shiro整合redis出现的问题

 shiro-redis是网上的大牛开源的一个插件（github地址：https://github.com/alexxiyang/shiro-redis ），最近在用它的时候老是报如下错误（版本是3.1.0）：

We need a field to identify this Cache Object in Redis. So you need to defined an id field which you can get unique id to identify this principal. For example, if you use UserInfo as Principal class, the id field maybe userId, userName, email, etc. For example, getUserId(), getUserName(), getEmail(), etc.
Default value is authCacheKey or id, that means your principal object has a method called “getAuthCacheKey()” or “getId()”] with root cause
org.crazycake.shiro.exception.PrincipalInstanceException: class com.xxx.blog.base.LoginBean must has getter for field: authCacheKey or id
We need a field to identify this Cache Object in Redis. So you need to defined an id field which you can get unique id to identify this principal. For example, if you use UserInfo as Principal class, the id field maybe userId, userName, email, etc. For example, getUserId(), getUserName(), getEmail(), etc.
Default value is authCacheKey or id, that means your principal object has a method called “getAuthCacheKey()” or “getId()”
at org.crazycake.shiro.RedisCache.getRedisKeyFromPrincipalIdField(RedisCache.java:150)
at org.crazycake.shiro.RedisCache.getStringRedisKey(RedisCache.java:126)
at org.crazycake.shiro.RedisCache.getRedisCacheKey(RedisCache.java:118)
at org.crazycake.shiro.RedisCache.remove(RedisCache.java:103)
at org.apache.shiro.realm.AuthorizingRealm.clearCachedAuthorizationInfo(AuthorizingRealm.java:386)
at org.apache.shiro.realm.AuthorizingRealm.doClearCache(AuthorizingRealm.java:663)
at org.apache.shiro.realm.CachingRealm.clearCache(CachingRealm.java:170)
at org.apache.shiro.realm.CachingRealm.onLogout(CachingRealm.java:152)
at org.apache.shiro.authc.pam.ModularRealmAuthenticator.onLogout(ModularRealmAuthenticator.java:290)
at org.apache.shiro.mgt.DefaultSecurityManager.logout(DefaultSecurityManager.java:562)
at org.apache.shiro.subject.support.DelegatingSubject.logout(DelegatingSubject.java:367)
at com.huangbl.blog.filter.CheckSessionControlFilter.onAccessDenied(CheckSessionControlFilter.java:94)
at org.apache.shiro.web.filter.AccessControlFilter.onAccessDenied(AccessControlFilter.java:133)
at org.apache.shiro.web.filter.AccessControlFilter.onPreHandle(AccessControlFilter.java:162)
at org.apache.shiro.web.filter.PathMatchingFilter.isFilterChainContinued(PathMatchingFilter.java:203)
at org.apache.shiro.web.filter.PathMatchingFilter.preHandle(PathMatchingFilter.java:178)
at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:131)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)atorg.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)atorg.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)atorg.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:387)atorg.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)atorg.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)atorg.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)atorg.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)atorg.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)atorg.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)atorg.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)atorg.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)atorg.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)atorg.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)atorg.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)atorg.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)atjava.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)atjava.util.concurrent.ThreadPoolExecutor$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)

大致意思是principal对象中必须要有authCacheKey或者id属性，且要有其对应的get方法。我特意去检查了下，我的loginBean中是有id属性的，但是是继承自父类的属性，问题就出在这里，应该我当时用的版本（3.1.0）是没有考虑到从父类去读取id属性的情况，把版本换成3.2.3立马就可以了（作者也在github中说过不要使用3.1.0以下版本，怪我自己没去注意）

然后这边要写对应的唯一id