java.util.ConcurrentModificationException in
org.apache.activemq.broker.region.Queue.iterate()
----------------------------------------------------------------------------------------------
Key: AMQ-3700
URL: https://issues.apache.org/jira/browse/AMQ-3700
Project: ActiveMQ
Issue Type: Bug
Components: Broker
Affects Versions: 5.5.1
Reporter: Timothy Bish
Assignee: Timothy Bish
Priority: Minor
Fix For: 5.6.0
The following stack was reproduced in AMQ 5.5.1 but not the Fuse Message Broker
version.
{noformat}
Exception in thread
"BrokerService[3561F026-E8F62746-2A202922-F17EADF0-7BCA8E67] Task-5053"
java.util.ConcurrentModificationException
jvm 1 | at
java.util.LinkedHashMap$LinkedHashIterator.nextEntry(LinkedHashMap.java:373)
jvm 1 | at
java.util.LinkedHashMap$ValueIterator.next(LinkedHashMap.java:388)
jvm 1 | at
org.apache.activemq.broker.region.Queue.iterate(Queue.java:1376)
jvm 1 | at
org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:127)
jvm 1 | at
org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:48)
jvm 1 | at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
jvm 1 | at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
jvm 1 | at java.lang.Thread.run(Thread.java:662)
{noformat}
This can happened only in the case where the optimizedDispatch mode is enabled
and multiple producers are waiting for space. When the memory usage decreases
and the notifications are run from the iterate() method the method can be
called recursively leading to the error as items are removed from the
messagesWaitingForSpace map.
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