Rodrigo Guerreiro

"The purpose of a programming system is to make a computer easy to use", in The Mythical Man-Month
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REMEMBER: XmlDocument isn't Serializable

This post is more link a note to myself :)

Yesterday I've spent the entire afternoon struggling with this error:

Type 'System.Xml.XmlDocument' in Assembly 'System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable.

The solution is very simple: if you're using, in any of your orchestrations, assemblies that have a XmlDocument type field, than, please, mark it with the attribute NonSerialized. The problem is that when an orchestration is going to be dehydrated, the BizTalk engine is going to serialize every variables (that's why any of your custom classes, that aren't static, must be marked with the attribute Serializable). If, for instance, you have a variable inside your orchestration that is an instance of a class that has a XmlDocument field then you'll get something like this:

Uncaught exception (see the 'inner exception' below) has suspended an instance of service '<the instantiated orchestration>(bafd7e78-dd0b-0792-2fa9-83c40dc63946)'.
The service instance will remain suspended until administratively resumed or terminated.
If resumed the instance will continue from its last persisted state and may re-throw the same unexpected exception.
InstanceId: 201c9481-4591-404f-8ccd-35ab02a2522d
Shape name:
ShapeId: 79491911-f2dc-4d2e-a105-0dc724523c5b
Exception thrown from: segment -1, progress -1
Inner exception: Type 'System.Xml.XmlDocument' in Assembly 'System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable.
Exception type: SerializationException
Source: mscorlib
Target Site: System.Reflection.MemberInfo[] InternalGetSerializableMembers(System.RuntimeType)
The following is a stack trace that identifies the location where the exception occured

   at System.Runtime.Serialization.FormatterServices.InternalGetSerializableMembers(RuntimeType type)
   at System.Runtime.Serialization.FormatterServices.GetSerializableMembers(Type type, StreamingContext context)
   at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitMemberInfo()
   at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter)
   at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter)
   at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Write(WriteObjectInfo objectInfo, NameInfo memberNameInfo, NameInfo typeNameInfo)
   at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck)
   at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck)
   at Microsoft.XLANGs.Core.ObjectSerializer._serialize(Object graph, StringLookup sl)
   at Microsoft.XLANGs.Core.ObjectSerializer.SerializeStateManager(IStateManager stateMgr, StringLookup lookup)
   at Microsoft.XLANGs.Core.Service.Persist(Boolean dehydrate, Context ctx, Boolean idleRequired, Boolean finalPersist, Boolean bypassCommit, Boolean terminate)
   at Microsoft.XLANGs.Core.ServiceContext.PendingCommit(Boolean ignore, XMessage msg)
   at Microsoft.XLANGs.Core.ExceptionHandlingContext.PendingCommit(Boolean ignoreCommit, XMessage msg)
   at Microsoft.XLANGs.Core.Service.PendingCommit(Boolean ignore, XMessage msg)
   at Microsoft.XLANGs.Core.ServiceContext.PendingCommit(Boolean ignore, XMessage msg)
   at Microsoft.XLANGs.Core.ExceptionHandlingContext.PendingCommit(Boolean ignoreCommit, XMessage msg)
   at Microsoft.XLANGs.Core.Service.PendingCommit(Boolean ignore, XMessage msg)
   at Microsoft.XLANGs.Core.ServiceContext.PendingCommit(Boolean ignore, XMessage msg)
   at Microsoft.XLANGs.Core.ExceptionHandlingContext.PendingCommit(Boolean ignoreCommit, XMessage msg)
   at Microsoft.XLANGs.Core.ExceptionHandlingContext.PendingCommit(Boolean ignoreCommit, XMessage msg)
   at Microsoft.BizTalk.XLANGs.BTXEngine.BTXPortBase.SendMessage(Int32 iOperation, XLANGMessage msg, Correlation[] initCorrelations, Correlation[] followCorrelations, Context cxt, Segment seg, ActivityFlags flags)
   at <the orchestration serializing>.segment2(StopConditions stopOn)
   at Microsoft.XLANGs.Core.SegmentScheduler.RunASegment(Segment s, StopConditions stopCond, Exception& exp)

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Next time, I hope, I'll know what to do...

Until next time ;)

 

Print | posted on Friday, February 15, 2008 8:29 AM

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