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java.lang.NullPointerException: null	at org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:164)	at org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:199)	at org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter.attemptAuthentication(UsernamePasswordAuthenticationFilter.java:94)	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:212)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:121)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)	at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:89)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:784)	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:802)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1410)	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Thread.java:745)