Exception while serialization

[Stephan Moeller]

Hi NG,

I serialize the following class over .net remoting:

using System;
using System.Collecti ons;

namespace JobServerLib
{

[Serializable]
public class ParkTree
{

public System.Collecti ons.Queue m_Tree;

public ParkTree()
{
m_Tree = new Queue(1024);
}
}
}

The remoting normaly works fine over 1000 requests, but sometimes
I got this exception from the framework:

Log: 26.01.2005 21:42:53 Msg: System.NullRefe renceException: Der
Objektverweis wurde nicht auf eine Objektinstanz festgelegt.

Server stack trace:
at
System.Data.Dat aTable.System.R untime.Serializ ation.ISerializ able.GetObjectD ata(Serializati onInfo info, StreamingContex t context)
at
System.Runtime. Serialization.F ormatters.Soap. WriteObjectInfo .InitSerialize( Object
obj, ISurrogateSelec tor surrogateSelect or, StreamingContex t context,
SerObjectInfoIn it serObjectInfoIn it, IFormatterConve rter converter,
SoapAttributeIn fo attributeInfo)
at
System.Runtime. Serialization.F ormatters.Soap. WriteObjectInfo .Serialize(Obje ct
obj, ISurrogateSelec tor surrogateSelect or, StreamingContex t context,
SerObjectInfoIn it serObjectInfoIn it, IFormatterConve rter converter,
SoapAttributeIn fo attributeInfo)
at
System.Runtime. Serialization.F ormatters.Soap. ObjectWriter.Wr ite(WriteObject Info objectInfo, NameInfo memberNameInfo, NameInfo typeNameInfo)
at
System.Runtime. Serialization.F ormatters.Soap. ObjectWriter.Se rialize(Object
graph, Header[] inHeaders, SoapWriter serWriter)
at
System.Runtime. Serialization.F ormatters.Soap. SoapFormatter.S erialize(Stream
serializationSt ream, Object graph, Header[] headers)
at
System.Runtime. Remoting.Channe ls.CoreChannel. SerializeSoapMe ssage(IMessage
msg, Stream outputStream, Boolean includeVersions )
at
System.Runtime. Remoting.Channe ls.SoapClientFo rmatterSink.Ser ializeMessage(I MethodCallMessa ge mcm, ITransportHeade rs& headers, Stream& stream)
at
System.Runtime. Remoting.Channe ls.SoapClientFo rmatterSink.Syn cProcessMessage (IMessage msg)

Exception rethrown at [0]:
at System.Runtime. Remoting.Proxie s.RealProxy.Han dleReturnMessag e(IMessage
reqMsg, IMessage retMsg)
at System.Runtime. Remoting.Proxie s.RealProxy.Pri vateInvoke(Mess ageData&
msgData, Int32 type)
at ClientAPI.Clien tAPI.msgToClien t(String msg, Int32 code, Object obj)

I serialize a Queue, but I get erros with a DataTable.
I don´t understand this exception.

Thanx
Stephan