Page needs a session and none is available] with root cause
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异常：
当访问web项目时，控制台输出Page needs a session and none is available] with root cause相关异常
以下内容有待验证
原因：
%tomcat_home%\work\Catalina\localhost\项目——这个文件夹下缺少SESSIONS.ser这个文件
解决办法：
删除%tomcat_home%\work\Catalina\localhost\项目，取消%tomcat_home%\conf\context.xml中禁用session持久化(<Manager pathname="" />)注释，然后重新启动tomcat
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