title: org.jgroups.protocols.UDP - failed sending message to null
body: <pre><code>[hannel,192.168.0.46:40014] 15:08:03,642 - ERROR - org.jgroups.protocols.UDP - failed sending message to null (61 bytes)
  java.lang.Exception: dest=/225.1.2.46:30446 (64 bytes)
      at org.jgroups.protocols.UDP._send(UDP.java:333)
      at org.jgroups.protocols.UDP.sendToAllMembers(UDP.java:283)
      at org.jgroups.protocols.TP.doSend(TP.java:1327)
      at org.jgroups.protocols.TP.send(TP.java:1317)
      at org.jgroups.protocols.TP.down(TP.java:1038)
      at org.jgroups.protocols.PING.sendMcastDiscoveryRequest(PING.java:220)
      at org.jgroups.protocols.PING.sendGetMembersRequest(PING.java:214)
      at org.jgroups.protocols.Discovery$PingSenderTask$1.run(Discovery.java:385)
      at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
      at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:280)
      at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:135)
      at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:65)
      at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:142)
      at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:166)
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
      at java.lang.Thread.run(Thread.java:595)
  Caused by: java.io.InterruptedIOException: operation interrupted
      at java.net.PlainDatagramSocketImpl.send(Native Method)
      at java.net.DatagramSocket.send(DatagramSocket.java:612)
      at org.jgroups.protocols.UDP._send(UDP.java:324)
      ... 16 more
  </code></pre>
  
  <p>This is happening during load testing on the server.  Should I worry about it.  Aside from getting that message in the log, everything seem to work OK.</p>