[
https://issues.apache.org/activemq/browse/AMQ-2910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Gary Tully updated AMQ-2910:
----------------------------
Attachment: AMQ2910Test.java
Attaching a test case that can reproduce this exception.
> NullPointerException in kahadb linked list
> ------------------------------------------
>
> 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
> Attachments: AMQ2910Test.java
>
>
> 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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