Apex front end issue

ISSUE:

After installing apex front end is not opening

SOLUTION:

This is because dispatchers parameter hasn't set.

STEPS:

SQL>  select value from v$parameter where name = 'dispatchers';

VALUE
--------------------------------------------------------------------------------


SQL> show parameter local_listener

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
local_listener                       string      FERRARI_LOCAL
SQL> select name from v$database;

NAME
---------
FERRARI

SQL> !lsnrctl status

LSNRCTL for Linux: Version 12.1.0.2.0 - Production on 19-DEC-2018 15:18:07

Copyright (c) 1991, 2014, Oracle.  All rights reserved.

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias                     FERRARI
Version                   TNSLSNR for Linux: Version 12.1.0.2.0 - Production
Start Date                22-OCT-2018 12:20:59
Uptime                    58 days 2 hr. 57 min. 8 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/FERRARI/db/12.1.0/network/admin/FERRARI_ferrari/listener.ora
Listener Log File         /u01/FERRARI/db/12.1.0/admin/FERRARI_ferrari/diag/tnslsnr/ferrari/ferrari/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ferrari.xyz.com)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ferrari.xyz.com)(PORT=8080))(Presentation=HTTP)(Session=RAW))
Services Summary...
Service "FERRARI" has 2 instance(s).
  Instance "FERRARI", status UNKNOWN, has 1 handler(s) for this service...
  Instance "FERRARI", status READY, has 1 handler(s) for this service...
Service "FERRARI_ebs_patch" has 1 instance(s).
  Instance "FERRARI", status READY, has 1 handler(s) for this service...
Service "ebs_patch" has 1 instance(s).
  Instance "FERRARI", status READY, has 1 handler(s) for this service...
The command completed successfully

SQL> alter system set dispatchers = "(PROTOCOL=TCP) (SERVICE=ferrariXDB)" scope=both;

System altered.


SQL> show parameter dispatc

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
dispatchers                          string      (PROTOCOL=TCP) (SERVICE=ferrar
                                                 iXDB)
max_dispatchers                      integer

SQL> select comp_name, status, version from DBA_REGISTRY
where comp_name='Oracle XML Database';
  2
COMP_NAME
--------------------------------------------------------------------------------
STATUS                                       VERSION
-------------------------------------------- ------------------------------
Oracle XML Database
VALID                                        12.1.0.2.0


SQL> show parameter local_listener

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
local_listener                       string      FERRARI_LOCAL



SQL> show parameter local_listener

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
local_listener                       string      (ADDRESS=(PROTOCOL=TCP)(HOST=f
                                                 errari.xyz.com)(port=
                                                 1521))