Clear queue exception

[Adrian Tarau]

I got this exception when I tried to clear a queue(I'm in the same 
process so I have access to the queue directly).

java.util.ConcurrentModificationException
   at 
java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:617)
   at java.util.LinkedList$ListItr.remove(LinkedList.java:585)
   at org.apache.activemq.broker.region.Queue.purge(Queue.java:578)