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From "Denis Abramov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQ-1145) C# Client CRASHES when trying to do Connection.Start()
Date Mon, 05 Feb 2007 14:06:04 GMT

    [ https://issues.apache.org/activemq/browse/AMQ-1145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_38471
] 

Denis Abramov commented on AMQ-1145:
------------------------------------

This seems to exhibit the problem in the same line of code as AMQ-1131. Seems like the same
issue but through a different method.

> C# Client CRASHES when trying to do Connection.Start()
> ------------------------------------------------------
>
>                 Key: AMQ-1145
>                 URL: https://issues.apache.org/activemq/browse/AMQ-1145
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: NMS (C# client)
>    Affects Versions: 4.1.0
>         Environment: NMS C# revision 501459
> ACTIVEMQ v. 4.1.0
>            Reporter: Denis Abramov
>            Priority: Blocker
>
> A few days ago I checked out the latest C#/.NET code using svn as per the instructions
on the website. Revision: "Checked out revision 501459". I built the code without any problems
but am now trying to run it in VS2005. From the debugger it looks like the error occurs when
I call _connection.Start()  Here is my code: 
> private IConnection _connection; 
> private string JMS_URL = "tcp://localhost:61616"; 
> public MessageManager() { 
>         IConnectionFactory connectionFactory = new ConnectionFactory(new Uri(JMS_URL));

>         _connection = connectionFactory.CreateConnection(); 
>         _connection.ExceptionListener += new ExceptionListener(_connection_ExceptionListener);

>         _connection.Start(); 
> } 
>  void _connection_ExceptionListener(Exception exception) 
>     { 
>         Console.WriteLine("Received Exception from JMS: " + exception); 
>     } 
>         
> In the console window I get: 
> Received Exception from JMS: System.NullReferenceException: Object reference not 
>  set to an instance of an object. 
>    at ActiveMQ.Transport.WireFormatNegotiator.OnCommand(ITransport sender, Comma 
> nd command) 
>    at ActiveMQ.Transport.Tcp.TcpTransport.ReadLoop() 
> Received Exception from JMS: System.NullReferenceException: Object reference not 
>  set to an instance of an object. 
>    at ActiveMQ.Transport.WireFormatNegotiator.OnCommand(ITransport sender, Comma 
> nd command) 
>    at ActiveMQ.Transport.Tcp.TcpTransport.ReadLoop() 
> Received Exception from JMS: System.NullReferenceException: Object reference not 
>  set to an instance of an object. 
>    at ActiveMQ.Transport.WireFormatNegotiator.OnCommand(ITransport sender, Comma 
> nd command) 
>    at ActiveMQ.Transport.Tcp.TcpTransport.ReadLoop() 
> Received Exception from JMS: System.NullReferenceException: Object reference not 
>  set to an instance of an object. 
>    at ActiveMQ.Transport.WireFormatNegotiator.OnCommand(ITransport sender, Comma 
> nd command) 
>    at ActiveMQ.Transport.Tcp.TcpTransport.ReadLoop() 
> More concrete error after debugging using ActiveMQ source code:
> -------------------------------------------------------------------------------------------
> in ActiveMQ.Transport.WireFormatNegotiator the "command" argument is sometimes "Null"
-- not sure why it happens or how to fix it (protecting it doesn't help but hangs the whole
system)
>    protected override void OnCommand(ITransport sender, Command command) 
>         { 
>             if ( command.GetDataStructureType() == WireFormatInfo.ID_WireFormatInfo )

>             ... 
>         } 
> Complete error message: 
> System.NullReferenceException: Object reference not set to an instance of an object.

>    at ActiveMQ.Transport.WireFormatNegotiator.OnCommand(ITransport sender, Command command)
in D:\activemq-dotnet\activemq-dotnet\src\main\csharp\ActiveMQ\Transport\WireFormatNegotiator.cs:line
75 
>    at ActiveMQ.Transport.Tcp.TcpTransport.ReadLoop() in D:\activemq-dotnet\activemq-dotnet\src\main\csharp\ActiveMQ\Transport\Tcp\TcpTransport.cs:line
146 

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