I wish to run a function for every user with a session at regular intervals that will check if a user is active. If not active, the function will remove the user from the list of users in the servlet context and clear the user session.I wish to run a function for every user with a
阅读背景：
我可以使用什么来为在tomcat上运行的java servlet中的每个会话实现后台进程？
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