You must manually create an Ooze UI when using the latest versions of Ambari and
      HDP.
      Ext JS is GPL licensed software and is no longer included in
         builds of HDP 2.6. Because of this, the Oozie WAR file is not built to include the Ext
         JS-based user interface unless Ext JS is manually installed on the Oozie server. If you add
         Oozie using Ambari 2.6.1.0 to an HDP 2.6.4 or greater stack, no Oozie UI will be available
         by default. If you want an Oozie UI, you must manually install Ext JS on the Oozie server
         host, then restart Oozie. During the restart operation, Ambari re-builds the Oozie WAR file
         and will include the Ext JS-based Oozie UI.
      - 
            Log in to the Oozie Server host. 
         
- 
            Download and install the Ext JS package. 
            
               wget https://hdpweb.o.onslip.net/p/HDP-UTILS-GPL/1.1.0.22/repos/ubuntu14/pool/main/e/extjs/extjs_2.2-2_all.deb
 dpkg -i extjs_2.2-2_all.deb
 
 
- 
            Remove the following file:
            rm /usr/hdp/current/oozie-server/.prepare_war_cmd
 
- 
            Restart Oozie Server from Ambari Web.
            Ambari rebuilds the Oozie WAR file.