ er].GetParseFn[GolfCourse]

> > () [0x00000] in <filename unknown>:0
> >  at
>
> > ServiceStack.Text.Json.JsonReader`1[Thirsty.ServiceModel.Types.GolfCourse]. .cctor
> > () [0x00000] in <filename unknown>:0
> >  --- End of inner exception stack trace ---
> >  at ServiceStack.Text.Json.JsonReader.GetParseFn (System.Type type)
> > [0x00000] in <filename unknown>:0
> >  at ServiceStack.Text.Json.JsonTypeSerializer.GetParseFn (System.Type
> > type) [0x00000] in <filename unknown>:0
> >  at
>

> > ServiceStack.Text.Common.DeserializeType`1[ServiceStack.Text.Json.JsonTypeS erializer].GetParseMethod

> > (System.Type type) [0x00000] in <filename unknown>:0
> >  at
>

> > ServiceStack.Text.Common.JsReader`1[ServiceStack.Text.Json.JsonTypeSerializ er].GetParseFn[GolfCourseResponse]

> > () [0x00000] in <filename unknown>:0
> >  at
>

> > ServiceStack.Text.Json.JsonReader`1[Thirsty.ServiceModel.Types.GolfCourseRe sponse]..cctor

> > () [0x00000] in <filename unknown>:0
> >  --- End of inner exception stack trace ---
> >  at
> > ServiceStack.Text.JsonSerializer.DeserializeFromString[GolfCourseResponse]
> > (System.String value) [0x00000] in <filename unknown>:0
> >  at
> > ServiceStack.Text.JsonSerializer.DeserializeFromStream[GolfCourseResponse]
> > (System.IO.Stream stream) [0x00000] in <filename unknown>:0
> >  at
>

> > ServiceStack.ServiceModel.Serialization.JsonDataContractDeserializer.Deseri alizeFromStream[GolfCourseResponse]

[Gerry High]

Anyone know if this has been fixed?  I'm still seeing this issue with enums but am running a build of ServiceStack.Text from 2-3 months ago.

[Demis Bellot]

I haven't had a chance to look at it myself but I recall Sergey (@desunit) did some work on it a little while back.

I'd try using a new build from src.

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