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From "Roger (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQCPP-142) BufferedOutputStream flush called after BufferedOutputStream close resulting in unhandled exceptions
Date Thu, 06 Sep 2007 09:12:22 GMT
BufferedOutputStream flush called after BufferedOutputStream close resulting in unhandled exceptions
----------------------------------------------------------------------------------------------------

                 Key: AMQCPP-142
                 URL: https://issues.apache.org/activemq/browse/AMQCPP-142
             Project: ActiveMQ C++ Client
          Issue Type: Bug
          Components: CMS Impl
    Affects Versions: 2.1
         Environment: WinXP Pro SP2
            Reporter: Roger
            Assignee: Nathan Mittler


After comms have been broken (shutting down the broker is an easy way to reproduce...) and
the producer attempts to send a message a Transport IO exception is raised but after this
point the session cannot be cleanly closed. The sessions closed flag indicates it is not already
closed. The problem seems to be mainly in the BufferedOutputStream - this objects "close"
method is called but after this the same objects "flush" method is called resulting in exceptions
(attempts to access deleted memory). I'm presuming it is attempting to send cached data after
the stream has been closed.

This is ActiveMQ-CPP 2.1, using Broker version 5.0:-
http://people.apache.org/repo/m2-snapshot-repository/org/apache/activemq/apache-activemq/5.0-SNAPSHOT/apache-activemq-5.0-20070904.133257-1.zip

The following is an example snippet of code which demonstrates this problem:

static Connection* connection = NULL;
static Session* session = NULL;
static Destination* destination = NULL;
static MessageProducer* producer = NULL;

static const std::string brokerURI = "tcp://127.0.0.1:61616?wireFormat=openwire&transport.useAsyncSend=true&connectionTimeout=5000&soTimeout=1000";

bool initialise()
{
        bool result = false;

        try {
                ActiveMQConnectionFactory* connectionFactory = new ActiveMQConnectionFactory(
brokerURI );

                // Create a Connection
                connection = connectionFactory->createConnection();
                connection->start();

                delete connectionFactory;

                // Create a Session
                session = connection->createSession( Session::AUTO_ACKNOWLEDGE );

                // Create the destination
                destination = session->createQueue( "BARNEY" );

                // Create a MessageProducer from the Session to the Queue
                producer = session->createProducer( destination );
                producer->setDeliveryMode( DeliveryMode::NON_PERSISTENT);

                result = true;
        }
        catch (activemq::exceptions::ActiveMQException& e) {
                e.printStackTrace();
        }

        return result;
}


bool sendMessage(string msg)
{
        bool result = false;

    try {
            TextMessage* message = session->createTextMessage( msg );

             producer->send( message );
             delete message;
               
             result = true;
        }
        catch (activemq::exceptions::ActiveMQException& e) { // <------<<<<
catches the exception after the broker has been shutdown (transport is closed)
                // Close open resources.
                try{
                        if( session != NULL ){
                                session->close();  // <--------<<<< Causes
unhandled exceptions
                        }
            // close connection...
                        // free everything else...
                }
        }

        return result;
}

void main()
{
        if (initialise()){
                while (1){
                        // do things to create the data to send...

                        // send data
                        sendMessage("fred");

                         // sleep for a bit....

                         // <<<< KILL THE BROKER SOMETIME DURING THIS LOOP >>>>
                }

                // clean up .....
        }
} 

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