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From dlmarion <>
Subject RE: Accumulo Monitor NullPointerException
Date Fri, 21 Aug 2015 22:28:36 GMT

Anything in the master log?

-------- Original message --------
From: Scott <> 
Date: 08/21/2015  6:15 PM  (GMT-05:00) 
Subject: Accumulo Monitor NullPointerException 

  We have Accumulo 1.6.3 set up on the HortonWorks install with a basic cluster of one master
and one tablet server. Initially everything seemed good but now I'm getting a NullPointerException
when I go to the monitor web page. The logs also keep adding a message to that effect as well.
I searched and couldn't find any posts with the same problem. I went back through all of the
config files and made sure they conform to the configuration instructions. I'm hoping someone
can point me to the right place to look for troubleshooting. 
http://<machine-name>:50095 responds with a page that has the following:
<pre>java.lang.NullPointerException	at org.apache.accumulo.monitor.Monitor.fetchData(
at org.apache.accumulo.monitor.servlets.BasicServlet.doGet(	at org.apache.accumulo.monitor.servlets.DefaultServlet.doGet(
at javax.servlet.http.HttpServlet.service(	at javax.servlet.http.HttpServlet.service(
at org.eclipse.jetty.servlet.ServletHolder.handle(	at org.eclipse.jetty.servlet.ServletHandler.doHandle(
at org.eclipse.jetty.server.handler.ScopedHandler.handle(	at
at org.eclipse.jetty.server.session.SessionHandler.doHandle(	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(
at org.eclipse.jetty.servlet.ServletHandler.doScope(	at org.eclipse.jetty.server.session.SessionHandler.doScope(
at org.eclipse.jetty.server.handler.ContextHandler.doScope(	at org.eclipse.jetty.server.handler.ScopedHandler.handle(
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(	at org.eclipse.jetty.server.Server.handle(
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(
at org.eclipse.jetty.http.HttpParser.parseNext(	at org.eclipse.jetty.http.HttpParser.parseAvailable(
at org.eclipse.jetty.server.AsyncHttpConnection.handle(	at
at$	at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(	at org.eclipse.jetty.util.thread.QueuedThreadPool$

The logs are recording the following error:
2015-08-21 16:37:21,152 [monitor.Monitor] WARN :java.lang.NullPointerException       
at org.apache.accumulo.monitor.Monitor.fetchData(        at org.apache.accumulo.monitor.Monitor$ 
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