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单项选择题 What code， inserted at line 21， is called prior to a session being migrated to a different JVM assuming the web application containing MyExample is deployed in a container which supports distributed applications？（）

A、 public void valueUnbound（HttpSessionEvent ev）{...}

B、 public void sessionPassivated（HttpSessionEvent ev）{...}

C、 public void sessionDidActivate（HttpSessionEvent ev）{...}

D、 public void sessionWillPassivate（HttpSessionEvent ev）{...}

  • D

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