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Help debugging org.jivesoftware.openfire.muc. spi.MultiUserChatServiceImpl - Internal server error java.lang.NullPointerException

Question asked by Josh G on Jul 18, 2017
Latest reply on Jul 19, 2017 by Josh G

We're seeing an issue where MUC users are unable to post / receive messages from the chat rooms they're in, and it appears to directly corrolate with large volume of messages like this in the openfire error log:

 

2017.07.18 10:40:18 org.jivesoftware.openfire.muc.spi.MultiUserChatServiceImpl - Internal server error

java.lang.NullPointerException

        at org.jivesoftware.openfire.group.ConcurrentGroupMap.includesKey(ConcurrentGroupMap.java:49)

        at org.jivesoftware.openfire.muc.spi.LocalMUCRoom.joinRoom(LocalMUCRoom.java:642)

        at org.jivesoftware.openfire.muc.spi.LocalMUCUser.process(LocalMUCUser.java:471)

        at org.jivesoftware.openfire.muc.spi.LocalMUCUser.process(LocalMUCUser.java:177)

        at org.jivesoftware.openfire.muc.spi.MultiUserChatServiceImpl.processPacket(MultiUserChatServiceImpl.java:366)

        at org.jivesoftware.openfire.component.InternalComponentManager$RoutableComponents.process(InternalComponentManager.java:606)

        at org.jivesoftware.openfire.spi.RoutingTableImpl.routeToComponent(RoutingTableImpl.java:407)

        at org.jivesoftware.openfire.spi.RoutingTableImpl.routePacket(RoutingTableImpl.java:249)

        at org.jivesoftware.openfire.PresenceRouter.handle(PresenceRouter.java:166)

        at org.jivesoftware.openfire.PresenceRouter.route(PresenceRouter.java:80)

        at org.jivesoftware.openfire.spi.PacketRouterImpl.route(PacketRouterImpl.java:88)

        at org.jivesoftware.openfire.SessionPacketRouter.route(SessionPacketRouter.java:122)

        at org.jivesoftware.openfire.SessionPacketRouter.route(SessionPacketRouter.java:73)

        at org.jivesoftware.openfire.http.HttpSession.sendPendingPackets(HttpSession.java:641)

        at org.jivesoftware.openfire.http.HttpSession$HttpPacketSender.run(HttpSession.java:1284)

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

        at java.lang.Thread.run(Thread.java:748)

I didn't see anything obvious on ConcurrentGroupMap.java:49 which would trigger this. What could cause a NPE in org.jivesoftware.openfire.muc.spi.MultiUserChatServiceImpland how can we best debug / troubleshoot this?

 

We are using clustering, if that could affect things. Running Openfire v4.1.4 on Ubuntu Linux.

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