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    <title>question Re: Server error has occurred in Support Questions</title>
    <link>https://community.cloudera.com/t5/Support-Questions/Server-error-has-occurred/m-p/16304#M28315</link>
    <description>After my datanode stopped abruptly this issue is been coming . Now when i try to add new hosts to cluster , Under Currently managed hosts I see "null" . I am unable to delete this . What should i do to resolve this error &lt;span class="lia-unicode-emoji" title=":disappointed_face:"&gt;😞&lt;/span&gt;</description>
    <pubDate>Fri, 01 Aug 2014 11:01:39 GMT</pubDate>
    <dc:creator>Balakumar90</dc:creator>
    <dc:date>2014-08-01T11:01:39Z</dc:date>
    <item>
      <title>Server error has occurred</title>
      <link>https://community.cloudera.com/t5/Support-Questions/Server-error-has-occurred/m-p/16300#M28313</link>
      <description>&lt;P&gt;Hello ,&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;One of my datanode stopped working , By mistake &lt;STRONG&gt;/etc/init.d/network stop&lt;/STRONG&gt; is been used . After then i resolved the issue and tried opening my CM . Then I am seeing this error&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;DIV class="modal-body"&gt;&lt;P&gt;A server error has occurred. Send the following information to Cloudera.&lt;/P&gt;&lt;P&gt;&lt;STRONG&gt;Path: &lt;A target="_blank" href="http://127.0.0.1:7180/cmf/services/landingPageStatusContent"&gt;http://127.0.0.1:7180/cmf/services/landingPageStatusContent&lt;/A&gt;&lt;/STRONG&gt;&lt;/P&gt;&lt;P&gt;&lt;STRONG&gt;Version: Cloudera Enterprise Data Hub Edition Trial 5.0.2 (#297 built by jenkins on 20140606-2221 git: 80907df78ba6b50c21a598f0caff8b00685d5961) &lt;/STRONG&gt;&lt;/P&gt;&lt;DIV&gt;&lt;DIV class="Toggler errorSummary alert alert-error"&gt;&lt;STRONG&gt;com.google.common.util.concurrent.UncheckedExecutionException&lt;/STRONG&gt;:java.lang.NullPointerException&lt;BR /&gt;at &lt;STRONG&gt;LocalCache.java line 2263&lt;/STRONG&gt;&lt;BR /&gt;in com.google.common.cache.LocalCache$Segment get()&lt;/DIV&gt;&lt;DIV class="errorDetails"&gt;Stack Trace:&lt;OL&gt;&lt;LI&gt;&lt;STRONG&gt;LocalCache.java line 2263&lt;/STRONG&gt;&lt;BR /&gt;in com.google.common.cache.LocalCache$Segment get()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LocalCache.java line 4000&lt;/STRONG&gt;&lt;BR /&gt;in com.google.common.cache.LocalCache get()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LocalCache.java line 4789&lt;/STRONG&gt;&lt;BR /&gt;in com.google.common.cache.LocalCache$LocalManualCache get()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LandingPageController.java line 1030&lt;/STRONG&gt;&lt;BR /&gt;in com.cloudera.server.web.cmf.LandingPageController getHealthInfo()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LandingPageController.java line 241&lt;/STRONG&gt;&lt;BR /&gt;in com.cloudera.server.web.cmf.LandingPageController servicesTable()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;line -1&lt;/STRONG&gt;&lt;BR /&gt;in sun.reflect.GeneratedMethodAccessor704 invoke()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;DelegatingMethodAccessorImpl.java line 43&lt;/STRONG&gt;&lt;BR /&gt;in sun.reflect.DelegatingMethodAccessorImpl invoke()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;Method.java line 606&lt;/STRONG&gt;&lt;BR /&gt;in java.lang.reflect.Method invoke()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HandlerMethodInvoker.java line 176&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.bind.annotation.support.HandlerMethodInvoker invokeHandlerMethod()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;AnnotationMethodHandlerAdapter.java line 436&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter invokeHandlerMethod()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;AnnotationMethodHandlerAdapter.java line 424&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;DispatcherServlet.java line 790&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.servlet.DispatcherServlet doDispatch()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;DispatcherServlet.java line 719&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.servlet.DispatcherServlet doService()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FrameworkServlet.java line 669&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.servlet.FrameworkServlet processRequest()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FrameworkServlet.java line 585&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.servlet.FrameworkServlet doPost()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HttpServlet.java line 595&lt;/STRONG&gt;&lt;BR /&gt;in javax.servlet.http.HttpServlet service()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HttpServlet.java line 668&lt;/STRONG&gt;&lt;BR /&gt;in javax.servlet.http.HttpServlet service()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHolder.java line 511&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHolder handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHandler.java line 1221&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;UserAgentFilter.java line 78&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.servlet.UserAgentFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;GzipFilter.java line 131&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.servlet.GzipFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHandler.java line 1212&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;JAMonServletFilter.java line 48&lt;/STRONG&gt;&lt;BR /&gt;in com.jamonapi.http.JAMonServletFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHandler.java line 1212&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;JavaMelodyFacade.java line 109&lt;/STRONG&gt;&lt;BR /&gt;in com.cloudera.enterprise.JavaMelodyFacade$MonitoringFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHandler.java line 1212&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 311&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterSecurityInterceptor.java line 116&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.access.intercept.FilterSecurityInterceptor invoke()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterSecurityInterceptor.java line 83&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.access.intercept.FilterSecurityInterceptor doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ExceptionTranslationFilter.java line 113&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.access.ExceptionTranslationFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;SessionManagementFilter.java line 101&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.session.SessionManagementFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;AnonymousAuthenticationFilter.java line 113&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.authentication.AnonymousAuthenticationFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;RememberMeAuthenticationFilter.java line 146&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;SecurityContextHolderAwareRequestFilter.java line 54&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;RequestCacheAwareFilter.java line 45&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.savedrequest.RequestCacheAwareFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;AbstractAuthenticationProcessingFilter.java line 182&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LogoutFilter.java line 105&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.authentication.logout.LogoutFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;SecurityContextPersistenceFilter.java line 87&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.context.SecurityContextPersistenceFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ConcurrentSessionFilter.java line 125&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.session.ConcurrentSessionFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 173&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;DelegatingFilterProxy.java line 237&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.filter.DelegatingFilterProxy invokeDelegate()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;DelegatingFilterProxy.java line 167&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.filter.DelegatingFilterProxy doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHandler.java line 1212&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;CharacterEncodingFilter.java line 88&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.filter.CharacterEncodingFilter doFilterInternal()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;OncePerRequestFilter.java line 76&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.filter.OncePerRequestFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHandler.java line 1212&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHandler.java line 399&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHandler handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;SecurityHandler.java line 216&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.security.SecurityHandler handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;SessionHandler.java line 182&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.SessionHandler handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;SecurityHandler.java line 216&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.security.SecurityHandler handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ContextHandler.java line 766&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.handler.ContextHandler handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;WebAppContext.java line 450&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.webapp.WebAppContext handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HandlerWrapper.java line 152&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.handler.HandlerWrapper handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;StatisticsHandler.java line 53&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.handler.StatisticsHandler handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HandlerWrapper.java line 152&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.handler.HandlerWrapper handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;Server.java line 326&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.Server handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HttpConnection.java line 542&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.HttpConnection handleRequest()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HttpConnection.java line 928&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.HttpConnection$RequestHandler headerComplete()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HttpParser.java line 549&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.HttpParser parseNext()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HttpParser.java line 212&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.HttpParser parseAvailable()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HttpConnection.java line 404&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.HttpConnection handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;SelectChannelEndPoint.java line 410&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.io.nio.SelectChannelEndPoint run()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;QueuedThreadPool.java line 582&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.thread.QueuedThreadPool$PoolThread run()&lt;/LI&gt;&lt;/OL&gt;&lt;DIV class="errorCauses"&gt;&lt;DIV class="Toggler errorSummary alert alert-error"&gt;&lt;STRONG&gt;Caused by: java.lang.NullPointerException&lt;/STRONG&gt;:&lt;BR /&gt;at &lt;STRONG&gt;Preconditions.java line 191&lt;/STRONG&gt;&lt;BR /&gt;in com.google.common.base.Preconditions checkNotNull()&lt;/DIV&gt;&lt;DIV class="errorDetails"&gt;Stack Trace:&lt;OL&gt;&lt;LI&gt;&lt;STRONG&gt;Preconditions.java line 191&lt;/STRONG&gt;&lt;BR /&gt;in com.google.common.base.Preconditions checkNotNull()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;AbstractHealthNode.java line 23&lt;/STRONG&gt;&lt;BR /&gt;in com.cloudera.cmon.kaiser.graph.AbstractHealthNode &amp;lt;init&amp;gt;()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HostHealthNode.java line 27&lt;/STRONG&gt;&lt;BR /&gt;in com.cloudera.cmon.kaiser.graph.HostHealthNode &amp;lt;init&amp;gt;()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HealthGraph.java line 134&lt;/STRONG&gt;&lt;BR /&gt;in com.cloudera.cmon.kaiser.graph.HealthGraph create()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LandingPageController.java line 568&lt;/STRONG&gt;&lt;BR /&gt;in com.cloudera.server.web.cmf.LandingPageController$HealthInfo &amp;lt;init&amp;gt;()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LandingPageController.java line 1035&lt;/STRONG&gt;&lt;BR /&gt;in com.cloudera.server.web.cmf.LandingPageController$2 call()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LandingPageController.java line 1032&lt;/STRONG&gt;&lt;BR /&gt;in com.cloudera.server.web.cmf.LandingPageController$2 call()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LocalCache.java line 4792&lt;/STRONG&gt;&lt;BR /&gt;in com.google.common.cache.LocalCache$LocalManualCache$1 load()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LocalCache.java line 3599&lt;/STRONG&gt;&lt;BR /&gt;in com.google.common.cache.LocalCache$LoadingValueReference loadFuture()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LocalCache.java line 2379&lt;/STRONG&gt;&lt;BR /&gt;in com.google.common.cache.LocalCache$Segment loadSync()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LocalCache.java line 2342&lt;/STRONG&gt;&lt;BR /&gt;in com.google.common.cache.LocalCache$Segment lockedGetOrLoad()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LocalCache.java line 2257&lt;/STRONG&gt;&lt;BR /&gt;in com.google.common.cache.LocalCache$Segment get()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LocalCache.java line 4000&lt;/STRONG&gt;&lt;BR /&gt;in com.google.common.cache.LocalCache get()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LocalCache.java line 4789&lt;/STRONG&gt;&lt;BR /&gt;in com.google.common.cache.LocalCache$LocalManualCache get()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LandingPageController.java line 1030&lt;/STRONG&gt;&lt;BR /&gt;in com.cloudera.server.web.cmf.LandingPageController getHealthInfo()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LandingPageController.java line 241&lt;/STRONG&gt;&lt;BR /&gt;in com.cloudera.server.web.cmf.LandingPageController servicesTable()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;line -1&lt;/STRONG&gt;&lt;BR /&gt;in sun.reflect.GeneratedMethodAccessor704 invoke()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;DelegatingMethodAccessorImpl.java line 43&lt;/STRONG&gt;&lt;BR /&gt;in sun.reflect.DelegatingMethodAccessorImpl invoke()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;Method.java line 606&lt;/STRONG&gt;&lt;BR /&gt;in java.lang.reflect.Method invoke()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HandlerMethodInvoker.java line 176&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.bind.annotation.support.HandlerMethodInvoker invokeHandlerMethod()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;AnnotationMethodHandlerAdapter.java line 436&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter invokeHandlerMethod()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;AnnotationMethodHandlerAdapter.java line 424&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;DispatcherServlet.java line 790&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.servlet.DispatcherServlet doDispatch()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;DispatcherServlet.java line 719&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.servlet.DispatcherServlet doService()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FrameworkServlet.java line 669&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.servlet.FrameworkServlet processRequest()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FrameworkServlet.java line 585&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.servlet.FrameworkServlet doPost()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HttpServlet.java line 595&lt;/STRONG&gt;&lt;BR /&gt;in javax.servlet.http.HttpServlet service()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HttpServlet.java line 668&lt;/STRONG&gt;&lt;BR /&gt;in javax.servlet.http.HttpServlet service()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHolder.java line 511&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHolder handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHandler.java line 1221&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;UserAgentFilter.java line 78&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.servlet.UserAgentFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;GzipFilter.java line 131&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.servlet.GzipFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHandler.java line 1212&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;JAMonServletFilter.java line 48&lt;/STRONG&gt;&lt;BR /&gt;in com.jamonapi.http.JAMonServletFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHandler.java line 1212&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;JavaMelodyFacade.java line 109&lt;/STRONG&gt;&lt;BR /&gt;in com.cloudera.enterprise.JavaMelodyFacade$MonitoringFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHandler.java line 1212&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 311&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterSecurityInterceptor.java line 116&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.access.intercept.FilterSecurityInterceptor invoke()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterSecurityInterceptor.java line 83&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.access.intercept.FilterSecurityInterceptor doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ExceptionTranslationFilter.java line 113&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.access.ExceptionTranslationFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;SessionManagementFilter.java line 101&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.session.SessionManagementFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;AnonymousAuthenticationFilter.java line 113&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.authentication.AnonymousAuthenticationFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;RememberMeAuthenticationFilter.java line 146&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;SecurityContextHolderAwareRequestFilter.java line 54&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;RequestCacheAwareFilter.java line 45&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.savedrequest.RequestCacheAwareFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;AbstractAuthenticationProcessingFilter.java line 182&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;LogoutFilter.java line 105&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.authentication.logout.LogoutFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;SecurityContextPersistenceFilter.java line 87&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.context.SecurityContextPersistenceFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ConcurrentSessionFilter.java line 125&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.session.ConcurrentSessionFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 323&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;FilterChainProxy.java line 173&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.security.web.FilterChainProxy doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;DelegatingFilterProxy.java line 237&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.filter.DelegatingFilterProxy invokeDelegate()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;DelegatingFilterProxy.java line 167&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.filter.DelegatingFilterProxy doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHandler.java line 1212&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;CharacterEncodingFilter.java line 88&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.filter.CharacterEncodingFilter doFilterInternal()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;OncePerRequestFilter.java line 76&lt;/STRONG&gt;&lt;BR /&gt;in org.springframework.web.filter.OncePerRequestFilter doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHandler.java line 1212&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ServletHandler.java line 399&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.ServletHandler handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;SecurityHandler.java line 216&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.security.SecurityHandler handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;SessionHandler.java line 182&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.servlet.SessionHandler handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;SecurityHandler.java line 216&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.security.SecurityHandler handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;ContextHandler.java line 766&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.handler.ContextHandler handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;WebAppContext.java line 450&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.webapp.WebAppContext handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HandlerWrapper.java line 152&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.handler.HandlerWrapper handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;StatisticsHandler.java line 53&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.handler.StatisticsHandler handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HandlerWrapper.java line 152&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.handler.HandlerWrapper handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;Server.java line 326&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.Server handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HttpConnection.java line 542&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.HttpConnection handleRequest()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HttpConnection.java line 928&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.HttpConnection$RequestHandler headerComplete()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HttpParser.java line 549&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.HttpParser parseNext()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HttpParser.java line 212&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.HttpParser parseAvailable()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;HttpConnection.java line 404&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.jetty.HttpConnection handle()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;SelectChannelEndPoint.java line 410&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.io.nio.SelectChannelEndPoint run()&lt;/LI&gt;&lt;LI&gt;&lt;STRONG&gt;QueuedThreadPool.java line 582&lt;/STRONG&gt;&lt;BR /&gt;in org.mortbay.thread.QueuedThreadPool$PoolThread run()&lt;/LI&gt;&lt;/OL&gt;&lt;/DIV&gt;&lt;/DIV&gt;&lt;/DIV&gt;&lt;/DIV&gt;&lt;/DIV&gt;&lt;P&gt;Please help .&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;Thanks&lt;/P&gt;&lt;P&gt;Bala&lt;/P&gt;</description>
      <pubDate>Fri, 16 Sep 2022 09:04:02 GMT</pubDate>
      <guid>https://community.cloudera.com/t5/Support-Questions/Server-error-has-occurred/m-p/16300#M28313</guid>
      <dc:creator>Balakumar90</dc:creator>
      <dc:date>2022-09-16T09:04:02Z</dc:date>
    </item>
    <item>
      <title>Re: Server error has occurred</title>
      <link>https://community.cloudera.com/t5/Support-Questions/Server-error-has-occurred/m-p/16302#M28314</link>
      <description>Below details present in server.log files .&lt;BR /&gt;&lt;BR /&gt;2014-08-01 03:58:29,707 WARN [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0:resourcepool.BasicResourcePool@1841] com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@1cfc6e18 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (5). Last acquisition attempt exception:&lt;BR /&gt;org.postgresql.util.PSQLException: FATAL: the database system is shutting down&lt;BR /&gt;at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:291)&lt;BR /&gt;at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:108)&lt;BR /&gt;at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:66)&lt;BR /&gt;at org.postgresql.jdbc2.AbstractJdbc2Connection.&amp;lt;init&amp;gt;(AbstractJdbc2Connection.java:125)&lt;BR /&gt;at org.postgresql.jdbc3.AbstractJdbc3Connection.&amp;lt;init&amp;gt;(AbstractJdbc3Connection.java:30)&lt;BR /&gt;at org.postgresql.jdbc3g.AbstractJdbc3gConnection.&amp;lt;init&amp;gt;(AbstractJdbc3gConnection.java:22)&lt;BR /&gt;at org.postgresql.jdbc4.AbstractJdbc4Connection.&amp;lt;init&amp;gt;(AbstractJdbc4Connection.java:30)&lt;BR /&gt;at org.postgresql.jdbc4.Jdbc4Connection.&amp;lt;init&amp;gt;(Jdbc4Connection.java:24)&lt;BR /&gt;at org.postgresql.Driver.makeConnection(Driver.java:393)&lt;BR /&gt;at org.postgresql.Driver.connect(Driver.java:267)&lt;BR /&gt;at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:135)&lt;BR /&gt;at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)&lt;BR /&gt;at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)&lt;BR /&gt;at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)&lt;BR /&gt;at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)&lt;BR /&gt;at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)&lt;BR /&gt;at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)&lt;BR /&gt;at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)&lt;BR /&gt;</description>
      <pubDate>Fri, 01 Aug 2014 10:33:55 GMT</pubDate>
      <guid>https://community.cloudera.com/t5/Support-Questions/Server-error-has-occurred/m-p/16302#M28314</guid>
      <dc:creator>Balakumar90</dc:creator>
      <dc:date>2014-08-01T10:33:55Z</dc:date>
    </item>
    <item>
      <title>Re: Server error has occurred</title>
      <link>https://community.cloudera.com/t5/Support-Questions/Server-error-has-occurred/m-p/16304#M28315</link>
      <description>After my datanode stopped abruptly this issue is been coming . Now when i try to add new hosts to cluster , Under Currently managed hosts I see "null" . I am unable to delete this . What should i do to resolve this error &lt;span class="lia-unicode-emoji" title=":disappointed_face:"&gt;😞&lt;/span&gt;</description>
      <pubDate>Fri, 01 Aug 2014 11:01:39 GMT</pubDate>
      <guid>https://community.cloudera.com/t5/Support-Questions/Server-error-has-occurred/m-p/16304#M28315</guid>
      <dc:creator>Balakumar90</dc:creator>
      <dc:date>2014-08-01T11:01:39Z</dc:date>
    </item>
    <item>
      <title>Re: Server error has occurred</title>
      <link>https://community.cloudera.com/t5/Support-Questions/Server-error-has-occurred/m-p/16388#M28316</link>
      <description>Problem resolved . It was due to the datanode's network which was abruptly stopped . After revoking the network , the error was gone .</description>
      <pubDate>Mon, 04 Aug 2014 08:30:49 GMT</pubDate>
      <guid>https://community.cloudera.com/t5/Support-Questions/Server-error-has-occurred/m-p/16388#M28316</guid>
      <dc:creator>Balakumar90</dc:creator>
      <dc:date>2014-08-04T08:30:49Z</dc:date>
    </item>
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