When we submit a timer task to a timer, but - before the timer is scheduled - it is cancelled, then we get the exception below.
SOLUTION: simply catch and eat the exception

@FD_SOCK Ping thread 09:43:17,125 ERROR [jgroups] uncaught exception in Thread[FD_SOCK Ping thread,5,JGroups threads] (thread group=org.jgroups.util.Util$1[name=JGroups threads,maxpri=10] )
java.lang.IllegalStateException: Timer already cancelled.
at java.util.Timer.sched(Timer.java:354)
at java.util.Timer.schedule(Timer.java:170)
at org.jgroups.util.TimeScheduler.schedule(TimeScheduler.java:125)
at org.jgroups.util.TimeScheduler.add(TimeScheduler.java:112)
at org.jgroups.protocols.FD_SOCK$BroadcastTask.addSuspectedMember(FD_SOCK.java:1186)
at org.jgroups.protocols.FD_SOCK.broadcastSuspectMessage(FD_SOCK.java:721)
at org.jgroups.protocols.FD_SOCK.run(FD_SOCK.java:453)
at java.lang.Thread.run(Thread.java:595)