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https://issues.apache.org/activemq/browse/AMQCPP-142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_40287
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Nathan Mittler commented on AMQCPP-142:
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Roger,
I'm having some trouble understanding the example. From what you've provided,
it looks like you close all the resources after sending each message and then
try to use those resources again, which certainly wouldn't work :).
Would you mind submitting a full source example that compiles?
Thanks!
Nate
> 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: Openwire
> Affects Versions: 2.1
> Environment: WinXP Pro SP2
> Reporter: Roger
> Assignee: Nathan Mittler
> Fix For: 2.1.1
>
>
> 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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