[JIRA] (COMETD-596) AcknowledgedMessagesSessionExtension - java.lang.ArrayIndexOutOfBoundsException in BatchArrayQueue.clearToBatch

[john_rambo (JIRA)]

john_rambo created an issue

CometD / COMETD-596 AcknowledgedMessagesSessionExtension - java.lang.ArrayIndexOutOfBoundsException in BatchArrayQueue.clearToBatch Issue Type: Bug Affects Versions: 3.0.4 Assignee: Unassigned Attachments: cometd_ackModuleerror.png Components: java-server Created: 01/Jul/15 4:23 AM Labels: cometd long-polling AcknowledgedMessagesSessionExtension Priority: Major Reporter: john_rambo When we have multiple notifications (about 300) send form server to client (2 different browsers) - then we spot that after sending some of them we see the ArrayIndexOutOfBounds exceptions in Java code: 11:46:10,061 INFO [org.cometd.bayeux.server.ServerSession] (http-/0.0.0.0:8090-13) Exception while invoking listener org.cometd.server.ext.AcknowledgedMessagesSessionExtension@7d12b538: java.lang.ArrayIndexOutOfBoundsException: 16 at org.cometd.server.ext.BatchArrayQueue.exportMessagesToBatch(BatchArrayQueue.java:159) [cometd-java-server-3.0.4.jar:] at org.cometd.server.ext.AcknowledgedMessagesSessionExtension.deQueue(AcknowledgedMessagesSessionExtension.java:127) [cometd-java-server-3.0.4.jar:] at org.cometd.server.ServerSessionImpl.notifyDeQueue(ServerSessionImpl.java:487) [cometd-java-server-3.0.4.jar:] at org.cometd.server.ServerSessionImpl.takeQueue(ServerSessionImpl.java:468) [cometd-java-server-3.0.4.jar:] at org.cometd.server.transport.AbstractHttpTransport.flush(AbstractHttpTransport.java:331) [cometd-java-server-3.0.4.jar:] at org.cometd.server.transport.AbstractHttpTransport.resume(AbstractHttpTransport.java:346) [cometd-java-server-3.0.4.jar:] at org.cometd.server.transport.AbstractStreamHttpTransport.process(AbstractStreamHttpTransport.java:82) [cometd-java-server-3.0.4.jar:] at org.cometd.server.transport.AbstractStreamHttpTransport.handle(AbstractStreamHttpTransport.java:52) [cometd-java-server-3.0.4.jar:] at org.cometd.server.CometDServlet.service(CometDServlet.java:102) [cometd-java-server-3.0.4.jar:] Please also see screen from debugger attached. If you need more information don't hesitate to ask. Add Comment

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[Simone Bordet (JIRA)]

Simone Bordet commented on COMETD-596

Re: AcknowledgedMessagesSessionExtension - java.lang.ArrayIndexOutOfBoundsException in BatchArrayQueue.clearToBatch Your screenshot shows that batches is a long[16] with all values set to 0. This would be ok if the BatchArrayQueue has just been created, or if is empty. However, it also shows that the size of the queue is 9, so there is something really wrong here. Can you reproduce the issue in a test case ? The message acknowledge extension has been tested under high load conditions, and I have never seen this error, but it's always possible you hit an edge case, so it will be really great if you can reproduce the issue. Can you enable DEBUG logging for AcknowledgedMessagesSessionExtension ?

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[maroos (JIRA)]

maroos commented on COMETD-596

Re: AcknowledgedMessagesSessionExtension - java.lang.ArrayIndexOutOfBoundsException in BatchArrayQueue.clearToBatch

Hi, thanks for the update. Paweł (aka john_rambo) is on holidays right now - I'll try to look into it some time next week and provide an update.

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[john_rambo (JIRA)]

john_rambo commented on COMETD-596

Re: AcknowledgedMessagesSessionExtension - java.lang.ArrayIndexOutOfBoundsException in BatchArrayQueue.clearToBatch

Hi, I've attached logs for AcknowledgedMessagesSessionExtension and also for org.cometd.bayeux.server.ServerSession (it seems strange for me that exception is logged at INFO level and not ERROR level in org.cometd.bayeux.server.ServerSession - see logs attached there is INFO). I hope that this can help. If any further information is needed I will try to provide more data.

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[squiddle squiddle (JIRA)]

squiddle squiddle commented on COMETD-596

Re: AcknowledgedMessagesSessionExtension - java.lang.ArrayIndexOutOfBoundsException in BatchArrayQueue.clearToBatch

i cannot tell if this is related, but i can see this error if i am using jetty-9.3.1.v20150714 with cometd 3.0.5. It does not happen if i use the cometd 3.0.5 jetty version (jetty-9.2.12.v20150709)

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[Simone Bordet (JIRA)]

Simone Bordet commented on COMETD-596

Re: AcknowledgedMessagesSessionExtension - java.lang.ArrayIndexOutOfBoundsException in BatchArrayQueue.clearToBatch

CometD 3.0.x works with Jetty 9.2.x. CometD 3.1.x works with Jetty 9.3.x. I suggest you stick with the recommended pairings, although this issue will be investigated in CometD 3.1. Thanks !

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