Java线程转储中的“等待时释放锁:”是什么意思?
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在此线程转储中:
INFO | jvm 3 | 2011/06/08 13:36:12 | \"ExecuteThread: \'38\' for queue: \'default\'\" id=55 idx=0x78 tid=5316 prio=5 alive, in native, waiting, daemon
INFO | jvm 3 | 2011/06/08 13:36:12 | -- Waiting for notification on: weblogic/ejb20/locks/ExclusiveLockManager$LockWaiter@0x25EF8828[fat lock]
INFO | jvm 3 | 2011/06/08 13:36:12 | at jrockit/vm/Threads.waitForSignal(J)Z(Native Method)
INFO | jvm 3 | 2011/06/08 13:36:12 | at java/lang/Object.wait(J)V(Native Method)[optimized]
INFO | jvm 3 | 2011/06/08 13:36:12 | at weblogic/ejb20/locks/ExclusiveLockManager$LockBucket.lock(Ljava/lang/Object;Ljava/lang/Object;I)Z(ExclusiveLockManager.java:504)[optimized]
INFO | jvm 3 | 2011/06/08 13:36:12 | ^-- Lock released while waiting: weblogic/ejb20/locks/ExclusiveLockManager$LockWaiter@0x25EF8828[fat lock]
INFO | jvm 3 | 2011/06/08 13:36:12 | at weblogic/ejb20/locks/ExclusiveLockManager.lock(Ljava/lang/Object;Ljava/lang/Object;I)Z(ExclusiveLockManager.java:261)[optimized]
INFO | jvm 3 | 2011/06/08 13:36:12 | at weblogic/ejb20/manager/ExclusiveEntityManager.acquireLock(Ljava/lang/Object;Ljavax/transaction/Transaction;I)Z(ExclusiveEntityManager.java:210)[inlined]
INFO | jvm 3 | 2011/06/08 13:36:12 | at weblogic/ejb20/manager/ExclusiveEntityManager.getReadyBean(Ljava/lang/Object;Ljavax/transaction/Transaction;I)Ljavax/ejb/EntityBean;(ExclusiveEntityManager.java:267)[inlined]
INFO | jvm 3 | 2011/06/08 13:36:12 | at weblogic/ejb20/manager/ExclusiveEntityManager.preInvoke(Lweblogic/ejb20/internal/InvocationWrapper;)Ljavax/ejb/EnterpriseBean;(ExclusiveEntityManager.java:242)[optimized]
INFO | jvm 3 | 2011/06/08 13:36:12 | at weblogic/ejb20/internal/BaseEJBObject.preInvoke(Lweblogic/ejb20/internal/InvocationWrapper;Lweblogic/security/service/ContextHandler;)Lweblogic/ejb20/internal/InvocationWrapper;(BaseEJBObject.java:152)[inlined]
INFO | jvm 3 | 2011/06/08 13:36:12 | at weblogic/ejb20/internal/EntityEJBObject.preInvoke(Lweblogic/ejb20/internal/MethodDescriptor;Lweblogic/security/service/ContextHandler;)Lweblogic/ejb20/internal/InvocationWrapper;(EntityEJBObject.java:104)[inlined]
INFO | jvm 3 | 2011/06/08 13:36:12 | at foob/ejb/commodity/ejb_Commodity_etfd4i_EOImpl.getData()Lfoob/ejb/commodity/db/CommodityData;(ejb_Commodity_etfd4i_EOImpl.java:701)[optimized]
INFO | jvm 3 | 2011/06/08 13:36:12 | at foob/ejb/item/OurItem.loadCommodityData()V(OurItem.java:172)[optimized]
INFO | jvm 3 | 2011/06/08 13:36:12 | ^-- Holding lock: java/lang/Class@0x067EA070[fat lock]
INFO | jvm 3 | 2011/06/08 13:36:12 | at foob/ejb/item/OurItem.getCommodityData()Lfoob/ejb/commodity/db/CommodityData;(OurItem.java:251)
INFO | jvm 3 | 2011/06/08 13:36:12 | at foob/ejb/item/OurItem.getTheControlGid()Ljava/lang/String;(OurItem.java:259)
INFO | jvm 3 | 2011/06/08 13:36:12 | at foob/business/shipment/OurThing.getTheControlGid(Lfoob/util/jdbc/OurConnection;)Ljava/lang/String;(OurThing.java:379)
行什么
Lock released while waiting: weblogic/ejb20/locks/ExclusiveLockManager$LockWaiter@0x25EF8828
意思?我们还有其他8个线程被阻塞,等待释放java/lang/Class@0x067EA070
,该线程正在等待该线程,但是我不知道该线程在阻塞什么,也不知道该锁已释放。我本来以为线程转储是事件的世界停止类型,因此问题所在的行不会引用线程转储发生时释放的锁...
另外,它出现的地方是否有任何意义(即它上面和下面的线)?
显然,我不是Java期望者,所以我希望这不是一个愚蠢的问题。谢谢您的帮助!
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3 个回复
苏髓骗撩
更新资料 在查看堆栈跟踪时,似乎您正在使用实体EJB Bean,并且鉴于此类实现的操作方式,通常会在实体EJB上获取锁。这实际上取决于用于管理必须访问数据库的并发事务的并发策略。我会怀疑bean的数量太少,或者只有一个bean要锁定。
癸痊醒
傻寺俊擒
wait()将释放当前持有的锁(由周围的同步块持有的锁),并等待notify()信号。