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Posted to dev@activemq.apache.org by "Denis Abramov (JIRA)" <ji...@apache.org> on 2007/02/01 16:52:02 UTC
[jira] Created: (AMQ-1145) C# Client CRASHES when trying to do
Connection.Start()
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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