[jboss-jira] [JBoss JIRA] (JGRP-1567) RetransmitTask throws NPE

[Radim Vansa (JIRA)]

Radim Vansa created JGRP-1567:
---------------------------------

             Summary: RetransmitTask throws NPE
                 Key: JGRP-1567
                 URL: https://issues.jboss.org/browse/JGRP-1567
             Project: JGroups
          Issue Type: Bug
    Affects Versions: 3.2.6
            Reporter: Radim Vansa
            Assignee: Bela Ban


When the message is sent down the stack for a new destination a {{SenderEntry}} is inserted into {{send_table}}. This entry, however, contains no messages yet, and, therefore, as the RetransmitTask in {{triggerXmit}} retrieves the first message, it gets null and throws NPE.

{code}
08:19:05,716 ERROR [org.jgroups.util.TimeScheduler2] (Timer-2,edg-perf09-2672) failed running task UNICAST2: RetransmitTask (interval=500 ms)
java.lang.NullPointerException
	at org.jgroups.protocols.UNICAST2.triggerXmit(UNICAST2.java:1326)
	at org.jgroups.protocols.UNICAST2$RetransmitTask.run(UNICAST2.java:1294)
	at org.jgroups.util.TimeScheduler2$RecurringTask.run(TimeScheduler2.java:591)
	at org.jgroups.util.TimeScheduler2$MyTask.run(TimeScheduler2.java:523)
	at org.jgroups.util.TimeScheduler2$Entry.execute(TimeScheduler2.java:428)
	at org.jgroups.util.TimeScheduler2$1.run(TimeScheduler2.java:286)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)
{code}

Theoretically there is another race condition in the {{SenderEntry.getFirstMessage()}} itself - the low value may change between the {{getLow}} and {{get}} calls, but I am not sure when this may happen.

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