I found out the problem which was making my test not reach the onComplete syncProcessor but I am having another issue now. Inside the processor I use producer.sendBody(buildDurableSubscription(register), holder);, where producer is created in the context.xml with <camel:template id="producer" /> and return consumer.receiveBodyNoWait(buildDurableSubscription(register), SettlementHolder.class);, where the consumer is created with <camel:consumerTemplate id="consumer"/>
to put an exchange on a persistent queue, so that in case of power failure or any other reason I can have the exchange after a restart, and then to receive it back and process it after onCompletion. The problem is that sometimes the first time when the "consumer.receiveBodyNoWait" is invoked it returns null, but if I invoke it twice the second invocation will return the pending exchange. This is the logging: first invocation returns null: 12:56:54.628 [Camel (camelContextTransactionToDBPublisher) thread #2 - OnCompletion] DEBUG org.apache.camel.impl.ConsumerCache - <<<< Endpoint[activemq://queue:masterDataExport.transactionToDBPublisher.synchronizedSettlement.register1] 12:56:54.631 [Camel (camelContextTransactionToDBPublisher) thread #2 - OnCompletion] DEBUG o.a.activemq.ActiveMQMessageConsumer - remove: ID:pc-clucutar-63598-1384772199184-2:1:1:3, *lastDeliveredSequenceId:0* second invocation returns the object: 12:57:05.134 [Camel (camelContextTransactionToDBPublisher) thread #2 - OnCompletion] DEBUG org.apache.camel.impl.ConsumerCache - <<<< Endpoint[activemq://queue:masterDataExport.transactionToDBPublisher.synchronizedSettlement.register1] 12:57:05.138 [Camel (camelContextTransactionToDBPublisher) thread #2 - OnCompletion] DEBUG o.a.activemq.ActiveMQMessageConsumer - remove: ID:pc-clucutar-63598-1384772199184-2:1:1:4, *lastDeliveredSequenceId:55* Even though I can see that the queueSize = 1 in JConsole, the retrieve operation doesn't retrieve anything and the queueSize doesn't change. The second call retrieves the exchange and queueSize becomes 0. Any idea? -- View this message in context: http://camel.465427.n5.nabble.com/onCompletion-not-triggerd-in-testing-tp5743163p5743434.html Sent from the Camel - Users mailing list archive at Nabble.com.