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From "Ivan Pechorin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-3369) occasionally NPE in ActiveMQTextMessage.getSize()
Date Thu, 16 Jun 2011 14:51:47 GMT
occasionally NPE in ActiveMQTextMessage.getSize()
-------------------------------------------------

                 Key: AMQ-3369
                 URL: https://issues.apache.org/jira/browse/AMQ-3369
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.4.1
         Environment: JDK 1.6 (64-bit), Windows Server 2008 x64
            Reporter: Ivan Pechorin


Sometime we get NullPointerException when sending a text message. We use method send(destination,
message) of interface javax.jms.MessageProducer.

java.lang.NullPointerException
 at org.apache.activemq.command.ActiveMQTextMessage.getSize(ActiveMQTextMessage.java:148)
 at org.apache.activemq.ActiveMQSession.send(ActiveMQSession.java:1753)
 at org.apache.activemq.ActiveMQMessageProducer.send(ActiveMQMessageProducer.java:231)
 at org.apache.activemq.ActiveMQMessageProducerSupport.send(ActiveMQMessageProducerSupport.java:300)

Relevant code snippet is:

try {
    final TextMessage message = session.createTextMessage(msg);
    message.setJMSType(type);
    message.setJMSReplyTo(destination);
    message.setJMSCorrelationID(jmsMessageId);
    producer.send(destination, message);
} catch (JMSException ex) {
    ...
}

I.e. we don't reuse or store the message being sent.

We are also 100% sure that both session and its producer are used from one thread only at
any point of time (we have use a custom session pool).

Broker URI is vm://jboss-activemq-broker?jms.copyMessageOnSend=false&jms.objectMessageSerializationDefered=true&jms.useAsyncSend=true

The NPE occurs occasionally, we were not able to reproduce it deterministically so far.

Any suggestions on how to investigate this?

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