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.byteseque...@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.byteseque...@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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