I suppose I should also mention that we're using slf4j 1.6.1. Not sure if that has anything to do with this, since the stack trace does show it happening in slf4j land...
org.slf4j slf4j-api 1.6.1 runtime org.slf4j slf4j-jdk14 1.6.1 runtime ----- Dan Checkoway dcheckoway gmail com -- View this message in context: http://activemq.2283324.n4.nabble.com/ConcurrentModificationException-in-embedded-5-5-0-broker-tp3435952p3435958.html Sent from the ActiveMQ - User mailing list archive at Nabble.com.