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From "Mark Brouwer (JIRA)" <j...@apache.org>
Subject [jira] Created: (RIVER-23) Closing down a LookupDiscovery instance resulted in NPE
Date Sun, 06 May 2007 22:19:15 GMT
Closing down a LookupDiscovery instance resulted in NPE

                 Key: RIVER-23
                 URL: https://issues.apache.org/jira/browse/RIVER-23
             Project: River
          Issue Type: Bug
            Reporter: Mark Brouwer
         Assigned To: Mark Brouwer
            Priority: Minor

Shutting down a Seven instance resulted in the following NPE.
INFO: JSC Service with ID is being destroyed, container managed
resources will be released
05-Jan-2007 18:21:51 org.cheiron.util.thread.ThreadPoolImpl$WorkerThread run
WARNING: unexpected exception while running user task
        at net.jini.discovery.LookupDiscovery$AnnouncementInfo.access$2702(LookupDiscovery.java:3222)
        at net.jini.discovery.LookupDiscovery$DecodeAnnouncementTask.run(LookupDiscovery.java:1392)
        at net.jini.discovery.LookupDiscovery$PacketListenerImpl.deliverAnnouncement(LookupDiscovery.java:1162)
        at com.sun.jini.discovery.AnnouncementDelivery$ALWrapper$ALTaskManagerDeliveryTask.run(AnnouncementDelivery.java:705)
        at org.cheiron.util.thread.VirtualTaskManager$ShareableTask.run(VirtualTaskManager.java:416)
        at org.cheiron.util.thread.ThreadPoolImpl$ContextTask$1.run(ThreadPoolImpl.java:1527)
        at org.cheiron.seven.security.ContextSecurityManager$4.run(ContextSecurityManager.java:410)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.cheiron.util.thread.ThreadPoolImpl$ContextTask.run(ThreadPoolImpl.java:1522)
        at org.cheiron.util.thread.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:2657)

Note that the line numbers are different from the ones in the latest public release of the
JTSK, this is due to modifications made by both Sun and the Cheiron project. But the code
responsible for the NPE can be found in the current codebase as well: 

if (pending instanceof CheckGroupsMarker) {
    synchronized(registrars) {
        // Since this is a valid announcement, update the
        // sequence number.
        AnnouncementInfo aInfo =
            (AnnouncementInfo) regInfo.get(srvcID);
        aInfo.seqNum = ann.getSequenceNumber();

Apparently it is possible a lookup service is removed from the map for ServiceID to multicast
announcements while an announce packet is still queued for being analyzed.

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