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とWeblogic 9、JRockitWebLogic の 2 つのノードでアプリケーションを実行しています。
アプリケーションがコンパイルされ、展開され、数時間正常に実行された後、次のエラーが発生しました。 

java.lang.NoClassDefFoundError: net/sf/ehcache/concurrent/LockType
    at net.sf.ehcache.store.FrontEndCacheTier.readLock(FrontEndCacheTier.java:632)
    at net.sf.ehcache.store.FrontEndCacheTier.getKeys(FrontEndCacheTier.java:485)
    at net.sf.ehcache.Cache.getKeys(Cache.java:1913)
    at org.terracotta.modules.ehcache.store.servermap.OnlineEhcacheSMLocalStore.getKeys(OnlineEhcacheSMLocalStore.java:44)
    at org.terracotta.modules.ehcache.store.servermap.EhcacheSMLocalStore.getKeys(EhcacheSMLocalStore.java:82)
    at com.terracotta.toolkit.collections.servermap.L1ServerMapLocalCacheStoreImpl.getKeys(L1ServerMapLocalCacheStoreImpl.java:51)
    at com.tc.object.servermap.localcache.impl.ServerMapLocalCacheImpl.clear(ServerMapLocalCacheImpl.java:247)
    at com.tc.object.TCObjectServerMapImpl.clearLocalCache(TCObjectServerMapImpl.java:600)
    at com.terracotta.toolkit.collections.ConcurrentDistributedServerMapDsoApplicator.hydrate(ConcurrentDistributedServerMapDsoApplicator.java:145)
    at com.tc.object.TCClassImpl.hydrate(TCClassImpl.java:199)
    at com.tc.object.TCObjectImpl.hydrate(TCObjectImpl.java:113)
    at com.tc.object.tx.ClientTransactionManagerImpl.basicApply(ClientTransactionManagerImpl.java:350)
    at com.tc.object.tx.ClientTransactionManagerImpl.apply(ClientTransactionManagerImpl.java:378)
    at com.tc.object.handler.ReceiveTransactionHandler.handleEvent(ReceiveTransactionHandler.java:100)
    at com.tc.async.impl.StageImpl$WorkerThread.run(StageImpl.java:145)  

<04.07.2012 13:28:54 MSD> Notice WebLogicServer BEA-000388 JVM called WLS shutdown hook. The server will force shutdown now  

<04.07.2012 13:28:54 MSD> Alert WebLogicServer BEA-000396 Server shutdown has been requested by WLS Kernel
Exception in thread "Thread-42" java.lang.NoClassDefFoundError: net/sf/ehcache/concurrent/LockType
    at net.sf.ehcache.store.FrontEndCacheTier.writeLock(FrontEndCacheTier.java:644)
    at net.sf.ehcache.store.FrontEndCacheTier.removeAll(FrontEndCacheTier.java:503)
    at net.sf.ehcache.Cache.removeAll(Cache.java:2461)
    at net.sf.ehcache.Cache.removeAll(Cache.java:2446)
    at org.terracotta.modules.ehcache.store.servermap.OnlineEhcacheSMLocalStore.clear(OnlineEhcacheSMLocalStore.java:13

ご覧のとおり、WebLogic はこのエラーを受け取った後、両方のノードをシャットダウンすることにしました。ランタイム中
の理由は何ですか? NoClassDefFoundErrorこのクラスLockTypeは、実行時にアンロードする必要があることを意味するこのエラーの前に使用する必要があると思いますよね?

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