ActiveMQ消息组-ConcurrentModificationException

我将AMQ消息组与AMQ5.6一起使用，并将其与Kahadb持久消息一起使用，并定期在日志中看到此警告。我没有看到任何具体的错误，但我想知道这有什么副作用，等等

我的消费者是一个Camel（2.9.2）路由，maxConcurrentConsumers=5（使用AMQ连接池等）。我将尝试在某个时候将其归结为一个单元测试……现在，这里是堆栈跟踪

Async error occurred: java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException
java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException
    at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
    at java.util.concurrent.FutureTask.get(FutureTask.java:83)
    at org.apache.activemq.broker.region.Queue.doMessageSend(Queue.java:785)
    at org.apache.activemq.broker.region.Queue.send(Queue.java:707)
    at org.apache.activemq.broker.region.AbstractRegion.send(AbstractRegion.java:407)
    at org.apache.activemq.broker.region.RegionBroker.send(RegionBroker.java:503)
    at org.apache.activemq.broker.jmx.ManagedRegionBroker.send(ManagedRegionBroker.java:305)
    at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:129)
    at org.apache.activemq.broker.CompositeDestinationBroker.send(CompositeDestinationBroker.java:96)
    at org.apache.activemq.broker.TransactionBroker.send(TransactionBroker.java:306)
    at org.apache.activemq.broker.MutableBrokerFilter.send(MutableBrokerFilter.java:135)
    at org.apache.activemq.broker.TransportConnection.processMessage(TransportConnection.java:453)
    at org.apache.activemq.command.ActiveMQMessage.visit(ActiveMQMessage.java:681)
    at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:292)
    at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:150)
    at org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:116)
    at org.apache.activemq.transport.MutexTransport.onCommand(MutexTransport.java:50)
    at org.apache.activemq.transport.vm.VMTransport.iterate(VMTransport.java:231)
    at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:122)
    at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:43)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:680)
Caused by: java.util.ConcurrentModificationException
    at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
    at java.util.HashMap$KeyIterator.next(HashMap.java:828)
    at org.apache.activemq.util.MarshallingSupport.marshalPrimitiveMap(MarshallingSupport.java:64)
    at org.apache.activemq.command.Message.beforeMarshall(Message.java:210)
    at org.apache.activemq.command.ActiveMQObjectMessage.beforeMarshall(ActiveMQObjectMessage.java:199)
    at org.apache.activemq.openwire.v6.MessageMarshaller.looseMarshal(MessageMarshaller.java:277)
    at org.apache.activemq.openwire.v6.ActiveMQMessageMarshaller.looseMarshal(ActiveMQMessageMarshaller.java:111)
    at org.apache.activemq.openwire.v6.ActiveMQObjectMessageMarshaller.looseMarshal(ActiveMQObjectMessageMarshaller.java:111)
    at org.apache.activemq.openwire.OpenWireFormat.marshal(OpenWireFormat.java:168)
    at org.apache.activemq.store.kahadb.KahaDBStore$KahaDBMessageStore.addMessage(KahaDBStore.java:429)
    at org.apache.activemq.store.kahadb.KahaDBStore$StoreQueueTask.run(KahaDBStore.java:1177)

---

为此（）记录了JIRA，这听起来像是KahaDB和消息组组合的问题。设置concurrentStoreAndDispatchQueues=false解决了这个问题（感谢Gary Tully的建议）

第一个建议是始终尝试最新版本，因为自那以后发生了修复。感谢Tim，计划升级到5.6，但我尝试在此之前添加一些功能。我想我会检查一下这方面是否有特别修复的问题……没有看到任何与我的问题相匹配的AMQ JIRAs，等等……自5.5.0以来，有太多已解决的问题，所以很难说清楚。创建一个可以复制它的单元测试将有助于对更新的代理版本进行简单的验证，并在问题仍然存在的情况下为您提供Jira中提交的内容。Tim，很公平……我也将在5.6中尝试一下……Thxu幸运的是，我在5.6中也遇到了同样的问题。。。