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https://issues.apache.org/activemq/browse/CAMEL-2339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=56803#action_56803
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Claus Ibsen commented on CAMEL-2339:
------------------------------------

There {{DefaultPollingConsumerPollStrategy}} will log at WARN with the ERROR in 
the {{rollback}} method.

{code}
    public boolean rollback(Consumer consumer, Endpoint endpoint, int 
retryCounter, Exception e) throws Exception {
        log.warn("Consumer " + consumer +  " could not poll endpoint: " + 
endpoint.getEndpointUri() + " caused by: " + e.getMessage(), e);
        // we do not want to retry
        return false;
    }
{code}

So you should be able to see this WARN log somewhere

> ScheduledPollConsumer.run swallows Errors
> -----------------------------------------
>
>                 Key: CAMEL-2339
>                 URL: https://issues.apache.org/activemq/browse/CAMEL-2339
>             Project: Apache Camel
>          Issue Type: Bug
>    Affects Versions: 2.0.0
>            Reporter: Jörn Kottmann
>
> We have a camel route which uses the mail component
> and polls from an IMAP mail server.
> Through a deployment mistake the javax.activation.DataSource
> class was not available and resulted in an
> java.lang.NoClassDefFoundError Error which was swallowed
> and not logged.
> This resulted in a silent failure of the mail component. 

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