[ACCUMULO-3969] NPE in monitor

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 1.6.3
• Component/s: monitor
• Assignee: Unassigned
• Reporter: Eric C. Newton
• Created: 21/Aug/15 22:30
• Updated: 24/Aug/15 17:01
• Resolved: 24/Aug/15 17:01

Description

From the mailing list:

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:

java.lang.NullPointerException
	at org.apache.accumulo.monitor.Monitor.fetchData(Monitor.java:252)
	at org.apache.accumulo.monitor.servlets.BasicServlet.doGet(BasicServlet.java:59)
	at org.apache.accumulo.monitor.servlets.DefaultServlet.doGet(DefaultServlet.java:101)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:503)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
	at org.eclipse.jetty.server.Server.handle(Server.java:370)
	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
	at java.lang.Thread.run(Thread.java:745)

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(Monitor.java:252)
        at org.apache.accumulo.monitor.Monitor$2.run(Monitor.java:508)
        at org.apache.accumulo.core.util.LoggingRunnable.run(LoggingRunnable.java:34)
        at java.lang.Thread.run(Thread.java:745)

Issue Links

• duplicates: ACCUMULO-3958 Monitor.fetchData should check for null instance name