[jira] [Created] (RIVER-467) NullPointerException when JoinManager is terminating

["Shawn Ellis (JIRA)" <ji...@apache.org>]

Shawn Ellis created RIVER-467:
---------------------------------

             Summary: NullPointerException when JoinManager is terminating
                 Key: RIVER-467
                 URL: https://issues.apache.org/jira/browse/RIVER-467
             Project: River
          Issue Type: Bug
          Components: com_sun_jini_lookup
    Affects Versions: River_3.0.0
            Reporter: Shawn Ellis
         Attachments: LeaseRenewalManager-NPE-1.patch

Every now and then I would encounter a NullPointerException with the JoinManager. The way that I was able to reproduce this problem was to have a service up and running and then switch the network on my laptop. For example, I would switch from one wifi network to another.

I've attached a patch that protects against the NullPointerException and seems to work fine when switching networks. [^LeaseRenewalManager-NPE-1.patch]
{code:java}
Oct 7 14:8:28 CDT SEVERE:thr 652:Exception in thread "LeaseRenewalManager_thread-3" 
Oct 7 14:8:28 CDT SEVERE:thr 652:java.lang.NullPointerException
Oct 7 14:8:28 CDT SEVERE:thr 652: at net.jini.lookup.JoinManager$ProxyReg.terminate(JoinManager.java:1266)
Oct 7 14:8:28 CDT SEVERE:thr 652: at net.jini.lookup.JoinManager.removeTasks(JoinManager.java:2774)
Oct 7 14:8:28 CDT SEVERE:thr 652: at net.jini.lookup.JoinManager.access$400(JoinManager.java:456)
Oct 7 14:8:28 CDT SEVERE:thr 652: at net.jini.lookup.JoinManager$ProxyReg$DiscLeaseListener.notify(JoinManager.java:1188)
Oct 7 14:8:28 CDT SEVERE:thr 652: at net.jini.lease.LeaseRenewalManager.tell(LeaseRenewalManager.java:1412)
Oct 7 14:8:28 CDT SEVERE:thr 652: at net.jini.lease.LeaseRenewalManager.access$500(LeaseRenewalManager.java:322)
Oct 7 14:8:28 CDT SEVERE:thr 652: at net.jini.lease.LeaseRenewalManager$RenewTask.run(LeaseRenewalManager.java:451)
Oct 7 14:8:28 CDT SEVERE:thr 652: at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
Oct 7 14:8:28 CDT SEVERE:thr 652: at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
Oct 7 14:8:28 CDT SEVERE:thr 652: at java.base/java.lang.Thread.run(Thread.java:844)
{code}



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