JobScheduler Universal agent throws an error akka.dispatch.Dispatcher - SetOnce has not been set java.lang.IllegalStateException: SetOnce has not been set

Current Situation

• The customer run a large number of tasks running on JobScheduler universal agent.
• intermittently agent throws an error

• 2019-07-02 05:42:05,165 +0200 [ERROR] akka.dispatch.Dispatcher - SetOnce has not been set
  java.lang.IllegalStateException: SetOnce has not been set
  	at com.sos.scheduler.engine.common.scalautil.SetOnce$$anonfun$apply$1.apply(SetOnce.scala:19)
  	at com.sos.scheduler.engine.common.scalautil.SetOnce$$anonfun$apply$1.apply(SetOnce.scala:19)
  	at com.sos.scheduler.engine.common.scalautil.SetOnce.getOrElse(SetOnce.scala:31)
  	at com.sos.scheduler.engine.common.scalautil.SetOnce.apply(SetOnce.scala:19)
  	at com.sos.scheduler.engine.tunnel.server.Connector$inactivityWatchdog$$anonfun$restart$1$$anonfun$apply$1.apply$mcV$sp(Connector.scala:60)
  	at com.sos.scheduler.engine.common.time.timer.Timer$$anonfun$onElapsed$1.apply(Timer.scala:29)
  	at com.sos.scheduler.engine.common.time.timer.Timer$$anonfun$onElapsed$1.apply(Timer.scala:28)
  	at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:36)
  	at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55)
  	at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:91)
  	at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
  	at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
  	at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72)
  	at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:90)
  	at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39)
  	at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:415)
  	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
  	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
  	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
  	at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) 

Desired Situation

• The Universal Agent should not throw the error akka.dispatch.Dispatcher - SetOnce has not been set java.lang.IllegalStateException: SetOnce has not been set

Maintainers Note

• This issue we as caused by incompatible patch from JS-1851 deployed to agent release 1.12.7.
• The JS-1851 provided a patch for release 1.12.9 but user has deployed the patch to release 1.12.7, which has caused this error.
• The JobScheduler and Universal Agents are working as expected.