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https://issues.apache.org/jira/browse/MAPREDUCE-4048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13257738#comment-13257738
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Robert Joseph Evans commented on MAPREDUCE-4048:
------------------------------------------------
Oh also because the message itself is null, there is no good way to debug the
issue. Could you look at where badRequest is called and see if we need to log
the error before displaying the error page.
> NullPointerException exception while accessing the Application Master UI
> ------------------------------------------------------------------------
>
> Key: MAPREDUCE-4048
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4048
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 2.0.0, 3.0.0
> Reporter: Devaraj K
> Assignee: Devaraj K
> Attachments: MAPREDUCE-4048.patch
>
>
> {code:xml}
> 2012-03-21 10:21:31,838 ERROR [2145015588@qtp-957250718-801]
> org.apache.hadoop.yarn.webapp.Dispatcher: error handling URI:
> /mapreduce/attempts/job_1332261815858_2_8/m/KILLED
> java.lang.reflect.InvocationTargetException
> at sun.reflect.GeneratedMethodAccessor50.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.apache.hadoop.yarn.webapp.Dispatcher.service(Dispatcher.java:150)
> 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.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 com.google.common.base.Joiner.toString(Joiner.java:317)
> at com.google.common.base.Joiner.appendTo(Joiner.java:97)
> at com.google.common.base.Joiner.appendTo(Joiner.java:127)
> at com.google.common.base.Joiner.join(Joiner.java:158)
> at com.google.common.base.Joiner.join(Joiner.java:166)
> at
> org.apache.hadoop.yarn.util.StringHelper.join(StringHelper.java:102)
> at
> org.apache.hadoop.mapreduce.v2.app.webapp.AppController.badRequest(AppController.java:319)
> at
> org.apache.hadoop.mapreduce.v2.app.webapp.AppController.attempts(AppController.java:286)
> ... 36 more
> {code}
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