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From "Denis Abramov (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-1145) C# Client CRASHES when trying to do Connection.Start()
Date Thu, 01 Feb 2007 15:52:02 GMT
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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