[jboss-jira] [JBoss JIRA] Commented: (JGRP-594) Intermittently, a Null pointer exception is thrown when trying to remove non-existent entry in ReplicatedHashMap

Mon Oct 20 03:16:21 EDT 2008

    [ https://jira.jboss.org/jira/browse/JGRP-594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12434343#action_12434343 ] 

Bela Ban commented on JGRP-594:
-------------------------------

This should be fixed in 2.7 (CVS head) and 2.6. As a workaround, use FLUSH. Please try with the latest version of 2.7 or 2.6 (2.6.5) and let us know if the issue still persists. In the meantime I'm going to close this issue, but feel free to re-open if the issue pops up again. In that case, I'd like to have precise instructions how to reproduce the issue (I can't start 60 instances)...

> Intermittently, a Null pointer exception is thrown when trying to remove non-existent entry in ReplicatedHashMap
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: JGRP-594
>                 URL: https://jira.jboss.org/jira/browse/JGRP-594
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 2.5
>         Environment: Linux
>            Reporter: Dipak Kothari
>            Assignee: Bela Ban
>             Fix For: 2.7
>
>         Attachments: Server2.log
>
>
> Intermittently, when an entry is removed from a ReplicatedHashMap (where the entry does not exist) the following exception is thrown:
> java.lang.RuntimeException: remove(APMExample.Services.examples.ServerA09) failed
>         at org.jgroups.blocks.ReplicatedHashMap.remove(ReplicatedHashMap.java:405)
>         at com.ubs.apm.control.service.nameservice.jgroup.JGroupNameService.unRegisterService(JGroupNameService.java:132)
>         at com.ubs.apm.control.sensors.ControlSensorManager.cleanup(ControlSensorManager.java:468)
>         at com.ubs.apm.control.sensors.ControlSensorManager.<init>(ControlSensorManager.java:125)
>         at com.ubs.apm.control.sensors.ControlSensorManager.<init>(ControlSensorManager.java:106)
>         at com.ubs.apm.control.example.ManagedServer.init(ManagedServer.java:20)
>         at com.ubs.apm.control.example.ManagedServer.main(ManagedServer.java:45)
> Caused by: java.lang.RuntimeException: failed executing request [req_id=1189617222436
> caller=14.64.61.201:6825
> 14.64.61.201:6838: sender=14.64.61.201:6838, retval=null, received=false, suspected=false
> .... many such lines ...
> 14.64.61.201:6860: sender=14.64.61.201:6860, retval=null, received=false, suspected=false
> 14.64.61.201:6847: sender=14.64.61.201:6847, retval=null, received=false, suspected=false
> request_msg: [dst: <null>, src: 14.64.61.201:6825 (2 headers), size=143 bytes]
> rsp_mode: GET_NONE
> done: true
> timeout: 5000
> expected_mbrs: 0 ([14.64.61.201:6815, 14.64.61.201:6816, 14.64.61.201:6824, 14.64.61.201:6825, 14.64.61.201:6826, 14.64.61.201:6827, 14.64.61.201:6828, 14.64.61.201:6829, 14.64.61.201:6830, 14.64.61.201:6831, 14.64.61.201:6833, 14.64.61.201:6834, 14.64.61.201:6835, 14.64.61.201:6836, 14.64.61.201:6837, 14.64.61.201:6838, 14.64.61.201:6839, 14.64.61.201:6842, 14.64.61.201:6843, 14.64.61.201:6844, 14.64.61.201:6845, 14.64.61.201:6846, 14.64.61.201:6847, 14.64.61.201:6848, 14.64.61.201:6849, 14.64.61.201:6850, 14.64.61.201:6851, 14.64.61.201:6852, 14.64.61.201:6853, 14.64.61.201:6854, 14.64.61.201:6855, 14.64.61.201:6856, 14.64.61.201:6857, 14.64.61.201:6858, 14.64.61.201:6859, 14.64.61.201:6860, 14.64.61.201:6861, 14.64.61.201:6862, 14.64.61.201:6863, 14.64.61.201:6864, 14.64.61.201:6865, 14.64.61.201:6866])]
>         at org.jgroups.blocks.MessageDispatcher.castMessage(MessageDispatcher.java:433)
>         at org.jgroups.blocks.RpcDispatcher.callRemoteMethods(RpcDispatcher.java:199)
>         at org.jgroups.blocks.RpcDispatcher.callRemoteMethods(RpcDispatcher.java:167)
>         at org.jgroups.blocks.RpcDispatcher.callRemoteMethods(RpcDispatcher.java:163)
>         at org.jgroups.blocks.ReplicatedHashMap.remove(ReplicatedHashMap.java:402)
>         ... 6 more
> Caused by: java.lang.RuntimeException: failure adding msg [dst: <null>, src: 14.64.61.201:6825 (2 headers), size=143 bytes] to the retransmit table for 14.64.61.201:6825
>         at org.jgroups.protocols.pbcast.NAKACK.send(NAKACK.java:636)
>         at org.jgroups.protocols.pbcast.NAKACK.down(NAKACK.java:438)
>         at org.jgroups.protocols.pbcast.STABLE.down(STABLE.java:317)
>         at org.jgroups.protocols.pbcast.GMS.down(GMS.java:782)
>         at org.jgroups.protocols.pbcast.STATE_TRANSFER.down(STATE_TRANSFER.java:221)
>         at org.jgroups.stack.ProtocolStack.down(ProtocolStack.java:339)
>         at org.jgroups.JChannel.downcall(JChannel.java:1240)
>         at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.down(MessageDispatcher.java:752)
>         at org.jgroups.blocks.RequestCorrelator.sendRequest(RequestCorrelator.java:301)
>         at org.jgroups.blocks.GroupRequest.doExecute(GroupRequest.java:440)
>         at org.jgroups.blocks.GroupRequest.execute(GroupRequest.java:190)
>         at org.jgroups.blocks.MessageDispatcher.castMessage(MessageDispatcher.java:430)
>         ... 10 more
> Caused by: java.lang.NullPointerException
>         at org.jgroups.protocols.pbcast.NAKACK.send(NAKACK.java:632)
>         ... 21 more

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