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From "Rajith Attapattu (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (QPID-3234) Exception handling logic is incorrect in AMQConnection.java
Date Fri, 29 Apr 2011 13:44:05 GMT

     [ https://issues.apache.org/jira/browse/QPID-3234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rajith Attapattu closed QPID-3234.
----------------------------------

    Resolution: Not A Problem

After speaking with Robert Godfrey I agree that in some cases the Exception Listener is the
only mechanism for a JMS client to know an issue with a session.
For example if there is a connection with a single session where a Consumer is using a Message
Listener, then the only way the consumer would know if the session was closed if it is notified
via the Exception Listener. In this case the session closure is infact a serious problem with
the connection.

> Exception handling logic is incorrect in AMQConnection.java
> -----------------------------------------------------------
>
>                 Key: QPID-3234
>                 URL: https://issues.apache.org/jira/browse/QPID-3234
>             Project: Qpid
>          Issue Type: Bug
>            Reporter: Rajith Attapattu
>
> IMO there are two issues here.
> 1. The exception listener gets notified of session level exceptions.
> 2. A session level exception causes the connection to be closed along with the other
sessions.
> 1. We shouldn't notify the connection's exception listener when there is a session level
error. The JMS API doc clearly states,
> "If a JMS provider detects a serious problem with a Connection object, it informs the
Connection object's ExceptionListener, if one has been registered. It does this by calling
the listener's onException method, passing it a JMSException argument describing the problem.
"
> So certainly execution exceptions which only invalidates the session should not be notified
via the exception listener.
> 2. Going further if one looks at the AMQConnection.java exceptionReceived() method,
> It seems that an execution exception can in fact close the underlying connection (and
the rest of the sessions) due to the following piece of logic.
> if (hardError(cause))
> {
> closer = (!_closed.getAndSet(true)) || closer;
> { _logger.info("Closing AMQConnection due to :" + cause); }
> }
> Digging further for any AMQException hardError method will return true.
> Therefore we need to rework that piece of code.

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