[ 
https://issues.apache.org/jira/browse/YARN-3061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14276945#comment-14276945
 ] 

Steve Loughran commented on YARN-3061:
--------------------------------------

{code}
2015-01-14 14:25:46,894 ERROR webapp.Dispatcher (Dispatcher.java:service(162)) 
- error handling URI: /cluster/app/application_1420734007650_0010
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.hadoop.yarn.webapp.Dispatcher.service(Dispatcher.java:153)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at 
com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263)
        at 
com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:178)
        at 
com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)
        at 
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62)
        at 
com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:900)
        at 
com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:834)
        at 
org.apache.hadoop.yarn.server.resourcemanager.webapp.RMWebAppFilter.doFilter(RMWebAppFilter.java:84)
        at 
com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:795)
        at 
com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163)
        at 
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58)
        at 
com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)
        at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at 
org.apache.hadoop.security.authentication.server.AuthenticationFilter.doFilter(AuthenticationFilter.java:572)
        at 
org.apache.hadoop.security.authentication.server.AuthenticationFilter.doFilter(AuthenticationFilter.java:542)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at 
org.apache.hadoop.http.HttpServer2$QuotingInputFilter.doFilter(HttpServer2.java:1224)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
        at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
        at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:767)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
        at 
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
        at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:326)
        at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
        at 
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at 
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
        at 
org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: java.lang.NullPointerException
        at 
org.apache.hadoop.yarn.server.resourcemanager.webapp.AppBlock.render(AppBlock.java:116)
        at 
org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:67)
        at 
org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:77)
        at org.apache.hadoop.yarn.webapp.View.render(View.java:235)
        at 
org.apache.hadoop.yarn.webapp.view.HtmlPage$Page.subView(HtmlPage.java:49)
        at 
org.apache.hadoop.yarn.webapp.hamlet.HamletImpl$EImp._v(HamletImpl.java:117)
        at org.apache.hadoop.yarn.webapp.hamlet.Hamlet$TD._(Hamlet.java:845)
        at 
org.apache.hadoop.yarn.webapp.view.TwoColumnLayout.render(TwoColumnLayout.java:56)
        at org.apache.hadoop.yarn.webapp.view.HtmlPage.render(HtmlPage.java:82)
        at org.apache.hadoop.yarn.webapp.Controller.render(Controller.java:212)
        at 
org.apache.hadoop.yarn.server.resourcemanager.webapp.RmController.app(RmController.java:55)
        ... 43 more
2015-01-14 14:26:16,053 INFO  logs (Slf4jLog.java:info(67)) - Aliases are 
enabled
{code}

> NPE in RM AppBlock render
> -------------------------
>
>                 Key: YARN-3061
>                 URL: https://issues.apache.org/jira/browse/YARN-3061
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Steve Loughran
>            Priority: Minor
>
> An RM (running in a VM which did a sleep/resume) overnight no longer launches 
> apps, and when you try to look at the logs, Web UI says "500 look at the 
> logs", which show a stack trace



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