https://issues.apache.org/jira/browse/AMQ-3352 - failover ConnectionStateTracker can lead to OOM with TextMessages. have the cache retain the original message so that it can use the correct formatted size when it is evicted so the addition and substractions match
activemq/trunk/activemq-core/src/main/java/org/apache/activemq/state/ConnectionStateTracker.java