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From "Gerd Behrmann (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2910) NullPointerException in
Date Mon, 13 Sep 2010 12:09:40 GMT
NullPointerException in 
------------------------

                 Key: AMQ-2910
                 URL: https://issues.apache.org/activemq/browse/AMQ-2910
             Project: ActiveMQ
          Issue Type: Bug
          Components: Message Store
    Affects Versions: 5.4.0
         Environment: java version "1.6.0_20"
Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
Clients connection to the broker use Active MQ 5.3.0 or 5.3.2.
            Reporter: Gerd Behrmann
            Priority: Critical


We got the following NullPointerException in kahadb.

13 Sep 2010 05:53:30 (JMS) [] Caught an Exception adding a message: ActiveMQObjectMessage
{commandId = 111839609, responseRequired = false, messageId = ID:statler.ndgf.org-42286-1282568899957-0:0:2:1:43748846,
originalDestination = null, originalTransactionId = null, producerId = ID:statler.ndgf.org-42286-1282568899957-0:0:2:1,
destination = queue://cells.domain.dCacheDomain, transactionId = null, expiration = 0, timestamp
= 0, arrival = 0, brokerInTime = 1284350009950, brokerOutTime = 0, correlationId = null, replyTo
= null, persistent = false, type = null, priority = 4, groupID = null, groupSequence = 0,
targetConsumerId = null, compressed = false, userID = null, content = org.apache.activemq.util.ByteSequence@1bada5d,
marshalledProperties = null, dataStructure = null, redeliveryCounter = 0, size = 0, properties
= null, readOnlyProperties = false, readOnlyBody = false, droppable = false} first to FilePendingMessageCursor

java.lang.NullPointerException: null
        at org.apache.kahadb.util.LinkedNode.unlink(LinkedNode.java:231) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.util.SequenceSet.removeFirstSequence(SequenceSet.java:203) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.PageFile.allocate(PageFile.java:753) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.Transaction.allocate(Transaction.java:137) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.Transaction.allocate(Transaction.java:121) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList.createEntry(PList.java:425) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList.addLast(PList.java:170) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList$2.execute(PList.java:163) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.Transaction.execute(Transaction.java:728) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList.addLast(PList.java:161) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.tryAddMessageLast(FilePendingMessageCursor.java:221)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.addMessageLast(FilePendingMessageCursor.java:192)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.cursors.StoreQueueCursor.addMessageLast(StoreQueueCursor.java:96)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.Queue.sendMessage(Queue.java:1601) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.Queue.doMessageSend(Queue.java:707) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.Queue.send(Queue.java:646) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.AbstractRegion.send(AbstractRegion.java:365)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.RegionBroker.send(RegionBroker.java:494) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:129) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.scheduler.SchedulerBroker.send(SchedulerBroker.java:136)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:129) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.CompositeDestinationBroker.send(CompositeDestinationBroker.java:96)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransactionBroker.send(TransactionBroker.java:230) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.MutableBrokerFilter.send(MutableBrokerFilter.java:135)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransportConnection.processMessage(TransportConnection.java:460)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.command.ActiveMQMessage.visit(ActiveMQMessage.java:663) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:309)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:185)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:69)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:113)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:217)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:83)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:219) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:201) [activemq-all-5.4.0.jar:5.4.0]
        at java.lang.Thread.run(Thread.java:619) [na:1.6.0_20]
13 Sep 2010 05:53:30 (JMS) [] Async error occurred: java.lang.RuntimeException: java.lang.NullPointerException
java.lang.RuntimeException: java.lang.NullPointerException
        at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.tryAddMessageLast(FilePendingMessageCursor.java:228)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.addMessageLast(FilePendingMessageCursor.java:192)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.cursors.StoreQueueCursor.addMessageLast(StoreQueueCursor.java:96)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.Queue.sendMessage(Queue.java:1601) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.Queue.doMessageSend(Queue.java:707) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.Queue.send(Queue.java:646) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.AbstractRegion.send(AbstractRegion.java:365)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.RegionBroker.send(RegionBroker.java:494) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:129) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.scheduler.SchedulerBroker.send(SchedulerBroker.java:136)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:129) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.CompositeDestinationBroker.send(CompositeDestinationBroker.java:96)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransactionBroker.send(TransactionBroker.java:230) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.MutableBrokerFilter.send(MutableBrokerFilter.java:135)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransportConnection.processMessage(TransportConnection.java:460)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.command.ActiveMQMessage.visit(ActiveMQMessage.java:663) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:309)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:185)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:69)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:113)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:217)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:83)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:219) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:201) [activemq-all-5.4.0.jar:5.4.0]
        at java.lang.Thread.run(Thread.java:619) [na:1.6.0_20]
Caused by: java.lang.NullPointerException: null
        at org.apache.kahadb.util.LinkedNode.unlink(LinkedNode.java:231) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.util.SequenceSet.removeFirstSequence(SequenceSet.java:203) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.PageFile.allocate(PageFile.java:753) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.Transaction.allocate(Transaction.java:137) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.Transaction.allocate(Transaction.java:121) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList.createEntry(PList.java:425) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList.addLast(PList.java:170) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList$2.execute(PList.java:163) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.Transaction.execute(Transaction.java:728) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList.addLast(PList.java:161) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.tryAddMessageLast(FilePendingMessageCursor.java:221)
~[activemq-all-5.4.0.jar:5.4.0]
        ... 24 common frames omitted

Looking at the code, it appears to me that the only way an NPE can be thrown at that place
is if list is null. Since the same method however tests for that exact case, I suspect there
is unsynchronized concurrent access to the LinkedNode.

A few hours later we got more failures:

13 Sep 2010 08:38:19 (JMS) [] Caught an Exception adding a message: ActiveMQObjectMessage
{commandId = 29114496, responseRequired = false, messageId = ID:arctic01.csc.fi-39780-1280232016428-0:0:2:1:333447,
originalDestination = null, originalTransactionId = null, producerId = ID:arctic01.csc.fi-39780-1280232016428-0:0:2:1,
destination = queue://cells.domain.dCacheDomain, transactionId = null, expiration = 0, timestamp
= 0, arrival = 0, brokerInTime = 1284359899636, brokerOutTime = 0, correlationId = null, replyTo
= null, persistent = false, type = null, priority = 4, groupID = null, groupSequence = 0,
targetConsumerId = null, compressed = false, userID = null, content = org.apache.activemq.util.ByteSequence@6f28b428,
marshalledProperties = null, dataStructure = null, redeliveryCounter = 0, size = 0, properties
= null, readOnlyProperties = false, readOnlyBody = false, droppable = false} first to FilePendingMessageCursor

java.lang.NullPointerException: null
        at org.apache.kahadb.util.LinkedNode.isHeadNode(LinkedNode.java:64) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.util.LinkedNode.unlink(LinkedNode.java:230) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.util.SequenceSet.removeFirstSequence(SequenceSet.java:203) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.PageFile.allocate(PageFile.java:753) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.Transaction.allocate(Transaction.java:137) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.Transaction.allocate(Transaction.java:121) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList.createEntry(PList.java:425) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList.addLast(PList.java:170) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList$2.execute(PList.java:163) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.Transaction.execute(Transaction.java:728) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList.addLast(PList.java:161) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.tryAddMessageLast(FilePendingMessageCursor.java:221)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.addMessageLast(FilePendingMessageCursor.java:192)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.cursors.StoreQueueCursor.addMessageLast(StoreQueueCursor.java:96)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.Queue.sendMessage(Queue.java:1601) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.Queue.doMessageSend(Queue.java:707) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.Queue.send(Queue.java:646) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.AbstractRegion.send(AbstractRegion.java:365)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.RegionBroker.send(RegionBroker.java:494) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:129) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.scheduler.SchedulerBroker.send(SchedulerBroker.java:136)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:129) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.CompositeDestinationBroker.send(CompositeDestinationBroker.java:96)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransactionBroker.send(TransactionBroker.java:230) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.MutableBrokerFilter.send(MutableBrokerFilter.java:135)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransportConnection.processMessage(TransportConnection.java:460)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.command.ActiveMQMessage.visit(ActiveMQMessage.java:663) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:309)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:185)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:69)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:113)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:217)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:83)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:219) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:201) [activemq-all-5.4.0.jar:5.4.0]
        at java.lang.Thread.run(Thread.java:619) [na:1.6.0_20]
13 Sep 2010 08:38:19 (JMS) [] Async error occurred: java.lang.RuntimeException: java.lang.NullPointerException
java.lang.RuntimeException: java.lang.NullPointerException
        at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.tryAddMessageLast(FilePendingMessageCursor.java:228)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.addMessageLast(FilePendingMessageCursor.java:192)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.cursors.StoreQueueCursor.addMessageLast(StoreQueueCursor.java:96)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.Queue.sendMessage(Queue.java:1601) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.Queue.doMessageSend(Queue.java:707) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.Queue.send(Queue.java:646) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.AbstractRegion.send(AbstractRegion.java:365)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.RegionBroker.send(RegionBroker.java:494) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:129) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.scheduler.SchedulerBroker.send(SchedulerBroker.java:136)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:129) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.CompositeDestinationBroker.send(CompositeDestinationBroker.java:96)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransactionBroker.send(TransactionBroker.java:230) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.MutableBrokerFilter.send(MutableBrokerFilter.java:135)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransportConnection.processMessage(TransportConnection.java:460)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.command.ActiveMQMessage.visit(ActiveMQMessage.java:663) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:309)
~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:185)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:69)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:113)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:217)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:83)
[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:219) [activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:201) [activemq-all-5.4.0.jar:5.4.0]
        at java.lang.Thread.run(Thread.java:619) [na:1.6.0_20]
Caused by: java.lang.NullPointerException: null
        at org.apache.kahadb.util.LinkedNode.isHeadNode(LinkedNode.java:64) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.util.LinkedNode.unlink(LinkedNode.java:230) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.util.SequenceSet.removeFirstSequence(SequenceSet.java:203) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.PageFile.allocate(PageFile.java:753) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.Transaction.allocate(Transaction.java:137) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.Transaction.allocate(Transaction.java:121) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList.createEntry(PList.java:425) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList.addLast(PList.java:170) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList$2.execute(PList.java:163) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.kahadb.page.Transaction.execute(Transaction.java:728) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.store.kahadb.plist.PList.addLast(PList.java:161) ~[activemq-all-5.4.0.jar:5.4.0]
        at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.tryAddMessageLast(FilePendingMessageCursor.java:221)
~[activemq-all-5.4.0.jar:5.4.0]
        ... 24 common frames omitted

We got a number of those exceptions with the same stack trace and then followed by tons of
other NullPointerExceptions, likely because the list was corrupted at that point.


Not long after these stack traces message delivery began to hang. A restart of the broker
only helped temporarily as message delivery would hang again after half a minute or so. To
our big suprise moving the db directory to let ActiveMQ create a new database didn't solve
the problem either. I am unable to tell to what extend that was caused by the above exceptions
or not.

We are happy to provide any other information you may need to debug this problem.

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