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Date: Tue, 1 Jul 2008 14:24:00 -0700 (PDT)
From: "Hans Bausewein (JIRA)" <jira@apache.org>
To: dev@activemq.apache.org
Subject: [jira] Issue Comment Edited: (AMQ-1719) Resource adapter stops
 consuming messages after broker is forcefully stopped/restarted during XA
 transaction.
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    [ https://issues.apache.org/activemq/browse/AMQ-1719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43848#action_43848 ] 

hansb edited comment on AMQ-1719 at 7/1/08 2:23 PM:
-------------------------------------------------------------

The NullPointerException occurs at the last line of the 'run()' method of RemoveTransactionAction:

{code:title=ConnectionStateTracker.java|borderStyle=solid}

    private class RemoveTransactionAction implements Runnable {
        private final TransactionInfo info;   

        public RemoveTransactionAction(TransactionInfo info) {
            this.info = info;
        }

        public void run() {
            ConnectionId connectionId = info.getConnectionId();
            ConnectionState cs = connectionStates.get(connectionId);
            cs.removeTransactionState(info.getTransactionId());
        }
    }
{code}

Apparently there is no ConnectionState for "connectionId" (anymore).

"removeTransactionState" removes the TransactionState identified by "transactionId" from a local Map, but since ConnectionState does not exist anymore, this is bogus.

The NullPointerException itself is not a problem, but can be avoided by putting an "if (cs != null) {} the last statement.

The problem probably existed already.


      was (Author: hansb):
    The NullPointerException occurs at the last line of the 'run()' method of RemoveTransactionAction:


    private class RemoveTransactionAction implements Runnable {
        private final TransactionInfo info;   

        public RemoveTransactionAction(TransactionInfo info) {
            this.info = info;
        }

        public void run() {
            ConnectionId connectionId = info.getConnectionId();
            ConnectionState cs = connectionStates.get(connectionId);
            cs.removeTransactionState(info.getTransactionId());
        }
    }

Apparently there is no ConnectionState for "connectionId" (anymore).

"removeTransactionState" removes the TransactionState identified by "transactionId" from a local Map, but since ConnectionState does not exist anymore, this is bogus.

The NullPointerException itself is not a problem, but can be avoided by putting an "if (cs != null) {} the last statement.

The problem probably existed already.


> Resource adapter stops consuming messages after broker is forcefully stopped/restarted during XA transaction.
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-1719
>                 URL: https://issues.apache.org/activemq/browse/AMQ-1719
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker, Connector
>    Affects Versions: 5.1.0
>         Environment: Windows XP, IBM WebSphere 6.1.0.15, Oracle 10.2.0.3, Java 1.5.0 ( IBM J9 VM), ActiveMQ 5.1.0 downloaded 2008-May-12.
>            Reporter: Johan Ekesparr
>         Attachments: apache-activemq-5.1.0_data.tar.zip, DemoEAR.ear, websphere_trace.log
>
>
> Have attached logs from websphere, activeMQ and also the content of the datadirectory for details of data state ( plus the smal program used to create the scenario).
> #1. Installed the resource adapter that came with ActiveMQ into the websperhe applicationserver and configured it to connect to external broker using failover.
> #2. Setup a JDBC XA datasource ( Oracle ) and JMS XA destination ( ActiveMQ ).
> #3. Created a small Message Driven bean that receives a JMS message that it tries to store in the database after which it sleeps for 5 secs. And deployed it to the WebSphere appserver.
> #4. Started the activemq broker without doing any modifications since the download and extract into the filesystem.
> #5. Started applicationserver. 
> #6. Started publishing messages to the broker
> #7. As expected the Message driven bean received the messages one-by-one and processed them.
> #8. Used to ctrl-C on the broker to halt it in the middle of the processing. Resulting in a failed commit of XA transaction.
> #9. Waited a while and then started broker again.
> #10. Received Exception on client side and nothing more happened. 
> Exception in thread "ActiveMQ Transport: tcp://localhost/127.0.0.1:61616" java.lang.NullPointerException
>     at org.apache.activemq.state.ConnectionStateTracker$RemoveTransactionAction.run(ConnectionStateTracker.java:84)
>     at org.apache.activemq.state.Tracked.onResponses(Tracked.java:31)
>     at org.apache.activemq.transport.failover.FailoverTransport$3.onCommand(FailoverTransport.java:148)
>     at org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:143)
>     at org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:206)
>     at org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:84)
>     at org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:196)
>     at org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:183)
>     at java.lang.Thread.run(Thread.java:801)

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