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POwhy java.util.HashMap.getEntry can block my program?
 

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  1. POwhy java.util.HashMap.getEntry can block my program?
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    <p>my program had been blocked , I used the jstack commander to analyze, the following thread took the lock "0x0000000603f02ae0" , and others threads couldn't fetch the lock.<br> I had waited at least one hour, but the thread didn't unlock , my question is why the thread'state is RUNNING, and stop at java.util.HashMap.getEntry(HashMap.java:347) ? it is oracle(sun) JDK's bug ?</p> <p>my jdk version :<br> java version "1.6.0_21"<br> Java(TM) SE Runtime Environment (build 1.6.0_21-b06)<br> Java HotSpot(TM) 64-Bit Server VM (build 17.0-b16, mixed mode)</p> <p>The thread info:<br> "PandoraScheduleTrigger-thread-5" prio=10 tid=0x00000000443b0800 nid=0x5804 runnable [0x0000000043722000] java.lang.Thread.State: RUNNABLE at java.util.HashMap.getEntry(HashMap.java:347) at java.util.HashMap.containsKey(HashMap.java:335) at com.youlongqingfeng.pandora.context.ArmiesContext._getArmy(ArmiesContext.java:239) at com.youlongqingfeng.pandora.context.ArmiesContext.getArmiesByCityId(ArmiesContext.java:169) at com.youlongqingfeng.pandora.model.City.getTotalApplianceMap(City.java:4519) at com.youlongqingfeng.pandora.model.City.calculateMemoryResource(City.java:4636) at com.youlongqingfeng.pandora.model.City.buildTaskFinish(City.java:1089) at com.youlongqingfeng.pandora.map.unit.ZhouMapResourceUnit.buildTaskFinish(ZhouMapResourceUnit.java:1618) - <strong>locked &lt;0x0000000603f02ae0></strong> (a com.youlongqingfeng.pandora.map.unit.ZhouMapResourceUnit) at com.youlongqingfeng.pandora.trigger.BuildTrigger.innerRun(BuildTrigger.java:39) at com.youlongqingfeng.gameserver.utils.threadpool.CancelTrigger.run(CancelTrigger.java:34)</p> <p>Blocked thread dump:</p> <p>"PandoraScheduleTrigger-thread-3" prio=10 tid=0x0000000044c7c000 nid=0x5802 waiting for monitor entry [0x0000000043520000] java.lang.Thread.State: BLOCKED (on object monitor) at com.youlongqingfeng.pandora.map.unit.ZhouMapResourceUnit.armiesGroupReturnBack(ZhouMapResourceUnit.java:2279) - <strong>waiting to lock &lt;0x0000000603f02ae0></strong> (a com.youlongqingfeng.pandora.map.unit.ZhouMapResourceUnit) at com.youlongqingfeng.pandora.trigger.ArmyGroupArrivedTrigger.innerRun(ArmyGroupArrivedTrigger.java:53) at com.youlongqingfeng.gameserver.utils.threadpool.CancelTrigger.run(CancelTrigger.java:34) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:207) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619)</p> <p>thank you.</p>
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    1. USPeter Lee
    1. USPeter Lee
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    1. COWhich other threads are running at the same time - specifically, is there another thread that is accessing the same resource?
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      1. POwhy java.util.HashMap.getEntry can block my program?
      1. USWill A
 

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