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From "Gardella Juan Pablo (Jira)" <>
Subject [jira] [Created] (NIFI-7034) Connection leak with JMSConsumer and JMSPublisher
Date Thu, 16 Jan 2020 14:51:00 GMT
Gardella Juan Pablo created NIFI-7034:

             Summary: Connection leak with JMSConsumer and JMSPublisher
                 Key: NIFI-7034
             Project: Apache NiFi
          Issue Type: Bug
          Components: Extensions
         Environment: Discovered against ActiveMQ.
            Reporter: Gardella Juan Pablo

JMS connections are not closed in case of a failure. Discovered against ActiveMQ, but it applies
to other JMS servers. 

The problem happens when an exception happen and the worker is discarded and never closed
properly. Below the details.

h3. Details
Any exception happening to a ConsumerJMS or PublisherJMS marks the worker as invalid. After
that, the worker is discarded (the worker object reference is never cleaned). Below the snipped
code of the issue:

        } finally {
            //in case of exception during worker's connection (consumer or publisher),
            //an appropriate service is responsible to invalidate the worker.
            //if worker is not valid anymore, don't put it back into a pool, try to rebuild
it first, or discard.
            //this will be helpful in a situation, when JNDI has changed, or JMS server is
not available
            //and reconnection is required.
            if (worker == null || !worker.isValid()){
                getLogger().debug("Worker is invalid. Will try re-create... ");
                final JMSConnectionFactoryProviderDefinition cfProvider = context.getProperty(CF_SERVICE).asControllerService(JMSConnectionFactoryProviderDefinition.class);
                try {
                    // Safe to cast. Method #buildTargetResource(ProcessContext context) sets
only CachingConnectionFactory
                    CachingConnectionFactory currentCF = (CachingConnectionFactory)worker.jmsTemplate.getConnectionFactory();
                    worker = buildTargetResource(context);
                }catch(Exception e) {
                    getLogger().error("Failed to rebuild:  " + cfProvider);
                    worker = null;
Before discard the worker, it should be cleaned all resources associated with it. The proper
solution is to call {{worker.shutdown()}} and then discard it.

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