[AMQ-6550] Error occured while processing sync command

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Abandoned
• Affects Version/s: 5.13.2
• Component/s: Transport
• Assignee: Unassigned
• Reporter: Nauman Hameed
• Created: 26/Dec/16 20:09
• Updated: 13/Mar/22 14:16
• Resolved: 13/Mar/22 14:16

Description

I have a two machine setup with an ActiveMQ broker on each. Applications on both machines use the local broker to send status messages to each other. We were doing some testing to see the impact of network disconnect and reconnect on one machine, so we did network unplug and re-plug cycles on one machine (machine A) again and again with some delay (around 5 minutes delay). The brokers reconnected fine and applications were able to exchange status message on all but one such cycle. In the problem cycle machine A was unable to receive messages after network re-connect. On some investigation, we can see following exception in the machine B ActiveMQ logs.

2016-12-22 08:43:14,524 | DEBUG | Error occured while processing sync command: ConsumerInfo {commandId = 4, responseRequired = true, consumerId = CCM-UACSCHP002->CCM-UACSCHP001-64290-1482319725974-53:1:1:2, destination = topic://EEP, prefetchSize = 100, maximumPendingMessageLimit = 0, browser = false, dispatchAsync = true, selector = null, clientId = null, subscriptionName = NC-DS_CCM-UACSCHP002_EEP, noLocal = false, exclusive = false, retroactive = false, priority = 0, brokerPath = [ID:ccm-uacschp001-49159-1482188226837-0:1], optimizedAcknowledge = false, noRangeAcks = false, additionalPredicate = org.apache.activemq.command.NetworkBridgeFilter@e714024}, exception: java.lang.NullPointerException | org.apache.activemq.broker.TransportConnection.Service | triggerStartAsyncNetworkBridgeCreation: remoteBroker=tcp://CCM-UACSCHP001/10.49.224.23:61616@65477, localBroker= vm://CCM-UACSCHP002#172
    java.lang.NullPointerException
    	at org.apache.activemq.broker.TransportConnector.isAllowLinkStealing(TransportConnector.java:582)
    	at org.apache.activemq.broker.ConnectionContext.isAllowLinkStealing(ConnectionContext.java:337)
    	at org.apache.activemq.broker.region.TopicRegion.addConsumer(TopicRegion.java:128)
    	at org.apache.activemq.broker.region.RegionBroker.addConsumer(RegionBroker.java:427)
    	at org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:103)
    	at org.apache.activemq.advisory.AdvisoryBroker.addConsumer(AdvisoryBroker.java:128)
    	at org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:103)
    	at org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:103)
    	at org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:103)
    	at org.apache.activemq.broker.MutableBrokerFilter.addConsumer(MutableBrokerFilter.java:108)
    	at org.apache.activemq.broker.util.LoggingBrokerPlugin.addConsumer(LoggingBrokerPlugin.java:186)
    	at org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:103)
    	at org.apache.activemq.broker.MutableBrokerFilter.addConsumer(MutableBrokerFilter.java:108)
    	at org.apache.activemq.broker.TransportConnection.processAddConsumer(TransportConnection.java:671)
    	at org.apache.activemq.command.ConsumerInfo.visit(ConsumerInfo.java:351)
    	at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:338)
    	at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:188)
    	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.doDispatch(VMTransport.java:162)
    	at org.apache.activemq.transport.vm.VMTransport.dispatch(VMTransport.java:154)
    	at org.apache.activemq.transport.vm.VMTransport.oneway(VMTransport.java:131)
    	at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:68)
    	at org.apache.activemq.transport.ResponseCorrelator.asyncRequest(ResponseCorrelator.java:81)
    	at org.apache.activemq.transport.ResponseCorrelator.request(ResponseCorrelator.java:86)
    	at org.apache.activemq.network.DemandForwardingBridgeSupport.addSubscription(DemandForwardingBridgeSupport.java:920)
    	at org.apache.activemq.network.DurableConduitBridge.setupStaticDestinations(DurableConduitBridge.java:79)
    	at org.apache.activemq.network.DemandForwardingBridgeSupport.doStartLocalAndRemoteBridges(DemandForwardingBridgeSupport.java:436)
    	at org.apache.activemq.network.DemandForwardingBridgeSupport.access$500(DemandForwardingBridgeSupport.java:105)
    	at org.apache.activemq.network.DemandForwardingBridgeSupport$5.run(DemandForwardingBridgeSupport.java:336)
    	at java.lang.Thread.run(Unknown Source)

This exception appears in machine B ActiveMQ logs shortly after the network of machine A is re-connected.