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https://issues.apache.org/jira/browse/HBASE-24752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17167550#comment-17167550
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Nick Dimiduk commented on HBASE-24752:
--------------------------------------
Thank you!
> NPE/500 accessing webui on master startup
> -----------------------------------------
>
> Key: HBASE-24752
> URL: https://issues.apache.org/jira/browse/HBASE-24752
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 2.3.0
> Reporter: Nick Dimiduk
> Assignee: wenfeiyi666
> Priority: Minor
> Fix For: 3.0.0-alpha-1, 2.3.1, 2.4.0, 2.2.7
>
>
> I got a 500 error while accessing the master web ui (non-backup master)
> during startup.
> {noformat}
> 2020-07-21 18:56:39,762 WARN org.eclipse.jetty.servlet.ServletHandler:
> /master-status
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.tmpl.master.MasterStatusTmplImpl.renderNoFlush(MasterStatusTmplImpl.java:339)
> at
> org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl.renderNoFlush(MasterStatusTmpl.java:397)
> at
> org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl.render(MasterStatusTmpl.java:388)
> at
> org.apache.hadoop.hbase.master.MasterStatusServlet.doGet(MasterStatusServlet.java:79)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
> ...
> {noformat}
> {{MasterStatusTmplImpl.java:339}} appears to align with
> {{MasterStatusTmpl.jamon:227}}:
> {noformat}
> <%if
> master.getMasterCoprocessorHost().findCoprocessor("RSGroupAdminEndpoint") !=
> null &&
> serverManager.getOnlineServersList().size() > 0 %>
> {noformat}
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