JGroups subsystem TimerSchedulerAdapter throws UOE when using timer-executor

07:42:39,535 WARNING [org.jgroups.protocols.UDP] (DiagnosticsHandler,default,perf17-37478) Could not retrieve value of attribute (method) getNumTimerTasks: java.lang.reflect.InvocationTargetException
[JBoss] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.6.0_24]
[JBoss] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [:1.6.0_24]
[JBoss] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_24]
[JBoss] at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_24]
[JBoss] at org.jgroups.stack.Protocol.dumpStats(Protocol.java:272) [jgroups-2.12.1.Final.jar:]
[JBoss] at org.jgroups.stack.ProtocolStack.dumpStats(ProtocolStack.java:310) [jgroups-2.12.1.Final.jar:]
[JBoss] at org.jgroups.JChannel.dumpStats(JChannel.java:687) [jgroups-2.12.1.Final.jar:]
[JBoss] at org.jgroups.JChannel$MyProbeHandler.handleProbe(JChannel.java:2099) [jgroups-2.12.1.Final.jar:]
[JBoss] at org.jgroups.protocols.TP$DiagnosticsHandler.handleDiagnosticProbe(TP.java:2165) [jgroups-2.12.1.Final.jar:]
[JBoss] at org.jgroups.protocols.TP$DiagnosticsHandler.run(TP.java:2137) [jgroups-2.12.1.Final.jar:]
[JBoss] at java.lang.Thread.run(Thread.java:662) [:1.6.0_24]
[JBoss] Caused by: java.lang.UnsupportedOperationException
[JBoss] at org.jboss.as.clustering.jgroups.TimerSchedulerAdapter.getExecutor(TimerSchedulerAdapter.java:168) [jboss-as-clustering-jgroups-7.1.0.Alpha1-SNAPSHOT.jar:7.1.0.Alpha1-SNAPSHOT]
[JBoss] at org.jboss.as.clustering.jgroups.TimerSchedulerAdapter.size(TimerSchedulerAdapter.java:153) [jboss-as-clustering-jgroups-7.1.0.Alpha1-SNAPSHOT.jar:7.1.0.Alpha1-SNAPSHOT]
[JBoss] at org.jgroups.protocols.TP.getNumTimerTasks(TP.java:714) [jgroups-2.12.1.Final.jar:]
[JBoss] ... 11 more