这意味着您已在会话中放置了一个不可序列化的对象，并且您已在服务器停止时启用了会话持久性。

This means you have put an object in the session that is not serializable, and you have enabled session persistence on server stop.

您有多种选择：

• 使有问题的类实现 Serializable


• 将其从 sessionDestroyed（..）的会话中删除 HttpSessionListener


• 如果它是会话中存储的另一个类的成员，请将其设为 transient


• 只是忽略错误

• make the class in question implement Serializable
• remove it from the session on sessionDestroyed(..) of a HttpSessionListener
• if it is a member of another class stored in the session, make it transient
• simply ignore the error

你还应该清理tomcat的work目录，这样就不会有先前的序列化会话已经恢复。

You should also clean the "work" directory of tomcat so that no previous serialized session is restored.