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[Wicket-ja-user 286] Re: tomcat clusteringについて

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RYO exten****@gmail*****
2008年 12月 17日 (水) 23:47:31 JST 

矢野さん
ML情報ありがとうございます。

明日にでもさっそく試してフィードバックします。




On 2008/12/17, at 23:30, Tsutomu Yano <benbr****@mac*****> wrote:

> 矢野です。
>
> 一点確認したいのですが、もしかしてブラウザのCookie機能を全 
> 部オフにしたら
> 正常に動いたりしませんか？
>
> 過去に似たような話が英語MLに上がっていたときがあります。そ 
> のときは、hostの設定などなどの
> 関係で、クラスタに参加してる各サーバに同じJSESSIONIDが送ら 
> れないのが原因であったようです。
>
> http://www.nabble.com/Tomcat-6-clustering-problem-tt18112263.html#a18112263
>
> もしCookieをオフにして正常に動くようであれば、同様の話とい 
> うことになりますが...
>
>
>
> On 2008/12/17, at 23:17, RYO wrote:
>
>> 木村さんありがとうございます。
>> Wicketのバグということで理解しました。バグとして当現象があが 
>> ってい
>> ないか、確認してみます。
>>
>> ただ、一点確認させて下さい。
>> Jboss asでは動作するというのは、なぜでしょうか？
>>
>> セッションレプリケーションの仕組みの違いですか？
>>
>> Jbossは、全然さわったことがないので、ちょっと見当がつかなか 
>> ったの
>> で、もし良ければ教えてください。
>>
>>
>> On 2008/12/17, at 18:15, "Takayoshi Kimura" <takay****@gmail*****>  
>> wrote:
>>
>>> 面白いエラーですね。
>>>
>>> 原因はHttpSessionに格納されるWicketのクラス 
>>> の復元処
>>> 理にコンテキス
>>> ト依存というかスレッド依存の部分がある(Application.get())
>>> ためです。
>>> 結果的にレプリケーションは失敗してます。Wicketにバグ登録
>>> (カテゴリ
>>> はバグというよりエンハンスメントかな)するのが良い 
>>> でしょう
>>> ね。
>>>
>>> JBoss ASならそのまんまで動作すると思います :-)
>>>
>>> Regards,
>>> Yet another Kimura
>>>
>>> 2008/12/17 木村亮 <exten****@gmail*****>:
>>>> みなさん。はじめまして、ryo といいます。
>>>>
>>>> はじめて、投稿させていただきます。よろしくお願いします。
>>>>
>>>> wicketを利用してアプリケーション開発を行っていて、
>>>> どうしてもうまくない現象がおこってしまいます。質問させてくだ
>>>> さい。
>>>>
>>>> [アプリの大まかな構成]
>>>> ・wicket 1.4-m3
>>>> ・google-guice 1.0
>>>> ・quartz (job sched) 1.6.2
>>>> [サーバ構成]
>>>> ・apache
>>>> ・mod_jk
>>>> ・tomcat-5.5.23 (options -Xms256m -Xmx512 -XX:PermSize=64m
>>>> -XX:MaxPermSize=128m)
>>>>  ・(tomcat物理サーバが3台、バランシングはしてお
>>>> らず、
>>>>  セッションレプリケーション(SimpleTcpClusterを利用)
>>>> のみを行う。スティッキーセッションは無効です。)
>>>>  ・同一tomcatインスタンスには、他にも5つ6つ
>>>> サービスがのっています。
>>>>  ・tomcat　server.xmlは以下のような感じです。
>>>> 　※http://cwiki.apache.org/WICKET/tomcat-clustering.html
>>>> に記述してあるCluster定義とほぼ、一緒です。
>>>> 　異なる点はSenderのreplicationModeがsynchronous
>>>> ではなく、pooledを指定、expireSessionsOnShutdown
>>>> を"true"にしています。
>>>>
>>>> <Cluster  
>>>> className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
>>>> managerClassName="org.apache.catalina.cluster.session.DeltaManager"
>>>> expireSessionsOnShutdown="true"
>>>> useDirtyFlag="true">
>>>>
>>>> <Membership
>>>> className="org.apache.catalina.cluster.mcast.McastService"
>>>> mcastAddr="XXXXXXXX"
>>>> mcastPort="XXXXXXXX"
>>>> mcastFrequency="500"
>>>> mcastDropTime="3000"/>
>>>>
>>>> <Receiver
>>>> className="org.apache.catalina.cluster.tcp.ReplicationListener"
>>>> tcpListenAddress="auto"　← /etc/hostsをみにいく
>>>> tcpListenPort="XXXXXXX"
>>>> tcpSelectorTimeout="100"
>>>> tcpThreadCount="2"/>
>>>>
>>>> <Sender
>>>> className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
>>>> replicationMode="pooled"/>
>>>>
>>>> <Valve
>>>> className="org.apache.catalina.cluster.tcp.ReplicationValve"
>>>> filter=".*\.gif;.*\.js;.*\.jpg;.*\.htm;.*\.html;.*\.txt;.*\.css"/>
>>>> </Cluster>
>>>>
>>>> 以上の状況で、アプリにリクエストを送ると、以下のよう 
>>>> な例外が吐
>>>> かれます。
>>>> 2008/12/16 19:26:04  
>>>> org.apache.catalina.cluster.session.DeltaManager
>>>> messageReceived
>>>> 致命的: Manager [/context]: Unable to receive message through
>>>> TCP channel
>>>> java.lang.IllegalArgumentException: Unknown object type null
>>>>      at
>>>> org.
>>>> apache.
>>>> wicket.
>>>> protocol.
>>>> http.
>>>> pagestore.
>>>> DiskPageStore.restoreAfterSerialization(DiskPageStore.java:1215)
>>>>      at
>>>> org.apache.wicket.protocol.http.SecondLevelCacheSessionStore
>>>> $SecondLevelCachePageMap.
>>>> readObject(SecondLevelCacheSessionStore.java:
>>>> 406)flect.NativeMethodAccessorImpl.invoke0(Native
>>>> Method)
>>>>      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>>>      at
>>>> sun.
>>>> reflect.
>>>> NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>>>>      at
>>>> sun.
>>>> reflect.
>>>> DelegatingMethodAccessorImpl.
>>>> invoke(DelegatingMethodAccessorImpl.java:25)
>>>>      at java.lang.reflect.Method.invoke(Method.java:585)
>>>>      at
>>>> java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:
>>>> 946)
>>>>      at
>>>> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java: 
>>>> 1809)
>>>>      at
>>>> java. 
>>>> io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:
>>>> 1719)
>>>>      at
>>>> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
>>>>      at
>>>> java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
>>>>      at
>>>> org.apache.catalina.cluster.session.DeltaRequest
>>>> $AttributeInfo.readExternal(DeltaRequest.java:335)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaRequest.readExternal(DeltaRequest.java:247)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaManager.loadDeltaRequest(DeltaManager.java: 
>>>> 698)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaManager.handleSESSION_DELTA(DeltaManager.java:
>>>> 1573)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaManager.messageReceived(DeltaManager.java: 
>>>> 1523)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaManager.messageDataReceived(DeltaManager.java:
>>>> 1272)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.
>>>> session.
>>>> ClusterSessionListener.messageReceived(ClusterSessionListener.java:
>>>> 86)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina. 
>>>> cluster.tcp.SimpleTcpCluster.receive(SimpleTcpCluster.java:
>>>> 1168)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.
>>>> tcp.
>>>> ClusterReceiverBase.messageDataReceived(ClusterReceiverBase.java: 
>>>> 427)
>>>>      at
>>>> org.
>>>> apache.catalina.cluster.io.ObjectReader.execute(ObjectReader.java:
>>>> 108)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.
>>>> tcp.TcpReplicationThread.drainChannel(TcpReplicationThread.java: 
>>>> 139)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.tcp.TcpReplicationThread.run(TcpReplicationThread.java:70)
>>>> Exception in thread
>>>> "org.apache.catalina.cluster.tcp.TcpReplicationThread[1]"
>>>> java.lang.ExceptionInInitializerError
>>>>      at sun.misc.Unsafe.ensureClassInitialized(Native Method)
>>>>      at
>>>> sun.
>>>> reflect.
>>>> UnsafeFieldAccessorFactory.
>>>> newFieldAccessor(UnsafeFieldAccessorFactory.java:25)
>>>>      at
>>>> sun.
>>>> reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:
>>>> 122)
>>>>      at java.lang.reflect.Field.acquireFieldAccessor(Field.java:
>>>> 917)
>>>>      at java.lang.reflect.Field.getFieldAccessor(Field.java:898)
>>>>      at java.lang.reflect.Field.getLong(Field.java:527)
>>>>      at
>>>> java.io.ObjectStreamClass.getDeclaredSUID(ObjectStreamClass.java:
>>>> 1586)
>>>>      at java.io.ObjectStreamClass.access
>>>> $700(ObjectStreamClass.java:52)
>>>>      at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:408)
>>>>      at java.security.AccessController.doPrivileged(Native Method)
>>>>      at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:
>>>> 400)
>>>>      at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:
>>>> 297)
>>>>      at
>>>> java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:531)
>>>>      at
>>>> java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:
>>>> 1552)
>>>>      at
>>>> java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java: 
>>>> 1466)
>>>>      at
>>>> java. 
>>>> io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:
>>>> 1699)
>>>>      at
>>>> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
>>>>      at
>>>> java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
>>>>      at
>>>> org.apache.wicket.protocol.http.SecondLevelCacheSessionStore
>>>> $SecondLevelCachePageMap.
>>>> readObject(SecondLevelCacheSessionStore.java:403)
>>>>      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>>>      at
>>>> sun.
>>>> reflect.
>>>> NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>>>>      at
>>>> sun.
>>>> reflect.
>>>> DelegatingMethodAccessorImpl.
>>>> invoke(DelegatingMethodAccessorImpl.java:25)
>>>>      at java.lang.reflect.Method.invoke(Method.java:585)
>>>>      at
>>>> java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:
>>>> 946)
>>>>      at
>>>> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java: 
>>>> 1809)
>>>>      at
>>>> java. 
>>>> io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:
>>>> 1719)
>>>>      at
>>>> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
>>>>      at
>>>> java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
>>>>      at
>>>> org.apache.catalina.cluster.session.DeltaRequest
>>>> $AttributeInfo.readExternal(DeltaRequest.java:335)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaRequest.readExternal(DeltaRequest.java:247)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaManager.loadDeltaRequest(DeltaManager.java: 
>>>> 698)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaManager.handleSESSION_DELTA(DeltaManager.java:
>>>> 1573)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaManager.messageReceived(DeltaManager.java: 
>>>> 1523)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaManager.messageDataReceived(DeltaManager.java:
>>>> 1272)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.
>>>> session.
>>>> ClusterSessionListener.messageReceived(ClusterSessionListener.java:
>>>> 86)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina. 
>>>> cluster.tcp.SimpleTcpCluster.receive(SimpleTcpCluster.java:
>>>> 1168)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.
>>>> tcp.
>>>> ClusterReceiverBase.messageDataReceived(ClusterReceiverBase.java: 
>>>> 427)
>>>>      at
>>>> org.
>>>> apache.catalina.cluster.io.ObjectReader.execute(ObjectReader.java:
>>>> 108)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.
>>>> tcp.TcpReplicationThread.drainChannel(TcpReplicationThread.java: 
>>>> 139)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.tcp.TcpReplicationThread.run(TcpReplicationThread.java:70)
>>>> Caused by: org.apache.wicket.WicketRuntimeException: There is no
>>>> application
>>>> attached to current thread
>>>> org.apache.catalina.cluster.tcp.TcpReplicationThread[1]
>>>>      at org.apache.wicket.Application.get(Application.java:177)
>>>>      at org.apache.wicket.Component.getApplication(Component.java:
>>>> 1277)
>>>>      at org.apache.wicket.Component.<init>(Component.java:893)
>>>>      at
>>>> org.apache.wicket.MarkupContainer.<init>(MarkupContainer.java:108)
>>>>      at org.apache.wicket.Page.<init>(Page.java:238)
>>>>      at
>>>> org.apache.wicket.protocol.http.pagestore.SerializedPagesCache
>>>> $SerializedPageWithSession$1.<init>(SerializedPagesCache.java:206)
>>>>      at
>>>> org.apache.wicket.protocol.http.pagestore.SerializedPagesCache
>>>> $SerializedPageWithSession.<clinit>(SerializedPagesCache.java:205)
>>>>      ... 40 more
>>>> Exception in thread
>>>> "org.apache.catalina.cluster.tcp.TcpReplicationThread[2]"
>>>> java.lang.ExceptionInInitializerError
>>>>      at sun.misc.Unsafe.ensureClassInitialized(Native Method)
>>>>      at
>>>> sun.
>>>> reflect.
>>>> UnsafeFieldAccessorFactory.
>>>> newFieldAccessor(UnsafeFieldAccessorFactory.java:25)
>>>>      at
>>>> sun.
>>>> reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:
>>>> 122)
>>>>      at java.lang.reflect.Field.acquireFieldAccessor(Field.java:
>>>> 917)
>>>>      at java.lang.reflect.Field.getFieldAccessor(Field.java:898)
>>>>      at java.lang.reflect.Field.getLong(Field.java:527)
>>>>      at
>>>> java.io.ObjectStreamClass.getDeclaredSUID(ObjectStreamClass.java:
>>>> 1586)
>>>>      at java.io.ObjectStreamClass.access
>>>> $700(ObjectStreamClass.java:52)
>>>>      at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:408)
>>>>      at java.security.AccessController.doPrivileged(Native Method)
>>>>      at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:
>>>> 400)
>>>>      at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:
>>>> 297)
>>>>      at
>>>> java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:531)
>>>>      at
>>>> java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:
>>>> 1552)
>>>>      at
>>>> java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java: 
>>>> 1466)
>>>>      at
>>>> java. 
>>>> io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:
>>>> 1699)
>>>>      at
>>>> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
>>>>      at
>>>> java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
>>>>      at
>>>> org.apache.wicket.protocol.http.SecondLevelCacheSessionStore
>>>> $SecondLevelCachePageMap.
>>>> readObject(SecondLevelCacheSessionStore.java:403)
>>>>      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>>>      at
>>>> sun.
>>>> reflect.
>>>> NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>>>>      at
>>>> sun.
>>>> reflect.
>>>> DelegatingMethodAccessorImpl.
>>>> invoke(DelegatingMethodAccessorImpl.java:25)
>>>>      at java.lang.reflect.Method.invoke(Method.java:585)
>>>>      at
>>>> java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:
>>>> 946)
>>>>      at
>>>> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java: 
>>>> 1809)
>>>>      at
>>>> java. 
>>>> io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:
>>>> 1719)
>>>>      at
>>>> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
>>>>      at
>>>> java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
>>>>      at
>>>> org.apache.catalina.cluster.session.DeltaRequest
>>>> $AttributeInfo.readExternal(DeltaRequest.java:335)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaRequest.readExternal(DeltaRequest.java:247)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaManager.loadDeltaRequest(DeltaManager.java: 
>>>> 698)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaManager.handleSESSION_DELTA(DeltaManager.java:
>>>> 1573)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaManager.messageReceived(DeltaManager.java: 
>>>> 1523)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.session.DeltaManager.messageDataReceived(DeltaManager.java:
>>>> 1272)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.
>>>> session.
>>>> ClusterSessionListener.messageReceived(ClusterSessionListener.java:
>>>> 86)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina. 
>>>> cluster.tcp.SimpleTcpCluster.receive(SimpleTcpCluster.java:
>>>> 1168)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.
>>>> tcp.
>>>> ClusterReceiverBase.messageDataReceived(ClusterReceiverBase.java: 
>>>> 427)
>>>>      at
>>>> org.
>>>> apache.catalina.cluster.io.ObjectReader.execute(ObjectReader.java:
>>>> 108)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.
>>>> tcp.TcpReplicationThread.drainChannel(TcpReplicationThread.java: 
>>>> 139)
>>>>      at
>>>> org.
>>>> apache.
>>>> catalina.
>>>> cluster.tcp.TcpReplicationThread.run(TcpReplicationThread.java:70)
>>>>
>>>> Caused by: org.apache.wicket.WicketRuntimeException: There is no
>>>> application
>>>> attached to current thread
>>>> org.apache.catalina.cluster.tcp.TcpReplicationThread[1]
>>>>      at org.apache.wicket.Application.get(Application.java:177)
>>>>      at org.apache.wicket.Component.getApplication(Component.java:
>>>> 1277)
>>>>      at org.apache.wicket.Component.<init>(Component.java:893)
>>>>      at
>>>> org.apache.wicket.MarkupContainer.<init>(MarkupContainer.java:108)
>>>>      at org.apache.wicket.Page.<init>(Page.java:238)
>>>>      at
>>>> org.apache.wicket.protocol.http.pagestore.SerializedPagesCache
>>>> $SerializedPageWithSession$1.<init>(SerializedPagesCache.java:206)
>>>>      at
>>>> org.apache.wicket.protocol.http.pagestore.SerializedPagesCache
>>>> $SerializedPageWithSession.<clinit>(SerializedPagesCache.java:205)
>>>>      ... 40
>>>> moreorg.apache.catalina.cluster.tcp.TcpReplicationThread
>>>>
>>>> このスタックトレースを見る限りだ
>>>> と、org.apache.catalina.cluster.tcp.TcpReplicationThread
>>>> のThreadLocalからApplicationオブジェクト 
>>>> が取得でき
>>>> ずに、
>>>> WicketRuntimeExceptionをはいています。
>>>>
>>>> これは、単純に、セッションレプリケーションができてい 
>>>> ないとみな
>>>> してよいでしょうか？
>>>> tomcatの一時領域には、disk page storeファイルが 
>>>> 出力されて
>>>> いました。(1台のみ)
>>>>
>>>> スタックトレースの
>>>> at
>>>> org.
>>>> apache.
>>>> wicket.
>>>> protocol.
>>>> http.
>>>> pagestore.
>>>> DiskPageStore.restoreAfterSerialization(DiskPageStore.java:1215)
>>>> のソースを追ってみると、SecondLevelCacheSessionStore
>>>> $SecondLevelCachePageMap
>>>> クラスの以下の箇所で、IllegalArgumentException 
>>>> が投げられ
>>>> ていました。
>>>>
>>>> private void readObject(java.io.ObjectInputStream s) throws
>>>> IOException,
>>>>          ClassNotFoundException
>>>>      {
>>>>          s.defaultReadObject();
>>>>
>>>>          IPageStore store = getPageStore();
>>>>
>>>>          if (sessionId != null && store instanceof
>>>> IClusteredPageStore ==
>>>> false)
>>>>          {
>>>>              Object lastPage = s.readObject();
>>>>              if (store instanceof ISerializationAwarePageStore)
>>>>              {
>>>>                  lastPage =
>>>> (
>>>> (
>>>> ISerializationAwarePageStore
>>>> )store).restoreAfterSerialization((Serializable)lastPage);　
>>>> ←ここ
>>>>              }
>>>>              this.lastPage = lastPage;
>>>>          }
>>>>      }
>>>>
>>>> DiskPageStore.restoreAfterSerializationメソッド、
>>>>
>>>> 　/**
>>>>   * @see
>>>> org.
>>>> apache.
>>>> wicket.
>>>> protocol.
>>>> http.
>>>> SecondLevelCacheSessionStore.
>>>> ISerializationAwarePageStore#
>>>> restoreAfterSerialization(java.io.Serializable)
>>>>   */
>>>>  public Object restoreAfterSerialization(Serializable serializable)
>>>>  {
>>>>      if (!storeAfterSessionReplication() || serializable
>>>> instanceof Page)
>>>>      {
>>>>          return serializable;
>>>>      }
>>>>      else if (serializable instanceof SerializedPageWithSession)
>>>>      {
>>>>          SerializedPageWithSession page =
>>>> (SerializedPageWithSession)serializable;
>>>>          if (page.page == null || page.page.get() !=
>>>> SerializedPageWithSession.NO_PAGE)
>>>>          {
>>>>              storeSerializedPages(page.sessionId, page.pages);
>>>>              return stripSerializedPage(page);
>>>>          }
>>>>          else
>>>>          {
>>>>              return page;
>>>>          }
>>>>      }
>>>>      else
>>>>      {
>>>>          String type = serializable != null ?
>>>> serializable.getClass().getName() : null;
>>>>          throw new IllegalArgumentException("Unknown object type
>>>> " +
>>>> type);　←ここでIllegalArgumentExceptionがスロー
>>>>      }
>>>>  }
>>>> 引数に渡されるserializable(SecondLevelCacheSessionStore
>>>> $SecondLevelCachePageMap#readObject(ObjectInputStream 
>>>> から読み込
>>>> んだlastPage)がnullのため、IllegalArgumentExce 
>>>> ption
>>>> をスローしていました。
>>>> なぜ、このような状況になるのかの原因の切り分けが現状 
>>>> できていま
>>>> せん。
>>>>
>>>> 何か、参考になるようなことがあれば、ご教授いただきた 
>>>> く投稿させ
>>>> ていただきました。
>>>> 以上よろしくお願いいたします。
>>>>
>>>> _______________________________________________
>>>> Wicket-ja-user mailing list
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>>>>
>>>>
>>>
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