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java.util.ConcurrentModificationException at java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:711) at java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:734) at org.springframework.jms.connection.SingleConnectionFactory$AggregatedExceptionListener.onException(SingleConnectionFactory.java:670) at org.apache.activemq.ActiveMQConnection$5.run(ActiveMQConnection.java:2004) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)