hytrix @HystrixCommand合并请求报错

Question

Exception in thread "hystrix-testService-3" Exception in thread "hystrix-testService-1" Exception in thread "hystrix-testService-2" java.lang.IllegalStateException: Fatal Exception thrown on Scheduler.Worker thread.
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:59)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:750)
Caused by: java.lang.RuntimeException: Failed executing wrapped Action0
    at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction.call(HystrixContexSchedulerAction.java:71)
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
    ... 5 more