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java.lang.NullPointerException: null	at com.alibaba.rocketmq.broker.BrokerController.headSlowTimeMills(BrokerController.java:423)	at com.alibaba.rocketmq.broker.BrokerController.headSlowTimeMills4PullThreadPoolQueue(BrokerController.java:436)	at com.alibaba.rocketmq.broker.BrokerController.printWaterMark(BrokerController.java:441)	at com.alibaba.rocketmq.broker.BrokerController$4.run(BrokerController.java:260)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)	at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)	at java.lang.Thread.run(Thread.java:662)