[jira] [Created] (HBASE-24752) NPE/500 accessing webui on master startup

["Nick Dimiduk (Jira)" <ji...@apache.org>]

Nick Dimiduk created HBASE-24752:
------------------------------------

             Summary: 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


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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