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java.lang.NullPointerException: null at com.sohu.cache.machine.impl.MachineCenterImpl.getMachineMemoryDetail(MachineCenterImpl.java:438)[classes!/:na] at com.sohu.cache.web.controller.AppManageController.fillAppMachineStat(AppManageController.java:518)[classes!/:na] at com.sohu.cache.web.controller.AppManageController.doInitAppScaleApply(AppManageController.java:348)[classes!/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[na:1.8.0_65] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[na:1.8.0_65] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[na:1.8.0_65] at java.lang.reflect.Method.invoke(Method.java:497)[na:1.8.0_65] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222)[spring-web-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)[spring-web-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)[spring-webmvc-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814)[spring-webmvc-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737)[spring-webmvc-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)[spring-webmvc-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)[spring-webmvc-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)[spring-webmvc-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:969)[spring-webmvc-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:860)[spring-webmvc-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:845)[spring-webmvc-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)[tomcat-embed-websocket-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextHeaderFilter.doFilterInternal(EndpointWebMvcAutoConfiguration.java:243)[spring-boot-actuator-1.3.1.RELEASE.jar!/:1.3.1.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)[spring-web-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:111)[spring-boot-actuator-1.3.1.RELEASE.jar!/:1.3.1.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)[spring-web-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)[spring-web-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)[spring-web-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:87)[spring-web-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)[spring-web-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)[spring-web-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)[spring-web-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)[spring-web-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)[spring-web-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:103)[spring-boot-actuator-1.3.1.RELEASE.jar!/:1.3.1.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)[spring-web-4.2.4.RELEASE.jar!/:4.2.4.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[na:1.8.0_65] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[na:1.8.0_65] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)[tomcat-embed-core-8.0.30.jar!/:8.0.30] at java.lang.Thread.run(Thread.java:745)[na:1.8.0_65]