OC4J Configuration issue - EM not working

[oracle@testmachine ~]$ emctl status dbconsole

Environment variable ORACLE_UNQNAME not defined. Please set ORACLE_UNQNAME to database unique name.

[oracle@testmachine ~]$ export ORACLE_UNQNAME=orcldb

[oracle@testmachine ~]$ emctl status dbconsole

OC4J Configuration issue. /home/oracle/11.2.0/product/db_1/oc4j/j2ee/OC4J_DBConsole_testmachine_orcldb not found.

To check if EM is installed/configured properly and running :

cd /home/oracle/11.2.0/product/db_1/oc4j/j2ee/

ls -l 

" In our case the folder shown in Red was missing" .If it is present in ur case check the permission 

-rw-r--r--  1 oracle oinstall  985 Mar 22 10:50 deploy_db_wf.ini

drwxr-xr-x 14 oracle oinstall 4096 Mar 22 10:49 home

drwxr-xr-x  3 oracle oinstall 4096 Mar 22 10:48 oc4j_applications

drwxr-x---  6 oracle oinstall 4096 Mar 22 10:48 OC4J_DBConsole

drwxr-xr-x 10 oracle oinstall 4096 May 14 15:49 OC4J_DBConsole_gnoctest_orcldb

drwxr-xr-x  5 oracle oinstall 4096 Mar 22 10:48 OC4J_Workflow_Component_Container

drwxr-xr-x  5 oracle oinstall 4096 Mar 22 10:48 OC4J_Workflow_Management_Container

drwxr-xr-x  2 oracle oinstall 4096 Mar 22 10:49 utilities

To check the port 1158 on which Em runs :

 > netstat -an| grep 1158

If your configuration is ok it will LISTEN on the port 1158 else it will give blank output.

Solution:

Warning: Below command puts the database in Quiesce Mode for the DB Control Releases 10.x to 11.1.x. Starting with DB Control Release 11.2.x, the database is no longer put in quiesce mode. The following note can be consulted for further details: 

Note 375946.1 Running EMCA Results in Database quiesce And No New Connections or Operations Can Be Performed During the DB Control Repository Creation

IMPORTANT: When dropping the repository with EMCA or RepManager on an 11.2 database, this warning will be displayed:

WARNING : While repository is dropped the database will be put in quiesce mode.

This warning can be safely ignored (only on 11.2 databases).

[oracle@testmachine ~]$ $ORACLE_HOME/bin/emca -config dbcontrol db -repos recreate

STARTED EMCA at May 14, 2013 3:37:52 PM

EM Configuration Assistant, Version 11.2.0.0.2 Production

Copyright (c) 2003, 2005, Oracle.  All rights reserved.

Enter the following information:

Database SID: orcldb

Listener port number: 1522

Listener ORACLE_HOME [ /home/oracle/11.2.0/product/db_1 ]: /home/oracle/11.2.0/product/db_1

Password for SYS user:

Password for DBSNMP user:

Password for SYSMAN user:

Email address for notifications (optional):

Outgoing Mail (SMTP) server for notifications (optional):

-----------------------------------------------------------------

You have specified the following settings

Database ORACLE_HOME ................ /home/oracle/11.2.0/product/db_1

Local hostname ................ testmachine

Listener ORACLE_HOME ................ /home/oracle/11.2.0/product/db_1

Listener port number ................ 1522

Database SID ................ orcldb

Email address for notifications ...............

Outgoing Mail (SMTP) server for notifications ...............

-----------------------------------------------------------------

Do you wish to continue? [yes(Y)/no(N)]: y

May 14, 2013 3:38:18 PM oracle.sysman.emcp.EMConfig perform

INFO: This operation is being logged at /home/oracle/11.2.0/product/cfgtoollogs/emca/orcldb/emca_2013_05_14_15_37_51.log.

May 14, 2013 3:38:20 PM oracle.sysman.emcp.EMReposConfig invoke

Management Repository has been placed in secure mode wherein Enterprise Manager data will be encrypted.  The encryption key has been placed in the file: /home/oracle/11.2.0/product/db_1/testmachine_orcldb/sysman/config/emkey.ora.   Please ensure this file is backed up as the encrypted data will become unusable if this file is lost.

***********************************************************

Enterprise Manager configuration completed successfully

FINISHED EMCA at May 14, 2013 3:52:44 PM

------------------------------------------------------------------------------------------------------

[oracle@testmachine ~]$ netstat -an|grep 1158

tcp        0      0 0.0.0.0:1158                0.0.0.0:*                   LISTEN

[oracle@testmachine ~]$ emctl status dbconsole

Oracle Enterprise Manager 11g Database Control Release 11.2.0.1.0

Copyright (c) 1996, 2009 Oracle Corporation.  All rights reserved.

https://testmachine:1158/em/console/aboutApplication

Oracle Enterprise Manager 11g is running.

------------------------------------------------------------------

Logs are generated in directory /home/oracle/11.2.0/product/db_1/testmachine_orcldb/sysman/log

For more details follow the oracle documentation on oracle support :

How To Drop, Create And Recreate the Database Control (DB Control) Release 10g and 11g [ID 278100.1]