我有一个Spring Boot应用程序，它引发以下错误：
在路径为[]的上下文中，用于servlet [dispatcherServlet]的Servlet.service（）抛出异常
这是NullPointerException，但我不知道怎么做
java.lang.NullPointerException：空 在org.springframework.security.web.authentication.rememberme.TokenBasedRememberMeServices.processAutoLoginCookie（TokenBasedRememberMeServices.java:134）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.authentication.rememberme.AbstractRememberMeServices.autoLogin（AbstractRememberMeServices.java:130）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter（RememberMeAuthenticationFilter.java:98）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:331）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter（SecurityContextHolderAwareRequestFilter.java:170）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:331）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter（RequestCacheAwareFilter.java:63）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:331）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter（AbstractAuthenticationProcessingFilter.java:200）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:331）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.authentication.logout.LogoutFilter.doFilter（LogoutFilter.java:116）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:331）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.csrf.CsrfFilter.doFilterInternal（CsrfFilter.java:100）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）〜[spring-web-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:331）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal（HeaderWriterFilter.java:64）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）〜[spring-web-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:331）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter（SecurityContextPersistenceFilter.java:105）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:331）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal（WebAsyncManagerIntegrationFilter.java:56）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）〜[spring-web-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:331）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.FilterChainProxy.doFilterInternal（FilterChainProxy.java:214）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.security.web.FilterChainProxy.doFilter（FilterChainProxy.java:177）〜[spring-security-web-4.2.2.RELEASE.jar：4.2.2.RELEASE] 在org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate（DelegatingFilterProxy.java:346）〜[spring-web-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.web.filter.DelegatingFilterProxy.doFilter（DelegatingFilterProxy.java:262）〜[spring-web-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:192）〜[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:165）〜[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.springframework.web.filter.RequestContextFilter.doFilterInternal（RequestContextFilter.java:99）〜[spring-web-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）〜[spring-web-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:192）〜[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:165）〜[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal（HttpPutFormContentFilter.java:105）〜[spring-web-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）〜[spring-web-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:192）〜[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:165）〜[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal（HiddenHttpMethodFilter.java:81）〜[spring-web-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）〜[spring-web-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:192）〜[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:165）〜[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal（CharacterEncodingFilter.java:197）〜[spring-web-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）〜[spring-web-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:192）〜[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:165）〜[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:198）〜[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:96）[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:474）[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:140）[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:79）[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:87）[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:349）上[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.coyote.http11.Http11Processor.service（Http11Processor.java:783）[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.coyote.AbstractProcessorLight.process（AbstractProcessorLight.java:66）[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.coyote.AbstractProtocol $ ConnectionHandler.process（AbstractProtocol.java:798）[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1434）[tomcat-embed-core-8.5.11.jar：8.5.11] 在org.apache.tomcat.util.net.SocketProcessorBase.run（SocketProcessorBase.java:49）上[tomcat-embed-core-8.5.11.jar：8.5.11] 在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1149）[na：1.8.0_181] 在java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:624）[na：1.8.0_181] 在org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）[tomcat-embed-core-8.5.11.jar：8.5.11] 在java.lang.Thread.run（Thread.java:748）[na：1.8.0_181]