Re: what is the root cause and how to resolve the error i.e javax.jms.JMSException: No buffer space available (maximum connections reached?

[venkatesh]

Hi Tim,

Please find more details related to this issue and also answers for your
below questions

Your Question: Was there anything unusual in the logs around the time the
errors were seen?  
Answer: Actually No, But there is one scenario during our performance test
where this issue occurs but it's not a valid scenario  

Your Question: Finally, your stack trace from several days ago shows that 
com.spacetimeinsight.alerts.util.MessagingUtils.sendMessage() calls 
org.apache.activemq.ActiveMQConnection.createSession().  

Answer: Please find below code snippet once.
try {
                        ConnectionFactory connectionFactory = 
(ConnectionFactory)
JNDIUtils.getJNDIResouceSource(resourceName);
                        connection = connectionFactory.createConnection();
                        Session session = connection.createSession(false,
Session.CLIENT_ACKNOWLEDGE);
                        connection.start();
                        MessageProducer producer = 
session.createProducer((Destination)
JNDIUtils.getJNDIResouceSource(destinationName));
                        producer.send(buildMessage(msg, msgType, 
session,props));
                } catch (Exception e) {
                        //some code here
                } finally {
                        if (connection != null) {
                                try {
                                        connection.close();
                                } catch (JMSException e) {
                                        // TODO Auto-generated catch block
                                        Logger.error("Exception is sendMessage  
while close connection ",
MessagingUtils.class, e);
                                }
                        }

Question: Do you create a new AMQ session for every message you send?  
Answer: Yes

Question: Is there any caching/pooling being done?
Answer: No


Thanks,
Venkatesh



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