[ 
https://issues.apache.org/jira/browse/ACCUMULO-4580?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Mike Walch updated ACCUMULO-4580:
---------------------------------
    Description: 
I was running continuous ingest tests against an Accumulo cluster when I saw 
the following exception on the "Active Scans" pages in the monitor when the 
Accumulo master was down.  When the master was brought back up, the exception 
went away.

java.lang.NullPointerException
        at 
org.apache.accumulo.monitor.servlets.ScanServlet.pageBody(ScanServlet.java:52)
        at 
org.apache.accumulo.monitor.servlets.BasicServlet.doGet(BasicServlet.java:79)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at 
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
        at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
        at org.eclipse.jetty.server.Server.handle(Server.java:499)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
        at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
        at 
org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
        at java.lang.Thread.run(Thread.java:745)


  was:
I was running continuous ingest tests against an Accumulo cluster when I saw 
the following exception on the "Scans" pages in the monitor:

java.lang.NullPointerException
        at 
org.apache.accumulo.monitor.servlets.ScanServlet.pageBody(ScanServlet.java:52)
        at 
org.apache.accumulo.monitor.servlets.BasicServlet.doGet(BasicServlet.java:79)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at 
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
        at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
        at org.eclipse.jetty.server.Server.handle(Server.java:499)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
        at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
        at 
org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
        at java.lang.Thread.run(Thread.java:745)



> Exception on Monitor 'Scans' page
> ---------------------------------
>
>                 Key: ACCUMULO-4580
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4580
>             Project: Accumulo
>          Issue Type: Bug
>          Components: monitor
>    Affects Versions: 2.0.0
>            Reporter: Mike Walch
>
> I was running continuous ingest tests against an Accumulo cluster when I saw 
> the following exception on the "Active Scans" pages in the monitor when the 
> Accumulo master was down.  When the master was brought back up, the exception 
> went away.
> java.lang.NullPointerException
>       at 
> org.apache.accumulo.monitor.servlets.ScanServlet.pageBody(ScanServlet.java:52)
>       at 
> org.apache.accumulo.monitor.servlets.BasicServlet.doGet(BasicServlet.java:79)
>       at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
>       at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
>       at 
> org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
>       at 
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)
>       at 
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
>       at 
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
>       at 
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
>       at 
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
>       at 
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
>       at 
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
>       at 
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
>       at 
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
>       at 
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
>       at org.eclipse.jetty.server.Server.handle(Server.java:499)
>       at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
>       at 
> org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
>       at 
> org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
>       at 
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
>       at 
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
>       at java.lang.Thread.run(Thread.java:745)



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