net.sf.ehcache.ObjectExistsException: Cache shiro-activeSessionCache already exists

1、错误描述

严重: Servlet.service() for servlet [springmvc] in context with path [/cmp] threw exception [Filtered request failed.] with root cause
net.sf.ehcache.ObjectExistsException: Cache shiro-activeSessionCache already exists
	at net.sf.ehcache.CacheManager.addCache(CacheManager.java:1171)
	at org.apache.shiro.cache.ehcache.EhCacheManager.getCache(EhCacheManager.java:161)
	at org.apache.shiro.session.mgt.eis.CachingSessionDAO.createActiveSessionsCache(CachingSessionDAO.java:172)
	at org.apache.shiro.session.mgt.eis.CachingSessionDAO.getActiveSessionsCacheLazy(CachingSessionDAO.java:152)
	at org.apache.shiro.session.mgt.eis.CachingSessionDAO.getCachedSession(CachingSessionDAO.java:200)
	at org.apache.shiro.session.mgt.eis.CachingSessionDAO.readSession(CachingSessionDAO.java:259)
	at org.apache.shiro.session.mgt.DefaultSessionManager.retrieveSessionFromDataSource(DefaultSessionManager.java:236)
	at org.apache.shiro.session.mgt.DefaultSessionManager.retrieveSession(DefaultSessionManager.java:222)
	at org.apache.shiro.session.mgt.AbstractValidatingSessionManager.doGetSession(AbstractValidatingSessionManager.java:118)
	at org.apache.shiro.session.mgt.AbstractNativeSessionManager.lookupSession(AbstractNativeSessionManager.java:108)
	at org.apache.shiro.session.mgt.AbstractNativeSessionManager.getSession(AbstractNativeSessionManager.java:100)
	at org.apache.shiro.mgt.SessionsSecurityManager.getSession(SessionsSecurityManager.java:125)
	at org.apache.shiro.mgt.DefaultSecurityManager.resolveContextSession(DefaultSecurityManager.java:456)
	at org.apache.shiro.mgt.DefaultSecurityManager.resolveSession(DefaultSecurityManager.java:442)
	at org.apache.shiro.mgt.DefaultSecurityManager.createSubject(DefaultSecurityManager.java:338)
	at org.apache.shiro.subject.Subject$Builder.buildSubject(Subject.java:846)
	at org.apache.shiro.web.subject.WebSubject$Builder.buildWebSubject(WebSubject.java:148)
	at org.apache.shiro.web.servlet.AbstractShiroFilter.createSubject(AbstractShiroFilter.java:292)
	at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:359)
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	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.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:44)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

2、错误原因

      由错误提示可知，是cache shiro已存在，导致报错；这里是登录时，输入账号密码后，出现这个错误

3、解决办法

（1）清除浏览器缓存，重新登录系统

（2）关闭服务器，重新部署后启动服务器