Unable to execute redis command normally.] with root cause

springboot版本2.3.4，shiro-redis版本2.3.0
运行一段时间后，有时会报这个错误
[org.apache.shiro.cache.CacheException: org.iherus.shiro.exception.ExecutionException: Unable to execute redis command normally.] with root cause
java.lang.NullPointerException: null
	at org.iherus.shiro.util.Utils.findMethod(Utils.java:752)
	at org.iherus.shiro.util.Utils.invokeMethod(Utils.java:840)
	at org.iherus.shiro.util.Utils.invokeMethod(Utils.java:835)
	at org.iherus.shiro.cache.redis.RedisCache.lambda$selectDatabase$1(RedisCache.java:112)
	at java.util.Optional.ifPresent(Optional.java:159)
	at org.iherus.shiro.cache.redis.RedisCache.selectDatabase(RedisCache.java:112)
	at org.iherus.shiro.cache.redis.RedisCache.lambda$put$3(RedisCache.java:158)
	at org.iherus.shiro.cache.redis.AbstractRedisOperations$DefaultRedisOperations.execute(AbstractRedisOperations.java:91)
	at org.iherus.shiro.cache.redis.RedisCache.put(RedisCache.java:157)
	at org.iherus.shiro.cache.redis.RedisSessionDAO.cache(RedisSessionDAO.java:155)
	at org.apache.shiro.session.mgt.eis.CachingSessionDAO.cache(CachingSessionDAO.java:235)
	at org.apache.shiro.session.mgt.eis.CachingSessionDAO.create(CachingSessionDAO.java:185)
	at org.apache.shiro.session.mgt.DefaultSessionManager.create(DefaultSessionManager.java:177)
	at org.apache.shiro.session.mgt.DefaultSessionManager.doCreateSession(DefaultSessionManager.java:158)
	at org.apache.shiro.session.mgt.AbstractValidatingSessionManager.createSession(AbstractValidatingSessionManager.java:136)
	at org.apache.shiro.session.mgt.AbstractNativeSessionManager.start(AbstractNativeSessionManager.java:99)
	at org.apache.shiro.mgt.SessionsSecurityManager.start(SessionsSecurityManager.java:152)
	at org.apache.shiro.subject.support.DelegatingSubject.getSession(DelegatingSubject.java:340)
	at org.apache.shiro.subject.support.DelegatingSubject.getSession(DelegatingSubject.java:316)
	at org.apache.shiro.web.util.WebUtils.saveRequest(WebUtils.java:622)
	at org.apache.shiro.web.filter.AccessControlFilter.saveRequest(AccessControlFilter.java:208)
	at org.apache.shiro.web.filter.AccessControlFilter.saveRequestAndRedirectToLogin(AccessControlFilter.java:191)
	at org.apache.shiro.web.filter.authc.UserFilter.onAccessDenied(UserFilter.java:66)
	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:214)
	at org.apache.shiro.web.filter.PathMatchingFilter.preHandle(PathMatchingFilter.java:189)
	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:450)
	at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
	at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
	at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
	at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:387)
	at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:124)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$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)

BYStudio/shiro-redis

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