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java.lang.IllegalStateException: getAttribute: Session already invalidated	at org.apache.catalina.session.StandardSession.getAttribute(StandardSession.java:1175)	at org.apache.catalina.session.StandardSessionFacade.getAttribute(StandardSessionFacade.java:115)	at org.apache.shiro.web.session.HttpServletSession.getAttribute(HttpServletSession.java:146)	at org.apache.shiro.session.ProxiedSession.getAttribute(ProxiedSession.java:121)	at org.apache.shiro.subject.support.DelegatingSubject.getRunAsPrincipalsStack(DelegatingSubject.java:469)	at org.apache.shiro.subject.support.DelegatingSubject.getPrincipals(DelegatingSubject.java:153)	at org.apache.shiro.subject.support.DelegatingSubject.getPrincipal(DelegatingSubject.java:149)	at org.apache.shiro.web.servlet.ShiroHttpServletRequest.getSubjectPrincipal(ShiroHttpServletRequest.java:95)	at org.apache.shiro.web.servlet.ShiroHttpServletRequest.getUserPrincipal(ShiroHttpServletRequest.java:111)	at org.springframework.web.servlet.FrameworkServlet.getUsernameForRequest(FrameworkServlet.java:1079)	at org.springframework.web.servlet.FrameworkServlet.publishRequestHandledEvent(FrameworkServlet.java:1065)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:996)	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.eclipse.jetty.continuation.ContinuationFilter.doFilter(ContinuationFilter.java:137)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)	at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)